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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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HEMICHORDATA

HEMICHORDATA

Chapter:
(p.335) 59 HEMICHORDATA
Source:
Animal Evolution
Author(s):

Claus Nielsen

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199606023.003.0059

The Hemichordata is a group in the animal kingdom that includes the pterobranchs and the enteropneusts, based mainly on the presence of the stomochord. The stomochord has been interpreted as a homologue of the notochord found in the chordates, but the two structures are actually different. Analyses of morphological characters typically show the pterobranchs and enteropneusts as sister groups, whereas molecular phylogeny suggests that the former are an ingroup of the latter, as the sister group of the Harrimaniidae.

Keywords:   pterobranchs, enteropneusts, Hemichordata, stomochord, notochord, chordates, Harrimaniidae

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