Hamakua Amastra Snail (Amastra sinistrorsa)
This species was described in 1906; it is apparently known only from subfossil specimens that were recovered from Holocene deposits in Mana in the Hāmākua District near the north-eastern coast of the island of Hawai’i, Hawaiian Islands.
The shells reach sizes of about 1,4 cm in height.
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Depiction from: ‘George W. Tryon; Henry A. Pilsbry; a. o.: Manual of Conchology. Second series: Pulmonata. Vol 21: Achatinellidae (Amastrinae). 1911’
(public domain)
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edited: 12.08.2022