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American Zoologist 1965 5(2):267-276; doi:10.1093/icb/5.2.267
© 1965 by The Society for Integrative and Comparative Biology
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THE RHIPIDISTIAN - AMPHIBIAN TRANSITION

BOBB SCHAEFFER
Dept. of Vertebrate Paleontology, The American Museum of Natural History Department of Zoology, Columbia University New York City

The transition from the rhipidistian crossopterygian fishes to the amphibians involved many changes in morphology, physiology and behavior. The selection pressures promoting terrestrial adaptations and concurrently preserving the aquatic ones must have been responsible for extensive experimentation during the transitional interval. A multiple origin of the amphibian level is therefore regarded as probable, and this view is supported by the diversity of the earliest known amphibian groups.


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