Antonietta janthina

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Antonietta janthina
Antonietta janthina.jpg
Antonietta janthina - Tropical form
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Nudipleura
clade Nudibranchia
clade Dexiarchia
clade Cladobranchia
clade Aeolidida
Superfamily:
Aeolidioidea
Family:
Facelinidae
Genus:
Antonietta
Species:
A. janthina
Binomial name
Antonietta janthina
Baba & Hamatani, 1977 [1]

Antonietta janthina is a colourful species of sea slug or aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae. [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.

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 nudibranch is known from south-east Japan. [3] A similarly coloured species is found in Indonesia, the Philippines and Thailand. [4] [5]

Japan Country in East Asia

Japan is an island country in East Asia. Located in the Pacific Ocean, it lies off the eastern coast of the Asian continent and stretches from the Sea of Okhotsk in the north to the East China Sea and the Philippine Sea in the south.

Description

Antonietta janthina has a pink-purple body with white surface pigment. The numerous cerata have purple digestive gland inside them and superficial white or pale yellow pigment covering the tips. The oral tentacles are bright yellow and there is a median band of the same colour on the head. The rhinophores are orange with a median band of white. [3] This species can reach a total length of at least 10 mm. [3]

Cerata anatomical structures found in nudibranch sea slugs

Ceras, plural Cerata, are anatomical structures found externally in nudibranch sea slugs, especially in aeolid nudibranchs, marine opisthobranch gastropod mollusks in the clade Aeolidida. The singular of cerata is ceras, which comes from the Greek word "κέρας", meaning "horn", a reference to the shape of these structures.

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References

  1. ↑ Baba, K. & Hamatani, I. (1977): A new species tentatively referred to Antonietta, Antonietta janthina, from Japan (Nudibranchia: Eolidoidea: Facelinidae). The Veliger 20(1): 9-13.
  2. ↑ Bouchet, P.; Gofas, S. (2012). Antonietta janthina Baba & Hamatani, 1977. Accessed through: World Register of Marine Species on 2012-06-05
  3. 1 2 3 Rudman, W.B., 2006 (April 11) Antonietta janthina Baba & Hamatani, 1977. [In] Sea Slug Forum. Australian Museum, Sydney.
  4. ↑ Rudman, W.B., 2009 (October 26) Antonietta cf. janthina [In] Sea Slug Forum. Australian Museum, Sydney.
  5. ↑ "Antonietta janthina page at nudipixel". Archived from the original on 2011-06-29. Retrieved 2011-07-09.
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