Aldisa williamsi

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Aldisa williamsi
Scientific classification
Kingdom:
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(unranked):
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Species:
A. williamsi
Binomial name
Aldisa williamsi
Elwood, Valdes & Gosliner, 2000 [1]

Aldisa williamsi is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Cadlinidae.

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 Barracuda Point in Papua New Guinea. It has subsequently been found in Sulawesi, Flores, Rinca Is. and Pantar Is., in Indonesia. [2]

Papua New Guinea constitutional monarchy in Oceania

Papua New Guinea, officially the Independent State of Papua New Guinea, is an Oceanian country that occupies the eastern half of the island of New Guinea and its offshore islands in Melanesia, a region of the southwestern Pacific Ocean north of Australia. Its capital, located along its southeastern coast, is Port Moresby. The western half of New Guinea forms the Indonesian provinces of Papua and West Papua.

Sulawesi island of Indonesia

Sulawesi, formerly known as Celebes, is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Archipelago. Within Indonesia, only Sumatra, Borneo and Papua are larger in territory, and only Java and Sumatra have larger populations.

Flores island of the Lesser Sunda Islands in Maritime Southeast Asia

Flores is one of the Lesser Sunda Islands, a group of islands in the eastern half of Indonesia. The population was 1,831,000 in the 2010 census and the largest town is Maumere. The name Flores is derived from the Portuguese for "flowers".

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References

  1. Elwood, H.R., Valdes, A. & Gosliner, T.M. (2000). Two new species of Aldisa Bergh, 1878 (Mollusca, Nudibranchia) from the tropical Indo-Pacific. Proc. Calif. Acad. Sci., 52(14): 171-181.
  2. Rudman, W.B., 2002 (March 11) Aldisa williamsi Elwood, Valdes & Gosliner, 2000. [In] Sea Slug Forum. Australian Museum, Sydney.