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A 40,000-year record of discontinuous evolution of island snails

Published online by Cambridge University Press:  14 July 2015

Satoshi Chiba
Satoshi Chiba*
Affiliation:
Institute of Geosciences, Shizuoka University, Oya, Shizuoka, 422 Japan
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Abstract

The rate and pattern of phenotypic evolution of the endemic land-snail Mandarina chichijimana in the oceanic Bonin Islands through 40,000 years were examined by using radiocarbon-dated fossil specimens. There are drastic variations in rates and patterns of changes detected. Some characters show irregular fluctuation within a restricted range. Other characters show a rapid shift from stasis in one state to stasis in an alternative state. Because of the isolation, the limited distributions, and the presence of transitional forms, these changes are regarded as genuine evolutionary transformations within a lineage. These findings suggest that phyletic evolution is essentially irregular and punctuated.

Type
Articles
Information
Paleobiology , Volume 22 , Issue 2 , Spring 1996 , pp. 177 - 188
Copyright
Copyright © The Paleontological Society 

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