Polycelis
{{Short description|Genus of flatworms}}
{{Automatic taxobox
| image = Polycelis nigra.jpg
| image_caption = Polycelis nigra
| taxon = Polycelis
| authority = Ehrenberg, 1831
| synonyms =
- Polycelidia Livanov & Zabusova, 1940
- Polycoelis Beneden, 1861
- Polyscelis Girard, 1850
- Sorocelides Zabusova, 1929
}}
Polycelis is a genus of planarians in the family Planariidae found in the Holarctic region (North America and Eurasia).{{cite journal | doi = 10.11646/zootaxa.5536.4.5| title = Two species of Polycelis (Platyhelminthes, Tricladida, Planariidae) newly recorded for the Qinling Mountains and the Loess Plateau in China, with a comparative discussion on their karyotypes| date = 2024| last1 = Sun| first1 = XIN-XIN| last2 = Wang| first2 = LEI| last3 = Li| first3 = Ning| last4 = Sluys| first4 = Ronald| last5 = Liu| first5 = DE-Zeng| last6 = Dong| first6 = ZI-MEI| last7 = Chen| first7 = Guang-WEN| journal = Zootaxa| volume = 5536| issue = 4| pages = 581–599| pmid = 39646355}}{{GBIF |id=2502880 |taxon=Polycelis |accessdate=31 May 2021}} 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 (as seen in Seidlia) and adenodactyls (as seen in Ijimia).
Habitat
Species
The following species are recognised in the genus Polycelis:Tyler S, Schilling S, Hooge M, and Bush LF (comp.) (2006-2025) [https://turbellaria.umaine.edu Turbellarian taxonomic database]. Version 2.2
{{Div col}}
- Polycelis aurantiacus {{small|Panceri, 1875}}
- Polycelis benazzii {{small|de Beauchamp, 1955}}
- Polycelis bilinearis {{small|Diesing, 1850}}
- Polycelis brunnea {{small|(Müller, 1773)}}
- Polycelis catulus {{small|Girard, 1893}}
- Polycelis cormita {{small|Hunt, 1948}}
- Polycelis coronata {{small|(Girard, 1891)}}
- Polycelis eburnea {{small|(Muth, 1912)}}
- Polycelis elegans {{small|Diesing, 1850}}
- Polycelis eudendrocoeloides {{small|Zabusova, 1929}}
- Polycelis eurantron {{small|Zabusova, 1936}}
- Polycelis fallax {{small|Quatrefage, 1845}}
- Polycelis felina {{small|(Dalyell, 1814)}}
- Polycelis gracilis {{small|(Seidl, 1911)}}
- Polycelis jinglensis {{small|Liu, 1996}}
- Polycelis jingyuanica {{small|Liu, 1996}}
- Polycelis kashmirica {{small|Liu, 1993}}
- Polycelis koslowi {{small|(Zabusov, 1911)}}
- Polycelis kulsaika {{small|Zabusov-Zhdanova, 1947}}
- Polycelis lhunzhubica {{small|Liu, 1993}}
- Polycelis linkoi {{small|Sabussov, 1901}}
- Polycelis nigra {{small|(Müller, 1774)}}
- Polycelis nigro-fusca {{small|Diesing, 1850}}
- Polycelis nyingchica {{small|Liu, 1993}}
- Polycelis oculimarginata {{small|(Palombi, 1931)}}
- Polycelis pallida {{small|Diesing, 1850}}
- Polycelis pamirensis {{small|de Beauchamp, 1961}}
- Polycelis panniculatus {{small|Girard, 1893}}
- Polycelis pantherina {{small|Babalean, 2022}}
- Polycelis pathan {{small|de Beauchamp, 1959}}
- Polycelis polyopis {{small|Zabusova, 1936}}
- Polycelis pulla {{small|Diesing, 1850}}
- Polycelis receptaculosa {{small|(Livanov & Zabusova, 1940)}}
- Polycelis relicta {{small|(Sabussowa, 1929)}}
- Polycelis sapporo {{small|(Ijima & Kaburaki, 1916)}}
- Polycelis schmidti {{small|(Zabusov, 1916)}}
- Polycelis sierrensis {{small|Kenk, 1973}}
- Polycelis sinensis {{small|Liu, 1993}}
- Polycelis stummeri {{small|(Seidl, 1911)}}
- Polycelis surantion {{small|Zabusova, 1936}}
- Polycelis tenuis {{small|Ijima, 1884}}
- Polycelis tibetica {{small|Hyman, 1934}}
- Polycelis tothi {{small| Mehely, 1927}}
- Polycelis vaginuloides {{small|Diesing, 1850}}
- Polycelis variabilis {{small|Girard, 1850}}
- Polycelis wutaishanica {{small|Liu, 1993}}
- Polycelis yangchengensis {{small|Dong, Chen, Zhang & Liu, 2017}}
- Polycelis xigazensis {{small|Liu, 1993}}
{{Div col end}}