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The exact systematics of nudibranchs are a topic of recent revision. Traditionally, nudibranchs have been treated as the order Nudibranchia, located in the gastropod mollusc subclass Opisthobranchia (the marine slugs: which consisted of nudibranchs, sidegill slugs, bubble snails, algae sap-sucking sea slugs, and sea hares). [44]
The nudibranch Nembrotha aurea is a gastropod. A sea cucumber also looks slug-like and is sometimes loosely called a "sea slug", but it is not a gastropod.. Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs.
Phylliroe is a genus of average sized (up to 5.5 centimetres or 2.2 inches), highly transparent pelagic nudibranchs, marine gastropod molluscs in the order Opisthobranchia, that consists of two known species. [2] It is notable for being an open-ocean hunter that resembles a fish in body plan and locomotion, an example of convergent evolution. [2]
This sea slug superficially resembles a nudibranch, yet it does not belong to that clade. Instead it is a member of the clade Sacoglossa, the sap-sucking sea slugs. Some members of this group use chloroplasts from the algae they eat for photosynthesis, a phenomenon known as kleptoplasty. Elysia chlorotica is one species of such "solar-powered ...
Melibe is a genus of sea slugs, nudibranchs, marine gastropod mollusks in the family Tethydidae. [2]Most nudibranchs are carnivores, but their prey is usually sessile or slow-moving animals such as sponges or bryozoans.
Cryptobranch dorid nudibranchs (previously known as the taxon Cryptobranchia), are nudibranch sea slugs within the clade Doridacea. These slugs are called "cryptobranch," meaning "hidden gill", because they are able to retract their gills into a gill pocket, in contrast to nudibranchs in the traditional group phanerobranchs (or Phanerobranchia), which taxon is probably paraphyletic (in other ...
Costasiella ocellifera is a small (5–13 mm) species of sea slug, a shell-less marine gastropod mollusk in the family Costasiellidae. [2] Costasiella ocellifera, and other members of the family Costasiellidae are often mistakenly classified as nudibranchs because they superficially resemble other species of that group, but they are actually a part of the Sacoglossa superorder of sea slugs ...
Sea clown triopha Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Order: Nudibranchia Superfamily: Polyceroidea Family: Polyceridae Genus: Triopha Species: T. catalinae Binomial name Triopha catalinae (Cooper, 1863) Triopha catalinae, commonly known as the sea clown triopha or sea clown, is a species of colorful sea slug called a nudibranch. Sea ...