Amastra subrostrata

Amastra subrostrata
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
†A. subrostrata
Binomial name
†Amastra subrostrata
Location of Oʻahu
Synonyms
  • Achatinella (Laminella) subrostrata L. Pfeiffer, 1859 superseded combination
  • Achatinella subrostrata L. Pfeiffer, 1859 superseded combination
  • Amastra (Metamastra) subrostrata (L. Pfeiffer, 1859) alternative representation

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)

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]

Distribution

This species was endemic to Hawai, occurring on Oʻahu.

References

  1. ^ Mollusc Specialist Group (1996). "Amastra subrostrata". IUCN Red List of Threatened Species. 1996: e.T997A13101221. doi:10.2305/IUCN.UK.1996.RLTS.T997A13101221.en. Retrieved 14 November 2021.
  2. ^ "WoRMS - World Register of Marine Species - Amastra subrostrata (L. Pfeiffer, 1859)". www.marinespecies.org. Retrieved 2024-11-19.
  3. ^ Amastra subrostrata (L. Pfeiffer, 1859). 28 December 2024. Retrieved through: World Register of Marine Species.
  4. ^ 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. 174. Retrieved 3 December 2024.{{cite book}}: CS1 maint: multiple names: authors list (link) Public Domain This article incorporates text from this source, which is in the public domain.
  • Cooke, C.M. Jr. (1933). "New species of Amastridae". Bernice P. Bishop Museum Occasional Papers. 10a6: 1–29.
  • 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)