Polycelis


Polycelis is a genus of planarians in the family Planariidae found in the Holarctic region. 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 and Ijimia. It is differentiated from them by lacking both a highly developed muscle coat around the male atrium and adenodactyls.

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:Polycelis aurantiacus Polycelis benazzii Polycelis bilinearis Polycelis brunnea Polycelis catulus Polycelis cormita Polycelis coronata Polycelis eburnea Polycelis elegans Polycelis eudendrocoeloides Polycelis eurantron Polycelis fallax Polycelis felina Polycelis gracilis Polycelis jinglensis Polycelis jingyuanica Polycelis kashmirica Polycelis koslowi Polycelis kulsaika Polycelis lhunzhubica Polycelis linkoi Polycelis nigra Polycelis nigro-fusca Polycelis nyingchica Polycelis oculimarginata Polycelis pallida Polycelis pamirensis Polycelis panniculatus Polycelis pantherina Polycelis pathan Polycelis polyopis Polycelis pulla Polycelis receptaculosa Polycelis relicta Polycelis sapporo Polycelis schmidti Polycelis sierrensis Polycelis sinensis Polycelis stummeri Polycelis surantion Polycelis tenuis Polycelis tibetica Polycelis tothi Polycelis vaginuloides Polycelis variabilis Polycelis wutaishanica Polycelis yangchengensis