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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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Animal Evolution

Claus Nielsen

Oxford University Press

The Panarthropoda is a group of segmented ecdysozoans arranged into three phyla: Arthropoda, Onychophora, and Tardigrada. The panarthropods are almost unanimously regarded as monophyletic, and possess paired appendages and a cuticle containing a-chitin and protein, but no collagen. There are two main groups of panarthropod fossils: ‘lobopods’ and stem-group arthropods. Little is known about the morphology and life cycle of the panarthropod ancestor, with the embryology of tardigrades and onychophorans offering no clue. Almost all recent analyses, based on mitochondrial genomes, expressed sequence tag data, and phylogenomics indicate that onychophorans and arthropods are sister groups, although the position of the tardigrades remains uncertain.

Keywords:   panarthropods, Panarthropoda, ecdysozoans, Arthropoda, Onychophora, Tardigrada, lobopods, arthropods, tardigrades, onychophorans

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