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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 name "sea slug" is often applied to nudibranchs and a paraphyletic set of other marine gastropods without apparent shells. [2] Sea slugs have an enormous variation in body shape, color, and size. Most are partially translucent. The often bright colors of reef-dwelling species imply that these animals are under constant threat of predators ...
Aeolidiidae, a family of aeolid nudibranchs, are a family of sea slugs, shell-less marine gastropod molluscs. [2] Most, or perhaps all, members of this family feed on sea anemones and have a distinctive single row of comb-shaped serrated radular teeth. [3]
In the order of Nudibranchia, these 'sea slugs' are not considered marine worms but instead mollusks who lack a shell which is a main characteristic in classification. Nudibranchia exhibit bilateral symmetry in overall body structure as well as in gill feature.
Platyhelminthes (flatworms) form another worm phylum which includes a class Cestoda of parasitic tapeworms. ... This nudibranch is a sea slug.
Bathydevius is the first nudibranch, or sea slug, known to live in the deep sea. The sea slug’s body is made up of a large gelatinous hood and paddle-like tail. It can glow with bioluminescence.
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 ...
Pteraeolidia ianthina is a sea slug, an aeolid nudibranch in the family Facelinidae. [ 2 ] [ 3 ] It is known as a blue dragon , [ 4 ] a name it shares with Glaucus atlanticus and Glaucus marginatus .