Platydoris striata

Platydoris striata
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Infraclass:	Euthyneura
Order:	Nudibranchia
Suborder:	Doridina
Superfamily:	Doridoidea
Family:	Discodorididae
Genus:	Platydoris
Species:	P. striata
Binomial name
	Platydoris striata; (Kelaart, 1858) [1]
Synonyms [2]
	Doris striataKelaart, 1858) ;

Last updated May 02, 2019

Platydoris striata is a species of sea slug, a dorid nudibranch, shell-less marine opisthobranch gastropod mollusks 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 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.

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 Sri Lanka (Ceylon). It is reported from the Red Sea and the Indian Ocean.^[3]

Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, is an island country in South Asia, located in the Indian Ocean to the southwest of the Bay of Bengal and to the southeast of the Arabian Sea. The island is geographically separated from the Indian subcontinent by the Gulf of Mannar and the Palk Strait. The legislative capital, Sri Jayawardenepura Kotte, is a suburb of the commercial capital and largest city, Colombo.

The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez. The Red Sea is a Global 200 ecoregion. The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley.

The Indian Ocean is the third largest of the world's oceanic divisions, covering 70,560,000 km² (27,240,000 sq mi). It is bounded by Asia on the north, on the west by Africa, on the east by Australia, and on the south by the Southern Ocean or, depending on definition, by Antarctica.

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References

↑ Kelaart, E. F. (1858). New and little known species of Ceylon nudibranchiate molluscs, and zoophytes. Journal of the Ceylon Branch of the Royal Asiatic Society of Great Britain and Ireland, 3, 76–124.
1 2 Rosenberg, G. (2015). Platydoris striata. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-05-11
↑ Rudman, W.B., 2000 (October 3) Platydoris striata (Kelaart, 1858). [In] Sea Slug Forum. Australian Museum, Sydney.

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[1] Kelaart, E. F. (1858). New and little known species of Ceylon nudibranchiate molluscs, and zoophytes. Journal of the Ceylon Branch of the Royal Asiatic Society of Great Britain and Ireland, 3, 76–124.

[WoRMS-2] 1 2 Rosenberg, G. (2015). Platydoris striata. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-05-11

[3] Rudman, W.B., 2000 (October 3) Platydoris striata (Kelaart, 1858). [In] Sea Slug Forum. Australian Museum, Sydney.