Acremodontina alazon

Acremodontina alazon
	Shell of Acremodontina alazon (holotype in the Australian MUseum)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Superfamily:	Seguenzioidea
Family:	Trochaclididae
Genus:	Acremodontina
Species:	A. alazon
Binomial name
	Acremodontina alazon; (Hedley, 1905)
Synonyms
	Liotia alazon Hedley, 1905 (superseded combination)

Acremodontina alazon is a species of sea snails, a marine gastropod mollusc in the family Trochaclididae, the false top snails.^[1]

Description

The height of the shell attains 1.5 mm, its major diameter 1.75 mm, its minor diameter 1.37 mm.

(Original description) The minute shell is solid. It is turbinate, elevate, tricarinate, descending at the aperture and narrowly umbilicate. The surface is smooth and glossy. The colour of the shell is porcelain white.

The shell contains three whorls. The first forms the protoconch. The sculpture consists of three projecting lamellate keels revolving from the protoconch to the aperture. The third keel of the penultimate whorl is half covered by the suture of the following whorl. From the first keel, which runs along the shoulder, a nearly flat shelf extends to the suture. From the first to the third keel the side of the shell is nearly perpendicular. Around the umbilicus are three spiral cords. The aperture is oblique, angled above and rounded below. The outer lip is neither thickened nor reflected. The umbilicus is deep, narrow and contracted by the columella.^[2]

Distribution

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

References

^ Rosenberg, G. (2012). Acremodontina alazon (Hedley, 1905). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=594274 on 2012-12-23
^ Hedley, C. (1905). Mollusca from one hundred and eleven fathoms, East of Cape Byron, New South Wales. Records of the Australian Museum. 6(2): 41–54. This article incorporates text from this source, which is in the public domain.

External links

Marshall, B. A. (1995). Recent and Tertiary Trochaclididae from the southwest Pacific (Mollusca: Gastropoda: Trochoidea). The Veliger. 38: 92-115.

[WoRMS-1] Rosenberg, G. (2012). Acremodontina alazon (Hedley, 1905). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=594274 on 2012-12-23

[2] Hedley, C. (1905). Mollusca from one hundred and eleven fathoms, East of Cape Byron, New South Wales. Records of the Australian Museum. 6(2): 41–54. This article incorporates text from this source, which is in the public domain.

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