Amastra aemulator

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

Amastra aemulator 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 15.5 mm, its diameter 8.6 mm.

(Original description) The shell contains seven whorls. The shell is narrowly perforate, ovate-pyramidal, and moderately solid. The spire's outlines are nearly straight at the base, becoming slightly concave near the apex. The whorls are slightly convex and relatively short. The 2½ whorls of the protoconch are a dull purplish color and very finely and regularly striate when unworn. The subsequent whorls are irregularly wrinkle-striate, with the cuticle initially light olive, transitioning to olive-brown on the last two whorls. The surface is somewhat glossy, but where the cuticle is worn away, it reveals a dull gray and purplish-brown calcareous layer beneath.

The aperture is small, slightly oblique, and dull purplish-gray inside, becoming paler with a barely perceptible thickening near the lip. The columella is short, thick, and whitish, featuring a subhorizontal lamella. The parietal callus is very thick, its edge forming a ledge that seamlessly connects the ends of the lip.^[2]

Distribution

This species is endemic to Hawaii and occurs on Oahu Island.

References

^ Amastra aemulator Hyatt & Pilsbry, 1911. 2 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. pp. 190–191. Retrieved 2 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 aemulator Hyatt & Pilsbry, 1911. 2 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. pp. 190–191. Retrieved 2 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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