Amastra subobscura

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

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

Subspecies

Amastra subobscura puella Pilsbry & C. M. Cooke, 1914
Amastra subobscura subobscura Hyatt & Pilsbry, 1911

Description

The length of the shell attains 11.9 mm, its diameter 6 mm.

(Original description) The shell contains 6 whorls. The shell is minutely perforate, oblong-conic, and relatively thin with a slight sheen. The spire's outlines are nearly straight. The whorls of the protoconch are reddish-brown, with a smooth initial half-whorl followed by a coarsely costate whorl that is carinated just above the suture. The subsequent whorl is finely and densely costulate, with a subtle angularity near the lower suture.

The later whorls are convex, adorned with growth wrinkles and subplicate ridges just below the suture. They are pale fleshy-gray, partially covered by a very thin, smooth olivaceous cuticle, which is darkest on the latter half of the body whorl and absent near the aperture.

The aperture is pinkish-white, with the outer lip remaining unthickened. The parietal callus is whitish and moderately thick.^[2]

Distribution

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

References

^ Amastra subobscura 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. 276. 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 subobscura 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. 276. 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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