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about 100 species in south Asia, diverse in African Lakes, and Sri Lanka. Formerly classified with the Pleuroceridae by some authors.
* Pleuroceridae -- abundant and diverse in eastern North America, largely high-spired snails of small to large size. About 150 species.
* Semisulcospiridae -- primarily eastern Asia, Japan, also the Juga snails of northwestern North America. Formerly included with the Pleuroceridae. About 50 species.
* Thiaridae

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