''Antiguraleus permutatus'' 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

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 Mangeliidae.WoRMS (2015). Antiguraleus permutatus (Hedley, 1922). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=432999 on 2017-03-05

Description

The length of the shell attains 5.7 mm, its diameter 2.5 mm. (Original description) The small shell has an ovate-cylindrical shape and is rather gibbous. Its colour is white on the

protoconch A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...

, and pale cream on the remainder of the shell. It contains 5

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 floral ...

s of which two compose a rather elevate protoconch. Its sculpture shows on the first adult whorl are ten narrow, elevated, wide-spaced radials. These degenerate as growth advances; from the last suture they persist as downward dashes, and vanish on the anterior half of the shell. The entire surface carries dense microscopic spiral scratches. The aperture is narrow and vertical. The

varix A varix (pl. varices) is an abnormally dilated vessel with a tortuous course. Varices usually occur in the venous system, but may also occur in arterial or lymphatic vessels. Examples of varices include: * Varicose veins, large tortuous veins usua ...

is prominent and expanded. Near the summit is excavated a broad and shallow sinus, and at two-thirds of its length occurs a stromboid insinuation A thin free edge reaches over the aperture. On the columella is a substantial callus. The

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

is short, wide, and open. Hedley, C. 1922. A revision of the Australian Turridae. Records of the Australian Museum 13(6): 213-359, pls 42-56
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Distribution

This marine species is endemic to Australia and occurs off New South Wales.

References

* Laseron, C. 1954. ''Revision of the New South Wales Turridae (Mollusca)''. Australian Zoological Handbook. Sydney : Royal Zoological Society of New South Wales 1-56, pls 1-12.

External links

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1-1295.
{{Taxonbar, from=Q9617644 permutatus Gastropods described in 1922 Gastropods of Australia