Amastra subcrassilabris

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

Amastra subcrassilabris 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 12.5 mm, its diameter 7.4 mm.

(Original description) The shell contains 6¼ whorls. The shell is perforate, acutely ovate, solid and lacks a glossy surface. The spire's outlines are straight or only slightly contracted near the summit, with nearly flat whorls. The whorls of the protoconch are finely striated, while the subsequent whorls are marked by growth wrinkles. The body whorl is spirally malleate below the periphery in the type specimen, though smooth in another example.

The spire is brown, with the penultimate whorl gradually becoming paler. The body whorl is cream-white, occasionally retaining small patches of a thin brown cuticle. The aperture is slightly oblique and white within, with the outer lip thickened by a prominent white rib. The columella is white, straight, and narrowly reflexed, featuring a small white submedian fold.^[2]

Distribution

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

References

^ Amastra subcrassilabris Hyatt & Pilsbry, 1911. 4 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. 293. 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.

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 subcrassilabris Hyatt & Pilsbry, 1911. 4 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. 293. 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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