Polychaete

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Polychaetes
Fossil range: 530–0 Ma
Cambrian (or earlier?) - present
"A variety o marine wirms": plate frae Das Meer bi M.J. Schleiden (1804–1881).
"A variety o marine wirms": plate frae Das Meer bi M.J. Schleiden (1804–1881).
Scientific classification
Kingdom: Animalia
Phylum: Annelida
Class: Polychaeta
Grube, 1850
Included groups

Palpata
Scolecida

Cladistically included but traditionally excluded groups

Echiura
Chaetopteridae[1]

The Polychaeta or polychaetes are a paraphyletic[1] cless o annelid wirms, generally marine. Each bouk segment haes a pair o fleshy protrusions cried parapodia that bear mony bristles, cried chaetae, which are made o chitin. As such, polychaetes are whiles referred to as bristle wirms. Mair nor 10,000 species are descrived in this cless. Common representatives include the lugwirm (Arenicola marina) an the sandworm or clam wirm Alitta.

References[eedit | eedit soorce]

  1. 1.0 1.1 Struck, T. H.; Paul, C.; Hill, N.; Hartmann, S.; Hösel, C.; Kube, M.; Lieb, B.; Meyer, A.; Tiedemann, R.; Purschke, G. N.; Bleidorn, C. (2011). "Phylogenomic analyses unravel annelid evolution". Nature. 471 (7336): 95–98. doi:10.1038/nature09864. PMID 21368831.