Jump to ContentJump to Main Navigation
Animal EvolutionInterrelationships of the Living Phyla$
Users without a subscription are not able to see the full content.

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

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 October 2021

Phylum Enteropneusta

Phylum Enteropneusta

(p.336) 60 Phylum Enteropneusta
Animal Evolution

Claus Nielsen

Oxford University Press

The Enteropneusta is a well-defined phylum consisting of approximately ninety species of burrowing or creeping, marine, worm-like invertebrates. On the basis of morphological characters, Pterobranchia is the sister group of the three or four enteropneust families. However, molecular studies suggest that there are main lineages of enteropneusts: Harrimaniidae and Ptychoderidae. The pterobranchs are considered the sister group of the Harrimaniidae. Four of the genera of the Enteropneusta are Saccoglossus, Glossobalanus, Balanoglossus, and Ptychodera. The Hox genes show a characteristic ‘ambulacrarian signature’. The enteropneusts possess both an axial complex and a series of gill slits, indicating that they are in a key position within the deuterostomes. The enteropneusts, pterobranchs, and echinoderms all have axial complexes with questioned homology.

Keywords:   enteropneusts, pterobranchs, echinoderms, Enteropneusta, Pterobranchia, Harrimaniidae, Ptychoderidae, Hox genes, deuterostomes, axial complexes

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .