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The last common bilaterian ancestorMany regulatory genes appear to be utilized in at least superficially similar ways in the development of particular body parts in Drosophila and in chordates. These similarities have been widely interpreted as functional homologies, producing the conventional view of the last common protostome-deuterostome ancestor (PDA) as a complex organism that possessed some of the same body parts as modern bilaterians. Here we discuss an alternative view, in which the last common PDA had a less complex body plan than is frequently conceived. This reconstruction alters expectations for Neoproterozoic fossil remains that could illustrate the pathways of bilaterian evolution.
Document ID
20040088270
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Erwin, Douglas H.
(National Museum of Natural History Washington, D.C. 20560, United States)
Davidson, Eric H.
Date Acquired
August 21, 2013
Publication Date
July 1, 2002
Publication Information
Publication: Development (Cambridge, England)
Volume: 129
Issue: 13
ISSN: 0950-1991
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Review
NASA Discipline Exobiology
Review, Tutorial
NASA Discipline Evolutionary Biology
Non-NASA Center

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