Polycelis
''Polycelis'' is a genus of planarians in the family Planariidae found in the Holarctic region (North America and Eurasia). The genus was described in 1831 by Christian Gottfried Ehrenberg and currently has no consensus on the exact number of species. Description Species of ''Polycelis'' are characterized by having multiple eyes on the anterior region, similar to the related genera ''Seidlia (planarian), Seidlia'' and ''Ijimia''. It is differentiated from them by lacking both a highly developed muscle coat around the male atrium (as seen in ''Seidlia'') and Reproductive system of planarians, adenodactyls (as seen in ''Ijimia''). Habitat Most species of ''Polycelis'' inhabit clean, high-altitudinal streams with water temperatures between 0 and 14 °C in Eurasia and North America. Species The following species are recognised in the genus ''Polycelis'':Tyler S, Schilling S, Hooge M, and Bush LF (comp.) (2006-2025Turbellarian taxonomic database Version 2.2 * ''Polycelis aurantiac ...
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