Amastra sola

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

Amastra sola 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 9.8 mm, its diameter 5⅓ mm.

(Original description) The shell contains 6½ whorls. The shell is openly perforate, conic, and thin, with minimal luster. The last one or two whorls are a rich dark reddish-brown, accented by lighter lines and patches, while the upper whorls appear pale yellowish, indicative of early cuticle decay.

The spire has straight outlines, though the individual whorls are markedly convex, creating a pronounced contour. The whorls in the protoconch are smooth, transitioning to later whorls that exhibit irregular fine growth-wrinkle sculpture.

The aperture is reddish-brown on the interior, with a very thin, sharp outer lip. The basal margin is well-rounded, while the columellar margin is straight, slightly dilated at the upper end, and arches over the narrow umbilicus. The columellar fold is thin, small, and strongly oblique, adding to the shell's delicate structure.^[2]

Distribution

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

References

^ Amastra sola Hyatt & Pilsbry, 1911. 3 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. 158. 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 sola Hyatt & Pilsbry, 1911. 3 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. 158. 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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