Sinuose Hirasea Snail (Hirasea sinuosa) 

The Sinuose Hirasea Snail was described in 1902, it is or was endemic to the island of Hahajima, Ogasawara Islands, Japan.

The shells of this species reached sizes of about 0,21 cm in height and about 0,43 cm in diameter [1]

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Unfortunately it appears to be exremely hard to get any reliable information about this enigmatic snail genus.

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References:

[1] Henry A. Pilsbry: Notices of new Japanese land shells. The Nautilus 15(10): 116-119. 1902

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edited: 11.05.2019