Amastra praeopima

Amastra praeopima
	Shell of Amastra praeopima (holotype)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Amastridae
Genus:	Amastra
Species:	A. praeopima
Binomial name
	Amastra praeopima; C. M. Cooke, 1917
Synonyms
	Amastra (Metamastra) praeopima C. M. Cooke, 1917 alternative representation

Amastra praeopima 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 9.2 mm, its diameter 5.4 mm.

(Original description) The shell is perforate, dextral, globose, very thin, and transparent, with a uniform dull Brussels-brown coloration and no deciduous cuticle. The spire is short, obliquely triangular, with slightly convex outlines.

The whorls of the protoconch are convex, with the first being smooth and increasing rapidly in size. Subsequent whorls increase more gradually and are minutely sculptured with fine transverse growth-wrinkles. The whorls are convex and separated by a very shallow suture.

The body whorl is large, rotund, and prominent. The aperture is oblique and broad, with a very convex outer margin accented by a delicate lip-rib. The columella is narrowly triangular, slightly oblique, and features a concave inner margin and an erect, straight outer margin.

The columellar fold is strong, nearly transverse, and terminates abruptly near the base of the columella, close to the outer margin. The umbilicus is distinctly open and cleft-like, adding to the shell's delicate structure.^[2]

Distribution

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

References

^ Amastra praeopima C. M. Cooke, 1917. 2 January 2025. Retrieved through: World Register of Marine Species.
^ Cooke, C.M. (1917). "Some new species of Amastra". Occasional Papers of the Bernice P. Bishop Museum. 3 (3): 22. Retrieved 31 December 2024. 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. pp. 1–248.{{cite book}}: CS1 maint: multiple names: authors list (link)

[WoRMS-1] Amastra praeopima C. M. Cooke, 1917. 2 January 2025. Retrieved through: World Register of Marine Species.

[2] Cooke, C.M. (1917). "Some new species of Amastra". Occasional Papers of the Bernice P. Bishop Museum. 3 (3): 22. Retrieved 31 December 2024. This article incorporates text from this source, which is in the public domain.

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