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Nudibranch

Nudibranchs, commonly known as sea slugs, are a diverse order of shell-less marine gastropod mollusks within the clade Heterobranchia, characterized by their soft bodies, external gills (from which their name derives, meaning "naked gills"), and lack of a mantle cavity.^[1]^[2] Over 3,000 species have been described, exhibiting remarkable morphological variety, from elongated forms with cerata (finger-like dorsal appendages) to more rounded shapes, often adorned with vibrant, aposematic coloration that serves as a warning to predators.^[3] These colors, ranging from brilliant blues and yellows to reds and whites, result from pigments or structural elements and can facilitate camouflage, mimicry, or signaling of toxicity.^[3]^[4] Nudibranchs inhabit a wide array of marine environments worldwide, from polar seas to tropical reefs, and from intertidal zones to depths exceeding 4,000 meters, including some pelagic species in the deep sea.^[5] Predominantly carnivorous, they feed on a variety of organisms including sponges, anemones, hydroids, bryozoans, and tunicates, with diet often influencing their coloration and defenses through bioaccumulation.^[6] A key notable feature is their defensive strategies: many species produce or sequester toxic chemicals from their prey, while aeolid nudibranchs specifically incorporate undischarged nematocysts (stinging cells) from cnidarian prey into their cerata for use against predators.^[4]^[7] This kleptocnidy, as it is termed, exemplifies their evolutionary adaptations for survival in predator-rich ecosystems.^[8] Nudibranchs are simultaneous hermaphrodites, laying eggs in distinctive ribbons, and their larval stages typically undergo planktonic development before settling as juveniles.^[9] Their biodiversity and ecological roles make them subjects of ongoing research in marine biology, particularly regarding chemical ecology and climate-driven range shifts.^[10]

Taxonomy and classification

Historical taxonomy

The classification of nudibranchs originated in the early 19th century when Georges Cuvier established the order Nudibranchia in 1817, positioning it as a suborder within the Opisthobranchia, a group of shell-less or internally shelled gastropods characterized by a detorted visceral nerve loop.^[11] Jean-Baptiste Lamarck maintained Cuvier's taxon in 1819 but renamed it Les Tritoniens, emphasizing their exposed gills and lack of a shell, while integrating them into the broader Opisthobranchia framework as marine mollusks with posterior gills.^[12] In the 20th century, Johannes Thiele advanced this system in his 1931 Handbuch der systematischen Weichtierkunde, organizing Nudibranchia into a hierarchy of suborders including Doridina, Dendronotina, Arminacea, and Aeolidina, primarily based on external and internal morphological variations in respiratory and defensive structures. These divisions relied on key diagnostic traits such as the presence or absence of the ctenidium (a feathery gill plume enclosed in the mantle cavity), the development of the notum (the expanded dorsal mantle surface), and radula structure (the ribbon-like feeding apparatus with specific tooth arrangements). For instance, Doridina were distinguished by a prominent ctenidium for respiration and a smooth notum without cerata (finger-like dorsal projections), whereas Dendronotina featured branched cerata or gills for oxygen exchange, and Arminacea showed reduced or absent ctenidia with specialized radulae adapted for sponge feeding.^[13] By the late 20th century, these traditional morphological groupings had recognized approximately 2,000 to 3,000 nudibranch species worldwide, reflecting extensive descriptive work on their diverse forms across marine habitats.^[14] This system, while foundational, began to shift with the advent of DNA-based phylogenies in the 1990s and 2000s.

Modern phylogenetic understanding

Modern phylogenetic analyses, primarily driven by molecular data such as 18S rRNA and mitochondrial DNA sequences from studies in the 2000s, position nudibranchs as a monophyletic clade within the Euthyneura subgroup of Heterobranchia. These investigations reveal nudibranchs as sister to other euthyneuran lineages, including pulmonates and cephalaspideans, challenging earlier assumptions of broader opisthobranch relationships. For instance, sequence data from 18S rDNA, 16S rDNA, and cytochrome c oxidase subunit I (cox1) confirm the distinct evolutionary trajectory of nudibranchs, emphasizing shared genetic markers like euthyneuran-specific gene arrangements in mitochondrial genomes.^[15]^[16] Key revisions to nudibranch classification stem from the recognition that the traditional taxon Opisthobranchia is paraphyletic, incorporating disparate heterobranch groups without reflecting true evolutionary affinities. Morphological and molecular syntheses, notably by Wägele and Klussmann-Kolb (2005), dissolve Opisthobranchia and redefine nudibranchs into major clades: Anthobranchia (encompassing dorid-like forms with branched gills) and Dexiarchia (including aeolid-like taxa with cerata). Nudibranchia sensu stricto is further delineated as the shell-less core group, excluding pleurobranchs, based on over 100 anatomical characters corroborated by early genetic data. These shifts overturned traditional groupings reliant solely on shell reduction and gill morphology.^[17] In the 2020s, phylogenomic approaches utilizing transcriptomics and whole-genome data have refined these relationships, estimating approximately 3,000 described nudibranch species and prompting the description or revision of families like Madrellidae within Dexiarchia.^[11] These studies employ large-scale datasets, such as concatenated amino acid alignments from hundreds of genes, to resolve deep divergences and highlight cryptic diversity in marine habitats. For example, mitogenomic analyses of multiple dorid and cladobranch species underscore the robustness of these clades while identifying new lineages through increased taxon sampling. Recent discoveries, such as new deep-sea species described in 2024 and 2025, further illustrate ongoing biodiversity revelations, with proposals in 2025 to reinstate suborders like Arminacea and Aeolidacea within Dexiarchia.^[18]^[19]^[20]^[21] Ongoing debates center on the monophyly of Doridoidea, generally supported as a cohesive group within Anthobranchia by molecular evidence, contrasted with polyphyly observed in some aeolid-like forms where traditional families like Flabellinidae fragment into multiple independent lineages. Transcriptomic phylogenies reveal that cerata-bearing taxa, once lumped together, represent convergent adaptations rather than shared ancestry, necessitating further integrative taxonomy to clarify these relationships.^[22]^[23]

Morphology and anatomy

External features

Nudibranchs exhibit a distinctive body plan characterized by a soft, elongated, shell-less form with bilateral symmetry, setting them apart from shelled gastropods.^[24] The mantle, which in other mollusks forms a protective covering, is greatly reduced and expanded dorsally into a notum that forms the upper surface of the body, providing flexibility and exposure for sensory and respiratory structures.^[24] This streamlined design facilitates their benthic crawling lifestyle while allowing for diverse morphological adaptations across species. A prominent external feature in many nudibranchs, particularly cladobranchs, is the cerata—dorsal, finger-like projections arranged in rows or clusters along the back.^[25] These structures serve dual roles in defense, often housing nematocysts stolen from cnidarian prey for stinging capabilities, and in respiration through vascular extensions that supplement gill function.^[25] In aeolids, a subgroup of cladobranchs, cerata are numerous and may contain branches of the digestive gland, aiding in prey processing, while their arrangement varies from simple clusters to complex, branched formations depending on the taxon.^[25] The head region features paired rhinophores, club-shaped or lamellate chemosensory tentacles that detect chemical cues in the water for navigation, feeding, and mating.^[24] Their morphology varies by family; for instance, in dorids, rhinophores are often perfoliate, with leaf-like lamellae enhancing surface area for olfaction.^[26] Retractable into protective sheaths, these structures are vital for environmental interaction without compromising the animal's soft body. Oral tentacles, shorter paired appendages near the mouth, assist in tactile exploration and taste, while the foot features a broad propodial sole anteriorly that secretes mucus for adhesion and muscular waves enabling slow locomotion over substrates.^[24] Vibrant color patterns adorn the external surfaces of nudibranchs, derived from pigments such as tetrapyrroles, which produce hues like the striking blue in species such as Nembrotha kubaryana.^[27] These patterns serve functions including camouflage against matching backgrounds and aposematic warning signals to deter predators, often correlating with chemical defenses sequestered from prey.^[28] Nudibranchs display a wide size range, from diminutive species like Alderia modesta at approximately 1 mm in length to large forms such as Hexabranchus sanguineus, which can reach up to 30 cm.^[29]^[30] This variability underscores their adaptability across marine habitats, with smaller individuals often overlooked and larger ones more conspicuous due to their bold displays.

Internal structures

Nudibranchs possess a specialized digestive system adapted for their diverse diets, primarily consisting of a radula within the buccal mass for rasping and ingesting prey. The radula, a chitinous ribbon with embedded teeth, is used to scrape algae, sponges, or cnidarians, and is housed in the muscular buccal mass that facilitates feeding movements. The stomach connects to a system of digestive diverticula that branch throughout the body, including extensions into the cerata, which serve as external projections of the digestive tract in aeolid nudibranchs. The respiratory system varies between nudibranch clades. In dorid nudibranchs, the primary respiratory organ is the ctenidium, a feathery gill structure located within the branchial cavity on the dorsal posterior surface, which facilitates gas exchange with surrounding seawater. Aeolid nudibranchs, lacking a prominent ctenidium, rely on secondary respiration through the vascularization of their cerata, where blood vessels ramify extensively to oxygenate hemolymph across the body surface.^[31] Circulation in nudibranchs occurs via an open system within a hemocoel, where hemolymph bathes the tissues directly after being pumped from a pericardial chamber. The heart, typically a single ventricle enclosed in the pericardium, propels hemolymph through vessels into the hemocoel. Excretion is handled by a nephridium, a tubular organ that filters waste from the pericardial fluid and expels it through a nephridiopore near the mantle margin.^[32]^[33] The nervous system is concentrated in the anterior region, forming a circumesophageal nerve ring with fused ganglia that integrate sensory and motor functions. Major ganglia include the cerebral, pedal, pleural, and buccal pairs, often interconnected and positioned near the head for coordinated responses. Eyes, simple cup-shaped structures with retinas, are located at the base of the rhinophores and serve primarily for light detection and basic orientation rather than image formation.^[34] Nudibranchs are simultaneous hermaphrodites, with a complex reproductive system featuring a shared hermaphroditic gonad producing both oocytes and sperm. The system includes a prostate gland for seminal fluid production along the vas deferens, an oviduct for egg transport within the female gland complex, and a seminal receptacle for storing received sperm. Eggs are fertilized internally and encapsulated into gelatinous strings or ribbons, which are extruded through the gonopore and laid in coiled masses on substrates to protect developing embryos.^[35]^[36]

Habitat and distribution

Global range

Nudibranchs are exclusively marine gastropods, inhabiting oceans worldwide from polar regions such as the Arctic and Antarctic to tropical waters, with no verified occurrence in truly freshwater environments, though some related heterobranch sea slugs like those in the genus Onchidium (family Onchidiidae) tolerate brackish conditions in estuarine or intertidal zones.^[37]^[38] Their global distribution spans all major ocean basins, including the Atlantic, Pacific, Indian, and Southern Oceans, reflecting their adaptability to diverse salinity and temperature regimes within marine ecosystems.^[39] Species richness follows a pronounced latitudinal diversity gradient, with the highest concentrations in the tropical Indo-Pacific region, where nearly 2,000 species have been documented across its waters, including significant assemblages in Australian coastal areas.^[40] This hotspot accounts for a substantial portion of the approximately 3,000 known nudibranch species globally, driven by the region's complex reef systems and stable environmental conditions that support speciation.^[39] In terms of depth, nudibranchs occupy a broad vertical range from intertidal zones exposed to air at low tide to abyssal depths exceeding 4,000 meters, though the majority of species and highest diversity occur in shallow subtidal waters up to 50 meters, particularly on coral reefs and rocky substrates.^[5] Patterns of endemism are notable in isolated regions, such as the Hawaiian Islands, where species like the gold lace nudibranch (Halgerda terramtuentis) are restricted to the main archipelago, contributing to local biodiversity uniqueness.^[41] Conversely, human-mediated dispersal via shipping has facilitated invasive expansions, exemplified by Godiva quadricolor, originally from the Indo-Pacific, which has established populations in the Mediterranean Sea through ballast water transport and hull fouling.^[42]

Preferred environments

Nudibranchs primarily inhabit marine environments characterized by structured substrates that provide shelter and food sources, such as rocky reefs, seagrass beds, and coral rubble. Some species also occupy soft sediments or kelp forests, where they can forage effectively while avoiding predation. These habitats offer a mix of biotic elements like algae and sessile invertebrates, alongside abiotic features including crevices for refuge and currents that deliver nutrients.^[43]^[44]^[45] Optimal water conditions for most nudibranchs include salinities ranging from 30 to 35 parts per thousand (ppt) and temperatures between 5°C and 30°C, spanning temperate to tropical regions. They exhibit sensitivity to environmental stressors such as pollution and low oxygen levels (hypoxia), which can disrupt their metabolic processes and reduce population viability in affected areas. These parameters align with stable coastal and shelf ecosystems, where fluctuations beyond these ranges—such as in hypersaline lagoons—limit distribution.^[46]^[47]^[48] Microhabitat preferences vary by nudibranch group, reflecting their dietary specializations. Dorid nudibranchs often associate with sponges and algae, crawling over these substrates to feed and camouflage themselves through crypsis. Aeolid nudibranchs, in contrast, frequent hydroid colonies, where they prey on these cnidarians and sequester stinging cells for defense. Pelagic species, such as the aeolid Glaucus atlanticus, inhabit open ocean surface waters, floating via air bubbles and preying on floating hydrozoans.^[49]^[50]^[51]^[52]^[53]^[54] Nudibranchs occupy diverse vertical zones, from intertidal pools to deep-sea realms, with adaptations suited to each. Intertidal species resist desiccation during low tides through copious mucus secretion, which maintains hydration and deters predators. In deeper waters, some nudibranchs exhibit bioluminescence, a adaptation that aids in communication or predator deterrence in the dark, aphotic zones below 1,000 meters. These zonation patterns are influenced by global oceanographic currents that connect suitable local environments.^[55]^[56]^[5]^[57]

Life cycle and reproduction

Mating and fertilization

Nudibranchs are simultaneous hermaphrodites, possessing both male and female reproductive organs that function concurrently in adults.^[58] This allows for mutual insemination during mating, where partners exchange sperm reciprocally without distinct male or female roles.^[59] In many species, such as those in the family Chromodorididae, mating involves protrusible penes that are inserted into the partner's gonoduct for direct sperm transfer.^[60] Some chromodorids, including Chromodoris reticulata, exhibit hypodermic insemination, where the penis pierces the partner's body wall to inject sperm directly into the hemocoel, bypassing the genital opening; the penis is often autotomized after use and regenerates within 24 hours.^[61] Courtship behaviors facilitate mate location and synchronization, often involving chemical cues detected by rhinophores and tactile interactions.^[62] Pheromones released by potential mates attract individuals, leading to physical contact and alignment.^[63] In species like the opalescent nudibranch Hermissenda opalescens, courtship includes "chaining" or following, where individuals form linear groups, with the leading animal acting primarily as the female and trailing ones as males, promoting mass spawning events.^[64] Tactile stimulation, such as nuzzling or circling, precedes copulation and ensures reciprocal insemination.^[65] Fertilization is internal, with exchanged sperm stored in specialized receptacles like the spermatheca or ovisperm duct for later use in fertilizing eggs.^[66] Sperm storage allows delayed egg laying, sometimes weeks to months after mating, and supports multiple spawnings from a single insemination.^[67] Self-fertilization is not documented in nudibranchs and is considered unlikely due to anatomical barriers and behavioral preferences for outcrossing.^[58] In species like Rostanga pulchra, mating involves aggressive darting of the penis toward the partner to establish insemination roles, highlighting sex role flexibility.^[68]

Development and metamorphosis

Nudibranchs typically deposit their eggs in gelatinous masses following internal fertilization during mating. These egg masses vary in form, often appearing as coiled ribbons or spirals, and can exhibit striking colors such as white, pink, or orange, which may serve protective functions against predation.^[69]^[70] For instance, the dorid nudibranch Rostanga pulchra produces masses containing an average of 7,000 eggs over periods of up to 30 days in summer conditions.^[70] Embryonic development within these masses leads to the hatching of larvae, which are predominantly planktotrophic, meaning they actively feed on plankton to support growth, though some species produce lecithotrophic larvae that rely solely on yolk reserves and do not feed.^[71] The initial larval phase is a trochophore, a free-swimming form with ciliary bands for locomotion and feeding, which rapidly evolves into the veliger stage characterized by a ciliated velum for propulsion and a developing shell.^[69] In Phyllidiella nigra, for example, the trochophore transforms into a veliger around 10 days post-spawning at ambient temperatures, with the velum fully formed by day 15.^[69] The veliger stage typically lasts 1 to 6 weeks, depending on species, temperature, and food availability; in Doridella obscura, planktotrophic veligers hatch after 4 days at 25°C and remain pelagic for about 9 days, while in Janolus fuscus, the period extends to 36–41 days.^[72]^[73] Metamorphosis marks the transition from the planktonic larval phase to a benthic juvenile, triggered by specific environmental cues that signal suitable habitats. In aeolid nudibranchs, such as Hermissenda crassicornis, settlement is often induced by chemical metabolites from prey hydroids like Tubularia or Obelia species, prompting the larvae to attach to substrates.^[74]^[75] During this process, the velum is resorbed, the larval shell is lost or internalized, and adult features like rhinophores, cerata, and the foot develop, enabling crawling and prey interaction; in Rostanga pulchra, competence for metamorphosis is reached after 35–40 days in veligers at 10–15°C.^[70] However, not all nudibranchs undergo this indirect cycle; some exhibit direct development, bypassing the planktonic phase entirely and hatching as miniature benthic juveniles. For example, the onchidiid Peronia species "Minneawamochi" hatches directly without a free-swimming larva, and Cadlina laevis emerges from egg capsules after about 50 days as a fully formed juvenile.^[76]

Feeding and ecology

Dietary habits

Nudibranchs are predominantly carnivorous, preying on a diverse array of sessile marine invertebrates, with cnidarians such as hydroids and anemones forming a primary component of their diet, alongside sponges, bryozoans, and ascidians.^[77] This dietary specialization reflects their evolutionary adaptation to exploit chemically defended prey in marine environments, though detritus and microalgae occasionally supplement their intake in certain species.^[78] Feeding is facilitated by a modified radula, a chitinous ribbon-like structure used for scraping or rasping prey tissues, which varies in form across nudibranch clades to suit specific diets. Dorid nudibranchs employ an everted, protrusible pharynx to envelop and liquefy prey—often sponges—by secreting digestive enzymes externally before sucking the resulting slurry into their digestive tract.^[79] In contrast, aeolid nudibranchs utilize a labial armature, a reinforced oral structure, to penetrate hydroids or anemones, injecting enzymes to break down tissues or extracting nematocysts for later use.^[80]^[81] Many nudibranch species exhibit selective foraging, targeting particular prey taxa that match their morphological and behavioral adaptations, thereby minimizing energy expenditure in diverse habitats. For instance, species in the genus Armina specialize on sea pens, using their broad radula to consume the polyp tissues of these colonial cnidarians.^[82] While most are obligate carnivores, a few, such as Polycerella emertoni, demonstrate microherbivory by grazing on periphyton films rather than animal prey.^[83] As mid-level carnivorous predators, nudibranchs occupy key trophic positions in reef and benthic ecosystems, exerting top-down control on prey populations that influences nutrient cycling and community structure. Their predation on sponges, for example, enhances silicon recycling in coral reefs, while specialized feeders like Phestilla sibogae can decimate coral colonies, altering local biodiversity dynamics.^[84]^[85]

Symbiotic relationships

Nudibranchs engage in various mutualistic relationships with other organisms, often involving symbiotic microorganisms or host associations that enhance their survival in nutrient-limited environments. For instance, some species, such as those in the genus Rostanga, harbor bacterial symbionts derived from their sponge prey, which contribute to digestion and chemical defense by producing antimicrobial compounds.^[86] Similarly, solar-powered nudibranchs like members of the clade Aeolidida incorporate kleptoplasts or dinoflagellate symbionts (Symbiodiniaceae) from algal or cnidarian prey, enabling photosynthesis and reducing reliance on external food sources.^[87] These associations provide nudibranchs with energy supplements, while the symbionts gain mobility and protection within the host's tissues.^[88] In coral reef settings, certain nudibranchs participate in cleaning mutualisms, where they benefit from interactions with fish that remove ectoparasites, though such relationships are less common than those involving cleaner shrimp. Some dorid nudibranchs, such as Gymnodoris nigricolor, engage in parasitic associations with gobies in genera like Amblyeleotris, attaching to their fins and feeding on host tissue, which impairs goby health without reciprocal benefit.^[89] Housing within sponge hosts also exemplifies mutualism; nudibranchs like those feeding on Halichondria panicea selectively consume symbiotic zoochlorellae from the sponge, improving their own growth and reproduction rates, while dispersing the algae benefits the sponge's recovery.^[90] Commensal interactions are prevalent, with nudibranchs often serving as hosts or substrates for other species without significant reciprocal benefit or harm. Epibiosis occurs when smaller organisms colonize nudibranch cerata or mantles, such as commensal shrimp (e.g., Periclimenes species) that hitch rides on larger dorid nudibranchs for transport and protection, feeding on detritus without affecting the host.^[91] Conversely, nudibranchs themselves act as epibionts on larger invertebrates like corals or sea fans, residing on surfaces for camouflage while grazing minimally on polyps, thus neither substantially benefiting nor damaging the host.^[92] Additionally, nudibranchs frequently host parasitic copepods, such as Ismaila belciki on Janolus fuscus, where the copepod embeds in the host's tissues, impairing reproduction, growth, and survivorship without providing any advantage to the nudibranch.^[93] These endoparasites can reach high prevalence in dense populations, altering host fitness dynamics.^[94] A notable form of kleptoparasitism in nudibranchs involves aeolids stealing nematocysts from cnidarian prey for defensive purposes, extending beyond mere feeding to repurpose stolen structures. After ingesting hydroids or anemones, undischarged nematocysts are transported via cnidophage cells to the cnidosac in cerata, where they are stored and deployed against predators, sometimes more effectively than in the original host.^[95] This sequestration allows nudibranchs like Glaucus atlanticus to wield potent stinging cells from jellyfish prey, deterring attacks and enhancing survival in open water.^[96] The process involves selective ingestion and functional integration, with up to 80% of nematocysts remaining viable for discharge.^[7] Beyond direct symbioses, nudibranchs play a broader ecological role as biodiversity indicators in marine surveys, reflecting ecosystem health due to their sensitivity to environmental changes like temperature shifts and pollution. Citizen science initiatives, such as the Sea Slug Census, document species diversity and range expansions, signaling climate impacts; for example, a 210 km northward shift in California populations highlights warming effects.^[97]^[98] Their grazing also influences algal-coral dynamics by controlling competitor populations; nudibranchs preying on hydroids and turf algae prevent overgrowth that smothers corals, promoting reef resilience in disturbed habitats.^[99]

Defense mechanisms

Chemical defenses

Nudibranchs employ chemical defenses primarily through the sequestration of toxic compounds from their prey and, in some cases, the de novo biosynthesis of defensive metabolites. Sequestration involves the uptake and storage of potent toxins acquired from dietary sources, such as sponges or soft corals, which are then repurposed for protection against predators. For instance, dorid nudibranchs sequester terpenoids like scalaradial from their sponge prey. These sequestered compounds are typically stored in specialized structures: aeolid nudibranchs concentrate them in the cnidosacs within their cerata, while dorid species utilize mantle glands or dorsal follicles.^[100] In addition to sequestration, some nudibranchs synthesize defensive chemicals de novo, producing bioactive terpenes and alkaloids independently of their diet. Other examples include sesquiterpenes like those in Dendrodoris species and alkaloids such as fennebricin A in Aldisa nudibranchs, which are generated via endogenous biosynthetic pathways and stored in similar glandular structures.^[101] This dual strategy—sequestration and synthesis—allows nudibranchs to maintain a diverse chemical arsenal tailored to their ecological niches. For example, latrunculin A, sequestered from sponge prey such as Latrunculia magnifica, is found in species of the genus Chromodoris. Delivery of these defenses occurs through exudation from the skin, mucus, or specialized glands, often triggered by predator contact. In aeolids, cerata serve as both storage and release sites, ejecting toxic mucus or stinging nematocysts derived from prey. Dorids release compounds from mantle glands, creating a bitter or noxious barrier. This rapid deployment enhances survival by repelling attackers through taste aversion or toxicity. The effectiveness of these chemical defenses is amplified by aposematic coloration, where bright patterns signal unpalatability to visual predators like fish. Laboratory studies demonstrate that highly defended nudibranchs with bold, contrasting colors experience significantly reduced predation rates; for instance, experiments with wrasse fish showed learned aversions to chemically protected species, with attack rates dropping by up to 80% after initial encounters.^[102] Highly defended species also exhibit less color variability, suggesting evolutionary pressure for consistent warning signals that reliably indicate toxicity.^[103]

Physical and behavioral adaptations

Nudibranchs employ a range of structural adaptations to deter predators, notably through the sequestration of nematocysts from cnidarian prey. In aeolid nudibranchs, these stinging organelles are stored intact within specialized cnidosacs located at the tips of the cerata, dorsal appendages that serve multiple functions. When threatened, the nudibranch can evert the cnidosac, allowing the nematocysts to discharge like harpoons, delivering painful stings to attackers. This mechanism provides an effective mechanical defense, as the nematocysts remain functional post-sequestration and can be rapidly deployed.^[104] Another key structural defense is the autotomy of cerata, where these appendages are voluntarily shed as decoys to distract predators. In species such as Phidiana crassicornis and Melibe leonina, cerata detach at a pre-formed autotomy plane reinforced by sphincter muscles and connective tissue, allowing quick separation without significant harm to the main body. The severed cerata continue to wriggle, drawing attention away from the escaping nudibranch, which can regenerate the lost structures over weeks. This sacrificial strategy is particularly useful against grasping predators like crabs or fish.^[105] Behaviorally, many nudibranchs rely on cryptic camouflage to avoid detection, blending seamlessly with their substrates through color patterns and textures that mimic surrounding algae, sponges, or sediments. Species like those in the genus Hypselodoris select visually matching backgrounds to reduce visibility to visually hunting predators, enhancing survival in exposed habitats. This passive evasion is complemented by active locomotion strategies, including rapid swimming via undulating body or ceratal movements in aeolids such as Tritonia diomedea, which propel themselves away from threats using rhythmic flexions. Some dorid nudibranchs also burrow shallowly into soft sediments for concealment when disturbed.^[3]^[106]^[107] At the population level, nudibranchs participate in mimicry rings where unrelated species converge on similar warning color patterns, reinforcing collective deterrence through shared visual signals. In Müllerian mimicry complexes, such as those involving chromodorid nudibranchs with bold yellow-and-black stripes, these convergent patterns educate predators on the unpalatability of the group, reducing attacks on all members even if defenses vary. This behavioral convergence amplifies individual protection without requiring solitary action.^[108]^[109]

References

[1]
Phylum Mollusca | manoa.hawaii.edu/ExploringOurFluidEarth
The nudibranchs, or sea slugs (nudi- meaning naked, -branch meaning gill), are gastropods that don't produce a shell, so these animals are all soft-bodied (Fig.ʻOpihi in Hawaiʻi · Activity: Squid Dissection · Gastropod Shell Description
[2]
"Nudibranch Predators of Octocorallia" by Eric Brown - NSUWorks
Apr 29, 2011 · Nudibranchs are soft-bodied marine heterobranch gastropod molluscs which lack a shell and mantle cavity. The basic body plan is bilaterally ...Missing: definition | Show results with:definition
[3]
A Collage of Nudibranch Colors - Smithsonian Ocean
Nudibranchs are a kind of sea slug, and their 3000 species are found from the poles to the tropics in both shallow and deep water. Though they often only ...
[4]
[PDF] A Study of Defensive Mechanisms Employed by Two Species of ...
The term 'nudibranch' means 'naked gills' which aptly describes their appearance: unlike many of their snail-like relatives, these marine invertebrates have ...Missing: definition | Show results with:definition
[5]
[PDF] FEEDING BIOLOGY OF THE AEOLID NUDIBRANCH FLABELLINA ...
This thesis, by Rebecca A. Romano, focuses on the feeding biology of the nudibranch Flabellina verrucosa, submitted to UNH in September 2022.
[6]
https://repositories.lib.utexas.edu/server/api/cor...
The four suborders of nudibranchs can be associated with general prey preferences: Doridacea are usually associated with sponges, ectoprocts, and tunicates; ...
[7]
How Sea Slugs Steal the Defenses of Their Prey | Smithsonian Ocean
The coloration is useful for more than just a pretty photo, however. Bright colors warn predators that these nudibranchs would make a bad meal because they are ...
[8]
Movement and storage of nematocysts across development in ... - NIH
Apr 18, 2022 · Intracellular sequestration requires specialized cellular and molecular mechanisms allowing a predator to retain and use specific organelles ...
[9]
Nudibranch range shift - OEHHA - CA.gov
Aug 23, 2023 · Many marine species, including 25 nudibranchs, shifted their distributions farther north during this period.
[10]
World Register of Marine Species - Nudibranchia - WoRMS
Nudibranchia ; Classification. Biota; Animalia (Kingdom); Mollusca (Phylum); Gastropoda (Class); Heterobranchia (Subclass); Euthyneura (Infraclass); Ringipleura ...Missing: Thiele | Show results with:Thiele
[11]
(PDF) Phylogeny of the Nudibranchia - ResearchGate
Aug 10, 2025 · More than 100 morphological, anatomical and histological characters pertaining to the Nudibranchia are discussed in the course of a phylogenetic analysis.
[12]
Nudibranchia - OPK Opistobranquis
The taxonomic history of nudibranchs (Nudibranchia Cuvier, 1817) is a paradigmatic example of how marine biology has evolved from an essentially ...
[13]
Nudibranchs | National Geographic
Population. There are more than 2,000 known species of nudibranch, and new ones are being identified almost daily. They are found throughout the world's oceans ...
[14]
The phylogeny of Nudibranchia (Opisthobranchia, Gastropoda ...
The study used 18S rDNA, 16S rDNA, and cox1 sequences to confirm the monophyly of Nudibranchia and its two major groups.
[15]
The Complete Mitochondrial Genome of the Nudibranch Roboastra ...
The phylogenies of some orders of opisthobranchs (Anaspidea and Nudibranchia) based on partial sequences of nuclear 18S rRNA and mitochondrial rrnS, rrnL, and ...
[16]
than just slimy slugs. Shell reduction and its implications on defence ...
Feb 16, 2005 · Recently, Wägele reviewed potential key characters that might have enhanced radiation within the Opisthobranchia [2]. She has used a working ...
[17]
Characterization of 11 complete mitochondrial genomes ... - ZooKeys
Jul 4, 2025 · A morphological phylogeny recognized two major nudibranch groups based on the digestive system, the Anthobranchia (Doridina: Bathydoridoidea and ...
[18]
Improving the understanding of Janolidae and Madrellidae ...
Apr 10, 2019 · A new genus and species of the nudibranch family Janolidae (Mollusca; Gastropoda, Opisthobranchia) from New Zealand waters. Journal of ...
[19]
Polyphyly of the traditional family Flabellinidae affects a major group ...
It was found that the current family Flabellinidae is polyphyletic and its phylogeny and taxonomic patterns cannot be understood without considering members ...Missing: Doridoidea | Show results with:Doridoidea
[20]
(PDF) A combined phylogenetic strategy illuminates the evolution of ...
Dec 9, 2023 · ABSTRACT Goniodorididae is a family of small dorid nudibranchs distributed worldwide that feed on entoprocts, ascidians, and bryozoans.
[21]
Nudibranchs of the British Isles : Anatomy
However in Goniodorids, Polycerids and some other dorid families the mantle is progressively reduced to a ridge around the side of the body, from which pallial ...
[22]
Nudibranchs as Sources of Marine Natural Products with Antitumor ...
Cladobranchs are characterized by the presence of numerous dorsal extensions called cerata, which serve various functions including respiration, digestion, and ...<|control11|><|separator|>
[23]
Rostanga pulchra or Aldisa cooperi? - The Sea Slug Forum
Mar 30, 2006 · The rhinophores of Aldisa are perfoliate, like most dorids. Also, the dorsal surface of Rostanga is covered with numerous small papillae with ...<|control11|><|separator|>
[24]
Natural Products from Three Nudibranchs: Nembrotha kubaryana ...
We have isolated a blue tetrapyrrole from Nembrotha kubaryana, the known nakafuran-8 and -9 from Hypselodoris infucata and spongiane-16-one from Chromodoris ...
[25]
Highly defended nudibranchs “escape” to visually distinct ... - NIH
Nudibranchs mainly use chemotaxis to move around their environment to find food and mates, with visual input only relevant for basic phototaxis, such as ...
[26]
Alderia modesta, Modest alderia - SeaLifeBase
Length at first maturity / Size / Weight / Age. Maturity: Lm ? range ? - ? cm Max length : 0.1 cm TL male/unsexed; (Ref. 822). Biology Glossary (e.g. ...
[27]
Hexabranchus sanguineus, Spanish dancer : fisheries - SeaLifeBase
Length at first maturity / Size / Weight / Age. Maturity: Lm ? range ? - ? cm Max length : 25.0 cm TL male/unsexed; (Ref. 100471). Biology Glossary (e.g. ...
[28]
The Digestive Diverticula in the Carnivorous Nudibranch, Melibe ...
Diverticula (orange) emanate from the digestive system and propagate through a large portion of the animal, including the dorsal cerata (anterior most cerata ...
[29]
[PDF] \ ! Phylogeny of the Nudibranchia - ResearchGate
Lamarck (1819) maintained Cuvier's taxon but renamed it Les Tritoniens. Milne-Edwards (1848) placed it as a family ofhis Opisthobranchiata. Ferussac (1822).
[30]
Nudibranch - an overview | ScienceDirect Topics
There are two tissue layers: the epidermis, which lines the outside of the animal, and the gastrodermis, which lines the inside of the animal. These layers are ...
[31]
(PDF) Ultrastructure of the renopericardial complex of the interstitial ...
Aug 9, 2025 · The renopericardial complex of the Mollusca consists of an endothelially lined pericardium which encloses the heart, and a pair of excretory ...
[32]
Neuromuscular development of Aeolidiella stephanieae Valdéz ...
Jan 22, 2010 · Located laterally to the eyes and the cerebral ganglia are the small optical ganglia (Fig. ... nudibranch central nervous system based on ...
[33]
[PDF] Reproduction in the Hermaphrodite Aeolidiella glauca - DiVA portal
Mate choice in a hermaphroditic nudibranch – does size matter? Manuscript ... In biology hermaphrodites are specifically defined as organisms that possess a.
[34]
Can you find me? A new sponge-like nudibranch from the genus ...
Jan 13, 2023 · In this paper a sponge-like Discodoridae nudibranch Jorunna liviae sp. nov. is described. The description is based on integrative anatomy, ...Missing: scholarly | Show results with:scholarly
[35]
[PDF] Northeast Pacific Invertebrates, 5th Edition
Most species nudibranchs are marine and occur at a wide range of depths, from intertidal to over 700 m worldwide. However, a few species can be found in ...
[36]
Onch slugs (Onchidiidae) on Singapore shores - WildSingapore
Onch slugs are NOT nudibranchs! Pulmonate sea slugs such as the Onch slugs of the Family Onchidiidae breathe air through simple lungs or modified gills. Other ...
[37]
Dive Into the Exotic World of Nudibranchs, the Spectacular Slugs of ...
There are around 3,000 nudibranch species all over the world, from the Arctic to the tropics, but roughly a third of them are found in the waters off Australia.
[38]
Nudibranch and Sea Slug Identification-Indo Pacific by Gosliner ...
Aug 31, 2015 · Their new book includes identification of almost 2000 species of sea slugs from around the tropics of the Indian and Pacific Oceans.
[39]
MBARI researchers discover remarkable new swimming sea slug in ...
Nov 12, 2024 · Depth range: 1,013 to 4,009 meters (3,323 to 13,153 feet) Geographic range: currently known from the Northeastern Pacific Ocean, from Oregon ...Missing: maximum | Show results with:maximum
[40]
[PDF] Nudibranchs
DISTRIBUTION: Most species are found throughout the Hawaiian archipelago; however, the gold lace nudibranch is only found in the Main Hawaiian Islands.
[41]
First Record of Godiva quadricolor (Barnard, 1927) (Nudibranchia
Feb 8, 2025 · Reported as a non-indigenous species (NIS) in the Mediterranean Sea, it is hypothesized to be introduced via shipping and ballast water. ... In ...
[42]
[PDF] Gulf of Maine Marine Habitat Primer
Biogenic habitats such as seaweed beds, seagrass beds, salt marshes, mussel beds, and cold-water coral thickets are distinguished by high densities of structure ...
[43]
[PDF] Nudibranchia At The Edge: Benthic Diversity Across The Aquatic ...
This region's coral reefs, seagrass beds, and mangroves offer essential habitats for a wide variety of nudibranch species (Ravindran et al., 2012). The Gulf ...
[44]
Rocky Shore Animals - UO Blogs
Habitat: Often found on rocks, kelp, mud, and sponges of the intertidal and subtidal zones. Some species are pelagic. Diet: Nudibranchs are carnivores that feed ...
[45]
New records of nudibranchs and a cephalaspid from Kuwait ...
The Arabian / Persian Gulf (APG) is a shallow marginal sea with a very wide range of temperature (10–48 °C) and salinity (42–65‰) and also highly impacted by ...
[46]
(PDF) Unraveling the Sea Slug Fauna from an Extremely Variable ...
Jun 10, 2024 · Rocky tide pools are transition environments whose communities are affected by sudden temperature, salinity and nutrient fluctuations.
[47]
[PDF] IJCS-21-22_Sabdono.pdf
Nudibranchs are a prominent part of coral reef fauna that changes in their abundance and diversity due to environmental changes.
[48]
Nudibranch predation boosts sponge silicon cycling - PMC - NIH
Jan 20, 2023 · The study area is also habitat for the dorid nudibranch D. verrucosa. This spongivorous nudibranch lives from the intertidal zone to 15 m ...
[49]
(PDF) How specialized are the diets of Northeastern Pacific sponge ...
Aug 6, 2025 · Crypsis occurs in many species of sponge-eating dorids and is documented in nudibranchs from the Eastern and Indo-Pacific, the Mediterranean ...
[50]
Rostanga pulchra
This species feeds on, and is often found on, red sponges such as Acarnus,Esperiopsis,Ophlitaspongia, and Plocamia. It lays its eggs in a tight orange circle ...
[51]
Impacts associated with the recent range shift of the aeolid ...
Although facelinid nudibranchs are known to prey on hydroids and other nudibranchs, particularly aeolids (records summarized by Thompson 1964; Thompson and ...
[52]
Common as Muck, part II- the common aeolids - California Academy ...
Nov 29, 2012 · This aeolid feeds on hydroids (animals with stinging cells related to corals, jellyfish, and sea anemones) from which it acquires symbiotic ...Missing: microhabitats | Show results with:microhabitats
[53]
Blue Dragon (Glaucus atlanticus) - ANGARI Foundation
Oct 1, 2024 · The blue dragon lives a pelagic lifestyle, living on the open ocean surface and drifting along with the currents. Most nudibranchs live lower in ...
[54]
Nudibranchs out of water: long-term temporal variations in the ...
Aug 27, 2018 · In contrast to other molluscs, nudibranchs do not possess a shell that protects them from desiccation and allows them to create a high humidity ...Missing: resistance | Show results with:resistance
[55]
Perspectives on mucus secretion in reef corals
While it is widely recognised that corals produce mucus on exposure to air and that such secretions will act as protection against desiccation (Daumas &.<|separator|>
[56]
Discovery and description of a remarkable bathypelagic nudibranch ...
External morphology. There are three integral regions: the head, the body, and the tail. The head is dominated by the oral hood, which is highly elastic. In ...
[57]
Is self-fertilization possible in nudibranchs? - Oxford Academic
Jul 16, 2008 · Nudibranchs are internally fertilized simultaneous hermaphrodites with a complex reproductive system (Gosliner, 1994).
[58]
COPULATION BY HYPODERMIC INJECTION IN THE ...
Nudibranchs are hermaphroditic and normally copulate reciprocally, with the intromittant organ of one inserted in the vaginal opening of the other. P. zosterae ...Missing: mutual | Show results with:mutual
[59]
Sexual selection in a simultaneous hermaphrodite with hypodermic ...
Hypodermic injections across all sections of the body successfully transferred sperm and fertilized eggs. The function and consequences of hypodermic ...Missing: mutual | Show results with:mutual
[60]
[Invertebrate / Animal Behaviour • 2013] Disposable penis and its ...
Feb 13, 2013 · We found a peculiar mating behaviour, wherein the nudibranch autotomized its penis after each copulation and was able to copulate again within 24 h.
[61]
The rhinophores sense pheromones regulating multiple behaviors ...
Pheromones released during mating and egg laying in Aplysia facilitate various aspects of behavior. We now show that the chemosensory rhinophores sense ...Missing: courtship | Show results with:courtship
[62]
nudibranchs | The Marine Detective
Mating Great White Dorids: Reproduction of nudibranch species is always ... Nudibranchs come together to mate through being attracted by smell (pheromones).Missing: courtship | Show results with:courtship
[63]
Underwater Wonders:The Vibrant World of Nudibranchs
Aug 12, 2024 · The opalescent nudibranch engages in a mesmerizing courtship behavior known as "chaining" or "following." It begins with one nudibranch ...
[64]
The enigmatic mating behaviour and reproduction of a simultaneous ...
This study describes the mating behaviour and reproduction of the simultaneous hermaphrodite Aeolidiella glauca. Unlike other nudibranchs, A. glauca was ...
[65]
Precocious Sperm Exchange in the Simultaneously Hermaphroditic ...
Nudibranchs and other heterobranchs are typically described as simultaneous hermaphrodites with concurrently functioning male and female sex organs and ...Missing: prostate | Show results with:prostate
[66]
RUDIE NUDIES – The Mating Game - Nudibranch Domain
Apr 10, 2022 · All adult sea slugs (with very minor exceptions) are simultaneous hermaphrodites. This means they possess both male and female sexual organs at the same time.Missing: mutual | Show results with:mutual<|separator|>
[67]
Rostanga pulchra, Red sponge nudibranch - SeaLifeBase
Mating behavior: Both individuals darts their penis toward each other to induce one to act as a male and the other as the female. The victorious one to ...Missing: love- | Show results with:love-
[68]
Embryonic and larval development of the nudibranch Phyllidiella nigra
Dec 23, 2019 · At 10 days after spawning, the prevelum is transformed into the velum, and the trochophore developed into veliger stage. Between 10 to 15 days ...
[69]
Development and metamorphosis of the planktotrophic larvae of ...
Rostanga pulchra MacFarland, a small (1 to 2 cm) dorid nudibranch, lays an average of 7000 eggs in the laboratory during a period of 30 days in the summer.Missing: scientific papers
[70]
Species Selection Favors Dispersive Life Histories in Sea Slugs, but ...
Species selection favors lineages with short-lived (lecithotrophic) larvae, which are less dispersive than long-lived (planktotrophic) larvae.
[71]
https://pmc.ncbi.nlm.nih.gov/articles/PMC4794617/
[72]
Complete development of the northeast Pacific arminacean ...
Early life-history stages of the nudibranch Janolus fuscus (superfamily Arminoidea) were reared in the laboratory and collected from the field to document ...Missing: scientific papers
[73]
Competence and metamorphosis in the long-term planktotrophic ...
In the field, the nudibranch mollusc H. crassicornis has been reported to feed on hydroids such as Tubularia spp., Obelia spp., anemones, tunicates, scyphozoans ...
[74]
[PDF] chemical ecology of the settlement of benthic marine invertebrates
Fractions of aqueous extracts of the hydroid, prepared by ultrafiltra- tion, induced metamorphosis of the nudibranch larvae. Various sugars dissolved in sea ...
[75]
Direct development in a Nudibranch, Cadlina laevis, with a ...
Cadlina laevis (L.) is the first British species of nudibranch shown to possess direct development. The embryo leaves the egg-capsule approximately 50 days ...
[76]
(PDF) A Preliminary Report on a World-Wide Review of the Food of ...
Aug 6, 2025 · ... Nudibranchs have a highly diversified, mostly carnivorous diet, preying on a wide range of animal taxa, including ascidians, bryozoans, ...
[77]
A comparison of food sources of nudibranch mollusks at different ...
Nov 24, 2021 · Nudibranchs are mostly carnivorous, but detritus and microalgae may comprise some part of their diet (Ekimova, Deart & Schepetov, 2019a; ...
[78]
[PDF] The Book David A. Mullins 2023 – Diet, Feeding and Digestion
... digestive system have also evolved. ... Above; A sequence showing the suctorial feeding of the radula-less porostome nudibranch Phyllidiella pustulosa.
[79]
(PDF) Feeding mechanisms of west American nudibranchs feeding ...
Aug 7, 2025 · ... Nudibranchia are a carnivorous order of sea slugs feeding on prey such as anemones, corals, sponges, tunicates, and bryozoans (Nybakken and ...Missing: primary scholarly
[80]
Feeding and radula - OPK Opistobranquis
Many opisthobranchs have a pair of jaws, preceding the radula, which allow them to capture grazed food. Doridacean nudibranchs have a wide radular area, with ...Missing: pharynx aeolids<|separator|>
[81]
Armina californica - The Sea Slug Forum
Like most species of Armina, it lives in sand or muddy regions and feeds on sea pens, in particular Ptilosarcus gurneyi and Renilla koellikeri. It stays buried ...
[82]
Not all nudibranchs are carnivores - OPK Opistobranquis
Jul 25, 2020 · While traditionally considered carnivores, some nudibranchs, like *Polycerella emertoni*, are microherbivores, feeding on periphyton, not just ...
[83]
Nudibranch predation boosts sponge silicon cycling - Nature
Jan 20, 2023 · Sponges contribute to the recycling of nutrients to higher trophic levels through benthic-pelagic coupling and to increasing marine ...
[84]
The effect of environmental factors on spatial-temporal variation of ...
Nov 9, 2022 · The coral-feeding nudibranch, Phestilla sibogae can quickly consume all living tissue on a coral colony and cause extensive damage to coral ...
[85]
Multiple bacterial partners in symbiosis with the nudibranch mollusk ...
Jan 7, 2022 · The symbiotic association of the nudibranch Rostanga alisae with bacteria was supported by ample evidence, including an analysis of cloned bacterial 16S rRNA ...
[86]
The highly developed symbiotic system between the solar-powered ...
The striking resemblance between intracellular symbiosis in nudibranchs and corals underscores the potential value of employing nudibranchs as model organisms ...Missing: cleaning fish
[87]
Dinoflagellate diversity among nudibranchs and sponges from ...
Symbioses with the dinoflagellate Symbiodinium are widespread among marine invertebrates and protists, especially in nutritionally demanding habitats, ...Missing: Corambus | Show results with:Corambus
[88]
Nudibranch of the Week is Gymnodoris nigricolor - The Slug Site
This relationship appears to be parasitic, rather than symbiotic, as the goby derives no observable benefit at all from the dorid nudibranch. Mary Jane ...
[89]
Nudibranch-sponge feeding dynamics: Benefits of symbiont ...
Nudibranchs consuming H. panicea with symbiotic zoochlorellae had higher feeding, growth, and egg production rates than individuals eating aposymbiotic sponge.Missing: Corambus | Show results with:Corambus
[90]
HITCHIN' A RIDE ON THE SEA SLUG TRAIN | Nudibranch Domain
Mar 7, 2021 · The larger of the dorids act as host, from time to time, to certain shrimps that are fascinating to watch as they lightly move over, from side ...
[91]
Symbiosis, commensalism, mutualism and parasitism
Many sea slugs have evolved close relationships with other organisms. The simplest associations are the many nudibranchs which are permanently found on, or ...
[92]
Impacts of an endoparasitic copepod, Ismaila belciki, on ... - PubMed
Impacts of an endoparasitic copepod, Ismaila belciki, on the reproduction, growth and survivorship of its nudibranch host, Janolus fuscus. Int J Parasitol. ...
[93]
Impacts of an endoparasitic copepod, Ismaila belciki, on the ...
Examination of the impact of infection of a copepod parasite on nudibranch host. •. Experiments examine impact of infection on reproduction, growth, survival ...
[94]
Acquisition and Use of Nematocysts by Cnidarian Predators - PMC
Although toxic, physically destructive, and produced solely by cnidarians, cnidocysts are acquired, stored, and used by some predators of cnidarians.
[95]
The utilization of cnidarian nematocysts by aeolid nudibranchs
Some nudibranchs that feed on cnidarians are known to store nematocysts within cnidophage cells and use them for their own defense.Missing: kleptoparasitism | Show results with:kleptoparasitism
[96]
Sea Slug Surveys - California Academy of Sciences
Oct 25, 2012 · These surveys are also important since the number and diversity of nudibranchs is an indicator for marine ecosystem health. Nudibranchs are ...
[97]
[PDF] Indicators of Climate Change in California (2022) Nudibranch range ...
A nudibranch species is expanding its range northward along the California coast due to warming ocean conditions, with a 210 km shift since the mid-1970s.
[98]
[PDF] The dynamics of a nudibranch-hydroid predator-prey association
* Aeolid nudibranchs are often abundant in fouling communities on colonial organisms such as hydroids (Nybakken, 1978). Often in fouling communities dominated ...
[99]
Spongistatin 1 - an overview | ScienceDirect Topics
Spongistatin 1 was extracted from the brown colored Spongia sp., Spongistatin ... and a sponge feeding nudibranch, Chromodoris lochi and this lipophilic ...
[100]
Toxicity in animals. Trends in evolution? - ScienceDirect.com
Some nudibranch species also produce defensive metabolites de novo. ... Distribution and sequestration of palytoxin in coral reef animals. Toxicon ...
[101]
Nudibranchs as Sources of Marine Natural Products with Antitumor ...
Aug 3, 2025 · Nudibranchs have garnered increasing interest in biomedical research due to their complex chemical defense mechanisms, many of which are derived ...Missing: intertidal desiccation
[102]
Bioactive Compounds from Marine Heterobranchs - MDPI
In this review, we analyze the bioactivity of more than 450 compounds from ca. 400 species of heterobranch molluscs that are useful for the snails to protect ...
[103]
CERATA Part 3 – Defensive Attributes - Nudibranch Domain
Mar 22, 2022 · ... cerata contain glands that release toxic/distasteful chemicals derived or synthesised through their diet. Species of Cyerce, for example ...
[104]
Fishes learn aversions to a nudibranch's chemical defense
Jan 24, 2025 · Opisthobranch gastropods, such as nudibranchs, are well known for their secondary metabolites, which may be diet-derived (Slattery et al.Missing: synthesis | Show results with:synthesis
[105]
Chemical defences indicate bold colour patterns with reduced ... - NIH
Chemical defences indicate bold colour patterns with reduced variability in aposematic nudibranchs - PMC.
[106]
Nematocyst sequestration within the family Fionidae (Gastropoda
Cladobranch molluscs are widely known for the ability to sequester the nematocysts of their cnidarian prey, in order to store and use them to protect themselves ...
[107]
Autotomy of cerata by the nudibranch Melibe leonina (Mollusca)
Ceratal autotomy is accompanied by strong contraction of sphincter muscles flanking the autotomy plane and of longitudinal muscle bands within the ceras. Muscle ...
[108]
Highly defended nudibranchs “escape” to visually distinct ...
Nudibranchs are an intriguing system for the study of defensive animal coloration due to potent chemical defenses in many species (Avila 1995; Winters et al.
[109]
The Habits and Habitats of the Opisthobranch Molluscs of the British ...
digitata Adams & Reeve, another swimming nudibranch, was very common at Vunda. Point. This animal swims by single, violent side to side flexions of the body ...
[110]
Toxicity and taste: unequal chemical defences in a mimicry ring
Jun 6, 2018 · Mimicry of warning signals is common, and can be mutualistic when mimetic species harbour equal levels of defence (Müllerian), or parasitic ...
[111]
Mimicry and mitonuclear discordance in nudibranchs - NIH
Sep 17, 2020 · The type genus, Chromodoris, is brightly colored and exhibits blue, black, yellow, and white color patterns, similar to the warning colors found ...