The Small-ribboned Oahu Tree Snail was described in 1846; like all members of its genus, it was endemic to the island of O’ahu in the Hawaiian Islands.
The shells reach sizes of about 1,8 to 2 cm in height; they are dextral, ovate-oblong, spiro-conic, solid, striatulate, more obsolete toward the apex and with slightly convex whorls; glossy white, ornamented with varying brown bands; the white columella is strongly toothed above and the margin is dilated, reflexed and appressed; the white aperture is irregularly semioval; the peristome is narrowly thickened outside and strongly lipped within. [1]
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The Small-ribboned Oahu Tree Snail was last seen in 1966 at the Hawai’iloa- and the Kuliouou Ridges in the Ko’olau Mountains; it is now most like exinct. [1]
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According to some authors, this species is actually a subspecies of the Green Oahu Tree Snail (Achatinella viridans Mighels), as there seems to be a complete integration between them. [1]
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References:
[1] Recovery Plan for the O’ahu Tree Snails of the genus Achatinella. U.S. Department of the Interior Fish and Wildlife Service. Region One, Portland, Oregon. April 1993
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(public domain)
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edited: 08.06.2021