(This snail genus was previously placed in the family Eulotidae).
A few of the species in this genus are unusual in that specimens in those species always have left-handed "sinistral" coiling in their shells, as shown in the specimen on the right. The rest of the species in the genus are right-handed or "dextral" in the shell coiling, as is usually the case in the great majority of gastropods.
These snails are almost endemic to Japan, but one of them are distributed in Korea.
Most species in this genus have a dextral shell and 5 species are sinistral.[3]
Ueshima R. & Asami T. (16 October 2003). "Evolution: Single-gene speciation by left–right reversal". Nature425: 679. doi:10.1038/425679a
(in Japanese) Kawana M. (2007). かたつむりの世界〈マイマイ属〉The world of land snails (Euhadra) in Japan. Nagoya, Kinmirai-sha. 332 pp. ISBN978-4-906431-25-0 (with English introduction)
Yamazaki N., Ueshima R., Terrett J. A., Yokobori S., Kaifu M., Segawa R., Kobayashi T., Numachi K., Ueda T., Nishikawa K., Watanabe K. & Thomas R. H. (1997). "Evolution of pulmonate gastropod mitochondrial genomes: comparisons of complete gene organizations of Euhadra, Cepaea and Albinaria and implications of unusual tRNA secondary structures". Genetics145: 749-758.
Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017
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