''Alcyna subangulata'' is a
species of
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
, a
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
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* ...
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusk in the
family Trochidae, the top snails.
[Bouchet, P. (2013). Alcyna subangulata Pease, 1861. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=719077 on 2014-01-07]
Description
The height of the shell attains 2½ mm, its diameter 1½ mm. The minute, rather solid, narrowly perforate shell has an ovate-turbinate shape. It is ornamented with raised spiral striae. The four
whorl
A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).
Whorls in nature
File:Photograph and axial plane flo ...
s are depressed somewhat in the center. The body whorl is obtusely biangular with about four low spiral cords above the upper angle, two and a very weak third between the angles. The base of the shell contains numerous spirals. The outer
lip is thickened externally with a swelling or varix. The
umbilicus is rather large. The
aperture is circular. The
columella ends in a prominent tooth. The color is deep red, wtth oblique light red flames radiating from the suture.
H. Pilsbry, Marine Mollusks of Hawaii, I-III;Proceedings of the Academy of Natural Sciences of Philadelphia v. 69 (1917); pl. XV 5, 6, 7
Distribution
This marine species occurs off the Seychelles, Mauritius, Réunion
Réunion (; french: La Réunion, ; previously ''Île Bourbon''; rcf, label= Reunionese Creole, La Rényon) is an island in the Indian Ocean that is an overseas department and region of France. It is located approximately east of the island ...
and Hawaii.
References
* Adams, H. 1868. ''Descriptions of some new species of shells collected by Geoffrey Nevill, Esq., at Mauritius, the Isle of Bourbon, and the Seychelles''. Proceedings of the Zoological Society of London 1868:288-292, pl. 28,
* Kay, E.A. (1979). ''Hawaiian marine shells. eef and shore fauna of Hawaii, Section 4: Mollusca''. Bernice P. Bishop Museum Special Publication 64(4) Honolulu : Bishop Museum Press. xvii + 653 pp.
External links
To World Register of Marine Species
{{Taxonbar, from=Q13257321
subangulata
Gastropods described in 1861