Polycelis

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Polycelis
Polycelis nigra.jpg
Polycelis nigra
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Platyhelminthes
Order: Tricladida
Family: Planariidae
Genus: Polycelis
Ehrenberg, 1831
Synonyms [1]
  • PolycelidiaLivanov & Zabusova, 1940
  • PolycoelisBeneden, 1861
  • PolyscelisGirard, 1850
  • SorocelidesZabusova, 1929

Polycelis is a genus of planarians in the family Planariidae found in the Holarctic region (North America and Eurasia). [2] [1] The genus was described in 1831 by Christian Gottfried Ehrenberg [1] and currently has no consensus on the exact number of species.

Contents

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). [2]

Habitat

Most species of Polycelis inhabit clean, high-altitudinal streams with water temperatures between 0 and 14 °C in Eurasia and North America. [2]

Species

The following species are recognised in the genus Polycelis: [3]

References

  1. 1 2 3 "Polycelis". Global Biodiversity Information Facility . Retrieved 31 May 2021.
  2. 1 2 3 Sun, XIN-XIN; Wang, LEI; Li, Ning; Sluys, Ronald; Liu, DE-Zeng; Dong, ZI-MEI; Chen, Guang-WEN (2024). "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". Zootaxa. 5536 (4): 581–599. doi:10.11646/zootaxa.5536.4.5. PMID   39646355.
  3. ↑ Tyler S, Schilling S, Hooge M, and Bush LF (comp.) (2006-2025) Turbellarian taxonomic database. Version 2.2
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