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Animal EvolutionInterrelationships of the Living Phyla$
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Animal Evolution: Interrelationships of the Living Phyla

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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GNATHIFERA

GNATHIFERA

Chapter:
(p.180) 31 GNATHIFERA
Source:
Animal Evolution
Author(s):

Claus Nielsen

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199606023.003.0031

The Gnathifera is a clade that originally comprised Gnathostomulida, Rotifera (known as Syndermata), and new group ‘A’ (Micrognathozoa) based on pronounced similarities of the jaw apparatus called mastax. Molecular analyses suggest that Rotifera and Micrognathozoa are sister groups, and Rotifera and Gnathostomulida as sister groups, but tend to mix them with the Gastrotricha when all three groups are included. All morphological and molecular analyses place the Gnathifera in the Spiralia, but provide little support for a more specific position. Evidence also indicates close relationships with the Gastroticha or the Platyhelminthes. Gnathifera, Gastrotricha, Platyhelminthes, and Cycliophora have been assigned to a group called Platyzoa.

Keywords:   Gnathifera, Rotifera, Micrognathozoa, Gnathostomulida, Gastrotricha, Spiralia, Platyhelminthes, Cycliophora, Platyzoa

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