Leucotina casta

Leucotina casta
Shell of Leucotina casta (specimen at Museums Victoria)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Superfamily:	Pyramidelloidea
Family:	Amathinidae
Genus:	Leucotina
Species:	L. casta
Binomial name
Leucotina casta (A.Adams, 1853)
Synonyms
Actaeon dianae A. Adams, 1855 † Actaeon praestitus H. J. Finlay, 1924 (junior subjective synonym) Actaeopyramis casta (A. Adams, 1853) Acteon austrinus R. B. Watson, 1883 Acteon dianae (A. Adams, 1855) Acteon huttoni Cossmann, 1895 · unaccepted Acteon praestitus H. J. Finlay, 1924 † Admete ambigua F. W. Hutton, 1885 (junior subjective synonym) Fossarus bulimoides Tenison Woods, 1877 † Leucotina ambigua (F. W. Hutton, 1885) (junior subjective synonym) Leucotina dianae (A. Adams, 1855) Leucotina esther Angas, 1867 Leucotina niphonensis A. Adams, 1860 Monoptygma casta A. Adams, 1853 (superseded combination) Monoptygma concinna A. Adams, 1854 (misspelling of genus) Monoptygma pura A. Adams, 1854 (junior subjective synonym) Monotygma casta (A. Adams, 1853) superseded combination Monotygma concinna (A. Adams, 1854) superseded combination Monotygma pura (A. Adams, 1854) junior subjective synonym Odostomia gigantea Dunker, 1877 † Odostomia sulcata F. W. Hutton, 1885 (invalid: junior primary homonym...) Rissoa punctatostriata Tenison Woods, 1879 † Tenuiactaeon ambiguus (F. W. Hutton, 1885)

Leucotina casta is a species of gastropods belonging to the family Amathinidae.

Description

(Described as Acteon austrinus) The small, thin shell is ovate. It is strongly striated, with a high conical spire, a blunt tip, and a tumid body whorl.

Sculpture : Longitudinals: the lines of growth are very faint and somewhat markedly oblique. Spirals: the whole surface is scored with strong equal furrows which are about half the breadth of the interstices. These furrow are not stippled, but are delicately and regularly cut across on the lines of growth by fine threads. There are about 20 of these furrows on the body and about 9 on the penultimate whorl.

The colour of the shell is porcellanous, with a glossy surface.

The rather high spire is conical and subscalar. The protoconch is rather large, blunt and flattened. It has a very slight inversion of the extreme tip. There are nearly five whorls, very little convex. The body whorl is rather large and somewhat tumid. The slight suture is rather oblique and scarcely impressed. The aperture is oval, pointed above and a little oblique in its direction. The outer lip is sharp and thin, with its edge crenulated by the sculptural spirals. In direction it is straight above, well curved on the base, where it is very slightly emarginate. The inner lip is very slightly convex on the body. It passes gradually into the short concave columella, at the base of which there is only the faintest trace of a tooth. Its edge is sharp and patulous, with a minute chink behind it.

Distribution

The marine species is found in Australia, New Zealand, Korea, Taiwan and Japan.

References

• Cossmann, M. (1895). The Pliocene Mollusca of New Zealand, par F.W. Hutton [review]. Feuilles des Jeunes Naturalistes. 25 (299): 173–175
• Finlay H.J. (1924). Some necessary changes in the names of New Zealand Mollusca. Proceedings of the Malacological Society of London. 16: 99-107.

External links

• Gbif.org: iNaturalist Research-grade Observations
• Adams, A. (1853). A monograph of the genus Monoptygma of Lea. Proceedings of the Zoological Society of London. (1851) 19: 222-224
• Angas, G. F. (1867). Descriptions of thirty-two species of marine shells from the coast of New South Wales. Proceedings of the Zoological Society of London. (1867): 110-117, pl. 13
• Dunker, W. (1877). Mollusca nonnulla nova maris Japonici. Malakozoologische Blätter. 24: 67-75.
• Tenison Woods, J. E. (1879). On some new species of Tasmanian marine shells. Papers and Proceedings of the Royal Society of Tasmania. 1878: 32-40
• Watson, R. B. (1879-1883). Mollusca of H.M.S. 'Challenger' Expedition. Journal of the Linnean Society of London. 14: 506-529, 586-605, 692-716
• Hutton, F. W. (1885). Descriptions of new Tertiary shells. Part 1. Transactions of the New Zealand Institute 17: 313-324.
• Beu A.G. (2004) Marine Mollusca of oxygen isotope stages of the last 2 million years in New Zealand. Part 1: Revised generic positions and recognition of warm-water and cool-water migrants. Journal of the Royal Society of New Zealand 34(2): 111-265.
• Spencer H.G., Willan R.C., Marshall B.A. & Murray T.J. (2011). Checklist of the Recent Mollusca Recorded from the New Zealand Exclusive Economic Zone.