Amastra subrostrata

Amastra subrostrata
Conservation status
Extinct  (IUCN 2.3) [1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Amastridae
Genus:	Amastra
Species:	†A. subrostrata
Binomial name
†Amastra subrostrata Pfeiffer, 1859 [2]
Location of Oʻahu
Synonyms
Achatinella (Laminella) subrostrataL. Pfeiffer, 1859 superseded combination Achatinella subrostrataL. Pfeiffer, 1859 superseded combination Amastra (Metamastra) subrostrata(L. Pfeiffer, 1859) alternative representation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 acuminataC. 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. 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.

External links

• Pfeiffer, L. (1859). "Descriptions of eight new species of Achatinella, from Mr. Cuming's collection". Proceedings of the Zoological Society of London. 27 (385): 31. Retrieved 28 December 2024.