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The family Limnocytheridae is represented in Canada by 22 species belonging to the genus Limnocythere and subgenus Limnocytherina. The following are described as new: Limnocythere (Limnocytherina) paraornata, Limnocythere (Limnocytherina) parascutariense, Limnocythere platyforma. The family Loxoconchidae is represented by the marine-brackish water form Cytheromorpha fuscata.
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L. D. Delorme (1971) studied this question.
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