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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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Prelude: Phylum Choanoflagellata

Prelude: Phylum Choanoflagellata

Chapter:
(p.13) 3 Prelude: Phylum Choanoflagellata
Source:
Animal Evolution
Author(s):

Claus Nielsen

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199606023.003.0003

Comprised of only about 200 species, the Choanoflagellata is a small phylum that occurs in most aquatic habitats. Choanoflagellates are unicellular, solitary, or colony-forming ‘flagellates’ without chloroplasts, and are either pelagic or sessile. They reproduce by binary fission, and sexual reproduction is implied by the presence of conserved meiotic genes. In addition, choanoflagellates have a complicated life cycle. Their sister-group relationship with metazoans is supported by morphological and molecular evidence.

Keywords:   choanoflagellates, Choanoflagellata, binary fission, sexual reproduction, meiotic genes, life cycle, metazoans

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