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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 Gastrotricha

Phylum Gastrotricha

(p.174) 30 Phylum Gastrotricha
Animal Evolution

Claus Nielsen

Oxford University Press

The phylum Gastrotricha consists of roughly 500 described species of microscopic, aquatic animals, and has traditionally been divided into the marine Macrodasyoida and the marine or limnic Chaetonotoida. Hermaphroditism is common to all species, which possess either hermaphroditic gonads or separate testes and ovaries. The embryology of a few species representing both Macrodasyoida and Chaetonotoida has been well documented, and the best known is that of the macrodasyoid Turbanella. Neogossea and Lepidodermella are examples of chaetonotoids. A number of recent studies suggest that Gastrotricha has sister-group relationships with rotifers, gnathostomulids, or platyhelminths.

Keywords:   chaetonotoids, Gastrotricha, Macrodasyoida, Chaetonotoida, hermaphroditism, Turbanella, Neogossea, Lepidodermella, rotifers, gnathostomulids

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