Thordisa lurca

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Thordisa lurca
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked):clade Heterobranchia
clade Euthyneura
clade Nudipleura
clade Nudibranchia
clade Euctenidiacea
clade Doridacea
Superfamily: Doridoidea
Family: Discodorididae
Genus: Thordisa
Species:T. lurca
Binomial name
Thordisa lurca
(Ev. Marcus & Er. Marcus, 1967)
Synonyms
  • Nuvuca lurcaEv. Marcus & Er. Marcus, 1967 [1]

Thordisa lurca is a species of sea slug, a dorid nudibranch, shell-less marine opisthobranch gastropod molluscs in the family Discodorididae. [2]

In biology, a species ( ) is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. While these definitions may seem adequate, when looked at more closely they represent problematic species concepts. For example, the boundaries between closely related species become unclear with hybridisation, in a species complex of hundreds of similar microspecies, and in a ring species. Also, among organisms that reproduce only asexually, the concept of a reproductive species breaks down, and each clone is potentially a microspecies.

Sea slug group of marine invertebrates with varying levels of resemblance to terrestrial slugs

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.

Nudibranch order of molluscs

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", and "dragon". Currently, about 3,000 valid species of nudibranchs are known.

Distribution

This species was described from the Caribbean Sea. It has been reported from Brazil. [3]

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References

  1. Marcus, Eveline; Marcus, Ernst (1967). "Biological Investigations of the Deep Sea. 33. Opisthobranchs from the Southwestern Caribbean Sea". Bulletin of Marine Science. 17 (3): 621–623.
  2. Rosenberg, G. (2015). Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. "Thordisa lurca". MolluscaBase. World Register of Marine Species.
  3. Garcia, Francisco J.; Dominguez, Marta; Troncoso, Jesús S. (2007). "Biogeographic considerations of the Opisthobranchia (Mollusca : Gastropoda) fauna from the Brazilian littoral and nearby areas". Bonner Zoologische Beiträge. 55 (3–4): 218. BHL page 44801616.