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Amastra subrostrata

Species of gastropod From Wikipedia, the free encyclopedia

Amastra subrostrata
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Amastra subrostrata was an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.[3]

Subspecies
  • Amastra subrostrata acuminata C. M. Cooke, 1933
  • Amastra subrostrata subrostrata (L. Pfeiffer, 1859)

Quick Facts Conservation status, Scientific classification ...
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Description

The length of the shell attains 15 mm, its diameter 8 mm

The shell is imperforate, dextral, ovate-conic, and solid, with an irregularly striate surface that is slightly glossy. Its coloration is brown, irregularly clouded with tawny hues.

The spire is swollen-conic with a rather acute apex and consists of six whorls. The first four whorls are barely convex, while the body whorl is rounded and accounts for about two-fifths of the total length. A nearly basal, acute, and oblique columellar lamella is present.

The aperture is slightly oblique and irregularly semi-elliptical, angular at the columella, giving it a beak-like extension. The peristome is unexpanded and white-lipped within, with the right margin slightly spreading and the columellar margin only slightly dilated and adnate.[4]

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Distribution

This species was endemic to Hawai, occurring on Oʻahu.

References

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