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Colonial origin for Eumetazoa: major morphological transitions and the origin of bilaterian complexity

✍ Scribed by Ruth Ann Dewel

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 661 KB
Volume: 243
Category: Article
ISSN: 0362-2525
DOI: 10.1002/(sici)1097-4687(200001)243:1<35::aid-jmor3>3.0.co;2-#

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✦ Synopsis

A new hypothesis for the evolution of Bilateria is presented. It is based on a reinterpretation of the morphological characters shared by protostomes and deuterostomes, which, when taken together with developmental processes shared by the two lineages, lead to the inescapable conclusion that the last common ancestor of Bilateria was complex. It possessed a head, a segmented trunk, and a tail. The segmented trunk was further disider the fossil record. In fact, the manner in which the last common ancestor of Bilateria evolved and its bearing on the origin of complexity in animals or

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