Amastra breviata

Amastra breviata
	Shell of Amastra breviata
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Amastridae
Genus:	Amastra
Species:	A. breviata
Binomial name
	Amastra breviata; (Baldwin, 1895)
Synonyms
	Amastra (Metamastra) breviata (Baldwin, 1895) alternative representation;

Amastra breviata 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 7.5 mm.

(Original description) The shell contains 6 whorls. The shell is dextral, very minutely perforated, rather thin, and globosely conical, with a somewhat acute apex. The surface is unpolished, adorned with fine incremental lines, while the whorls in the protoconch are smooth. The coloration is corneous-brown, lacking an epidermis.

The shell consists of six slightly convex whorls, separated by a well-impressed suture. The aperture is slightly oblique and oval, with a livid-white interior that subtly reflects the shell's exterior color. The peristome is simple and thin, with its extremities connected by a delicate white or brown callosity. The columella is white, flexuous, and ends abruptly in a thin lamellar plait.^[2]

(Later supplemental description by Hyatt, A. & Pilsbry, H. A. ) The shell is moderately solid, with a reddish-chestnut coloration, paler below the suture, behind the lip, and around the perforation. It is often adorned with interrupted creamy lines and bands encircling the shell, particularly at and above the periphery. The aperture is flesh-colored on the interior, with the lip showing minimal thickening.^[3]

Distribution

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

References

^ Amastra breviata(Baldwin, 1895)1. 5 December 2024. Retrieved through: World Register of Marine Species.
^ Baldwind D.D. (1895). "Descriptions of new species of Achatinellidae from the Hawaiian Islands". Proceedings of the Academy of Natural Sciences of Philadelphia. 47: 231. [[source-attribution}}
^ 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. 171. 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.

External links

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 breviata(Baldwin, 1895)1. 5 December 2024. Retrieved through: World Register of Marine Species.

[2] Baldwind D.D. (1895). "Descriptions of new species of Achatinellidae from the Hawaiian Islands". Proceedings of the Academy of Natural Sciences of Philadelphia. 47: 231. [[source-attribution}}

[3] 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. 171. 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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