Achatinella casta
| Achatinella casta | ||||||||||||
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Achatinella casta |
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| Scientific name | ||||||||||||
| Achatinella casta | ||||||||||||
| Newcomb , 1853 |
Achatinella casta is an extinct species of snail from the on the island of O'ahu endemic terrestrial snails genus Achatinella .
description
Achatinella casta achieved a case length of 16.5 mm and a case diameter of 8.25 mm. The robust case was conically elongated and polished to a shine. There were both right-hand and left-hand winding cases. The six round turns were edged at the top. The mouth was almost ovoid and quite small. The simple lip was thickened on the inside. The spindle was short with a strongly coiled brownish transverse lamella. The color of the case was either white or yellow with extremely different black, brown, pink or white transverse bands that were arranged in various ways.
distribution
The occurrence of Achatinella casta was limited to the region of the Waimalu-Waiau chain and the districts ʻEwa , Hālawa and Waipiʻo on the island of Oʻahu. The northern limit of the distribution area was the valley below the Mauna Rua.
status
The causes and timing of the extinction are unknown. The species has become known through the collections of Wesley Newcomb , Charles Montague Cooke and Irwin Spalding .
literature
- Henry A. Pilsbry and C. Montague Cooke: Manual of Conchology. Structural and Systematic. Volume XXII. Achatinellidae . Conchological Department, Philadelphia, 1912-1914
- EW Thwing, Henry A. Pilsbry and C. Montague Cooke: Occasional papers of Bernice P. Bishop Museum (1907-1917) . Bernice P. Bishop Museum
Web links
- Achatinella casta in the endangered Red List species the IUCN 2007. Posted by: Mollusc Specialist Group, 1996. Accessed July 19 of 2008.