Thorunna halourga

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Thorunna halourga
Thorunna halourga (5910988913).jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Infraclass: Euthyneura
Order: Nudibranchia
Suborder: Doridina
Superfamily: Doridoidea
Family: Chromodorididae
Genus: Thorunna
Species:
T. halourga
Binomial name
Thorunna halourga
Johnson R.F. & Gosliner, 2001 [1]

Thorunna halourga is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae. [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.

Contents

Distribution

This species was described from Rasch Passage, Madang, Papua New Guinea and Batangas, Philippines. It has been reported from tropical eastern Australia. [3]

Madang Town in Madang Province, Papua New Guinea

Madang(old German name: Friedrich-Wilhelmshafen) is the capital of Madang Province and is a town with a population of 27,420 on the north coast of Papua New Guinea. It was first settled by the Germans in the 19th century.

Papua New Guinea constitutional monarchy in Oceania

Papua New Guinea, officially the Independent State of Papua New Guinea is a country in Oceania 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.

Batangas Province in Calabarzon, Philippines

Batangas, officially known as the Province of Batangas is a province in the Philippines located in the Calabarzon region in Luzon. Its capital is the city of Batangas and is bordered by the provinces of Cavite and Laguna to the north and Quezon to the east. Across the Verde Island Passages to the south is the island of Mindoro and to the west lies the South China Sea. Poetically, Batangas is often referred to by its ancient name Kumintáng.

Description

The mantle is a pale lilac becoming purple in front of the rhinophores and behind the gills. The mantle margin, which is slightly undulate, has a broad white band. The rhinophores have a purple stalk and the lamellae are edged with orange. The gills are white with orange axes. [3]

Ecology

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References

  1. Johnson R.F. & Gosliner T.M. (2001) Two new species of Thorunna Bergh 1878 (Mollusca: Nudibranchia: Chromodorididae) from the Indo-Pacific. Bollettino Malacologico 37 (5-8): 143-150
  2. MolluscaBase (2018). Thorunna halourga R. F. Johnson & Gosliner, 2001. Accessed on 2018-12-23.
  3. 1 2 Rudman, W.B., 2002 (December 11) Thorunna halourga Johnson & Gosliner, 2001. [In] Sea Slug Forum. Australian Museum, Sydney.