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A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into. When the word "snail" is used in this most general sense, it includes not just land snails but also numerous species of sea snails and freshwater snails. Gastropods that naturally lack a shell, or have only an internal shell, are mostly called slugs, and land snails that have only a very small shell are often called semi-slugs.
Nudibranchs are a group of soft-bodied, marine gastropod molluscs which shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match, such as "clown," "marigold," "splendid," "dancer," "dragon," or "sea rabbit." Currently, about 3,000 valid species of nudibranchs are known.
Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs are actually gastropods, i.e. they are sea snails that over evolutionary time have either completely lost their shells, or have seemingly lost their shells due to having a greatly reduced or internal shell. The name "sea slug" is most often applied to nudibranchs, as well as to a paraphyletic set of other marine gastropods without obvious shells.
Diaphanoidea is a taxonomic superfamily of small sea snails, marine opisthobranch gastropod mollusks or micromollusks in the Cephalaspidea, the headshield slugs and bubble snails.
Diaphanidae is a taxonomic family of small sea snails, marine opisthobranch gastropod molluscs or micromollusks in the superfamily Diaphanoidea, the headshield slugs and bubble snails.
Sea snail is a common name for slow moving marine gastropod molluscs usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible shell.
Glaucus marginatus is a species of small, floating, blue sea slug; a pelagic aeolid nudibranch; a marine opisthobranch gastropod mollusc in the family Glaucidae. This species is closely related to Glaucus atlanticus, and is part of a species complex along with Glaucus bennettae, Glaucus thompsoni, and Glaucus mcfarlanei. Like Glaucus atlanticus, it is commonly known as a blue dragon.
Elysia is a genus of sea slugs, marine gastropod molluscs in the family Plakobranchidae. These animals are colorful sea slugs, and they can superficially resemble nudibranchs, but are not very closely related to them. Instead they are sacoglossans, commonly known as sap-sucking slugs.
Chromodoris thompsoni is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Corambidae is a family name for sea slugs, dorid nudibranchs, marine gastropod molluscs.
Corambe is a genus of sea slugs, dorid nudibranchs, marine gastropod molluscs in family Corambidae within the superfamily Onchidoridoidea.
Glaucus is a genus of small blue pelagic sea slugs. They are aeolid nudibranchs, ranging in size from 20 to 40 mm. They feed on colonial cnidarians such as Portuguese man o' wars, blue buttons, and purple sails. They can produce painful and potentially dangerous stings when handled, as they store the venomous nematocysts of their prey. Glaucus is the only genus in the family Glaucidae. It includes five species.
Goniobranchus woodwardae is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Loy is a genus of sea slugs, dorid nudibranchs, marine gastropod mollusks in the family Corambidae within the superfamily Onchidoridoidea.
Fusinus thompsoni is a species of sea snail, a marine gastropod mollusk in the family Fasciolariidae, the spindle snails, the tulip snails and their allies.
Olivella thompsoni is a species of small sea snail, marine gastropod mollusk in the family Olivellidae, the dwarf olives.
Loy is both a given name and a surname.
Pseudovermis is genus of minute sea slugs, specifically aolid nudibranchs, marine gastropod mollusks or micromollusks in the family Pseudovermidae.
Epiactis thompsoni, the red-striped anemone, is a species of marine invertebrate in the family Actiniidae, found in New Zealand and South Australia. They are commonly found in the rocky intertidal zone.
Thomas Everett Thompson PhD DSc FZS was a British malacologist and embryologist, known for his extensive studies on opisthobranch molluscs.
References
- 1 2 Loy thompsoni (Millen & Nybakken, 1991). Sea Slug Forum, accessed 18 February 2010.
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