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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]
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.
The name "sea slug" is also often applied to the sacoglossans (clade Sacoglossa), the so-called sap-sucking or solar-powered sea slugs which are frequently a shade of green. Another group of main gastropods that are often labeled as "sea slugs" are the various families of headshield slugs and bubble snails within the clade Cephalaspidea.
Costasiella kuroshimae (also known as a leaf slug, sea sheep, or leaf sheep) is a species of sacoglossan sea slug. Costasiella kuroshimae are shell-less marine opisthobranch gastropod mollusks in the family Costasiellidae. [1] Despite being animals, they indirectly perform photosynthesis, via kleptoplasty. [2]
Vayssierea felis is a species of sea slug, a dorid nudibranch, ... development and lays an egg mass of 3-5 eggs. [3] ... with the Spirorbis tube worms they eat. [3]
Aeolidia loui is a species of sea slugs, an aeolid nudibranch, a marine gastropod mollusc in the family Aeolidiidae. It has been regarded as the same species as the NE Atlantic Aeolidia papillosa but is now known to be a distinct species. [1] [2] Common names include shaggy mouse nudibranch, [3] and shag-rug nudibranch. [4]
Flabellina is a genus of sea slugs, specifically aeolid nudibranchs. These animals are marine gastropod molluscs in the family Flabellinidae. [3] Taxonomic history
This vent-endemic gastropod is known only from deep-sea hydrothermal vents in the Indian Ocean, where it has been found at depths of about 2,400–2,800 m (1.5–1.7 mi). Chrysomallon squamiferum differs greatly from other deep-sea gastropods, even the closely