Amastra undata

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

Amastra undata 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 17 mm, its diameter 12 mm.

(Later supplemental description by Hyatt, A. & Pilsbry, H. A. ) The shell contains six whorls. It is imperforate, globose-ovate, and moderately solid. It has a dark reddish-brown color, with broad, irregular light yellow stripes on the last two whorls. These stripes form a zigzag pattern below the periphery, blending together above it, and are preceded by scattered whitish spots and dashes on one or two earlier whorls. The spire is straightly conic, with slightly convex whorls. The shell of the protoconch is sharply and finely striate, while the later whorls are deeply and finely striate, with the striae intersected by several incised spiral lines in the peripheral region and above it.

The aperture is subvertical, with a flesh-colored interior and a white callous rim within the lip. The columellar fold is broad and subhorizontal.^[2]

Distribution

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

References

^ Amastra undata(Baldwin, 1895). 6 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. 301. 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 undata(Baldwin, 1895). 6 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. 301. 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.

[1]

[2]