Kaunakakai Amastra Snail (Amastra kaunakakaiensis)
The Kaunakakai Amastra Snail was apparently restricted to in the vicinity of a freshwater spring near a pipeline trail in Kaunakaki, a place at the southern coast of the Hawaiian island of Moloka’i, a place that it shared with at least one other species of the same genus, the Fragile Amastra Snail (Amastra fragilis Pilsbry & Cooke).
The shells reached sizes of about 1,3 to 1,4 cm in heigth.
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References:
[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 23: Appendix to Amastridae. Tornatellinidae. Index, vols. XXI-XXIII. 1915-1916
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(public domain)
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edited: 15.06.2020