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The Origin and Early Evolution of the Craniata

Published online by Cambridge University Press:  17 July 2017

Kevin J. Peterson
Kevin J. Peterson*
Affiliation:
Department of Earth and Space Sciences and IGPP Center for the Study of Evolution and the Origin of Life, University of California, Los Angeles, California 90024-1567
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Extract

The origin of the Craniata (hagfish + Vertebrata [Vertebrata = lamprey + Gnathostoma]—Janvier, 1981), one of the three subphyla of the Phylum Chordata, has generated more controversy in terms of numbers of likely ancestors than the origin of any other metazoan group. The primary difficulty with the origin of craniates, as opposed to the origin of birds, for example, is the bauplan dichotomy that separates craniates from all other “invertebrates.” This dichotomy results in the almost equal plausibility of deriving craniates from any “invertebrate” ancestor. The first attempt at trying to understand the bauplan differences between “invertebrates” and craniates was by Geoffroy St. Hilaire in 1822, who envisioned craniates as arthropods lying on their backs. Since then, many bilaterian phyla have been hypothesized as either direct ancestors or sister groups to the craniates with some recent notable examples being: arthropods (Raw, 1960); nemertines (Willmer, 1975); molluscs (Sillman, 1960; Løvtrup, 1977); urochordates (Jefferies, 1986); and cephalochordates (Gans and Northcutt, 1983).

Type
Research Article
Information
Short Courses in Paleontology , Volume 7: Major Features of Vertebrate Evolution , 1994 , pp. 14 - 37
Copyright
Copyright © 1994 Paleontological Society 

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