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Animal EvolutionInterrelationships of the Living Phyla$
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Claus Nielsen

Print publication date: 2011

Print ISBN-13: 9780199606023

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199606023.001.0001

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Phylum Nemertin

Phylum Nemertin

Chapter:
(p.156) 28 Phylum Nemertin
Source:
Animal Evolution
Author(s):

Claus Nielsen

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199606023.003.0028

The phylum Nemertini, or ribbon worms, consists of about 1,400 described species, most of which are marine (benthic or pelagic). The nemertines are clearly monophyletic and, with the exception of Arhynchonemertes, can be distinguished by the presence of a proboscis. There are two classes according to traditional phylogeny: Anopla (Palaeonemertini + Heteronemertini); and Enopla (Hoplonemertini + Bdellonemertini). Groups with species having pilidium larvae are placed in Pilidiophora, the sister group of the Hoplonemertini (Enopla). The Nemertini is often assumed to be closely related to Annelida, Sipuncula, and Mollusca.

Keywords:   ribbon worms, Nemertini, nemertines, Anopla, Enopla, Pilidiophora, Hoplonemertini, Annelida, Sipuncula, Mollusca

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