Amastra tricincta

Amastra tricincta
	Shell of Amastra tricincta (holotype)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Amastridae
Genus:	Amastra
Species:	A. tricincta
Binomial name
	Amastra tricincta; Hyatt & Pilsbry, 1911
Synonyms
	Amastra (Amastra) tricincta Hyatt & Pilsbry, 1911 alternative representation

Amastra tricincta is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.^[1]

Description

The length of the shell attains 1–8.8 mm, its diameter 5 mm.

(Original description) The shell contains 5 whorls. The shell is perforate, ovate-conic, very small, and thin, with a slight sheen. The spire's outlines are nearly straight. The whorls of the protoconch are somewhat convex, with the first half nearly smooth and carinate just above the suture. The subsequent whorl is very finely costulate or sharply striate, with a subtle angularity near the suture.

The later whorls are moderately convex, adorned with fine, irregular growth wrinkles. The body whorl is rounded at the periphery. The shell is dark brown, with the body whorl featuring opaque white revolving bands at the suture, periphery, and around the umbilical slit. It also bears several narrow, obliquely longitudinal black streaks, while the upper whorls are reddish-brown.

The aperture is dark within, displaying a distinct median white band. The outer lip is thin and acute. The columella is dark, with a thin but strongly oblique lamella.^[2]

Distribution

This species is endemic to Hawaii, occurring on Molokai Island.

References

^ Amastra tricincta Hyatt & Pilsbry, 1911. 5 December 2024. Retrieved through: World Register of Marine Species.
^ Hyatt, A. & Pilsbry, H. A. (1910–1911). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 21: Achatinellidae (Amastrinae). Philadelphia: Conchological Department, Academy of Natural Sciences. p. 277. Retrieved 3 December 2024.{{cite book}}: CS1 maint: multiple names: authors list (link) This article incorporates text from this source, which is in the public domain.

External links

Cowie, R. H., Evenhuis, N. L. & Christensen, C. C. (1995). Catalog of the native land and freshwater molluscs of the Hawaiian Islands. vi. Leiden: Backhuys Publishers. p. 107.{{cite book}}: CS1 maint: multiple names: authors list (link)

[WoRMS-1] Amastra tricincta Hyatt & Pilsbry, 1911. 5 December 2024. Retrieved through: World Register of Marine Species.

[2] Hyatt, A. & Pilsbry, H. A. (1910–1911). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 21: Achatinellidae (Amastrinae). Philadelphia: Conchological Department, Academy of Natural Sciences. p. 277. Retrieved 3 December 2024.{{cite book}}: CS1 maint: multiple names: authors list (link) This article incorporates text from this source, which is in the public domain.

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