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Phyletic gradualism in the Globorotalia inflata lineage vindicated

Published online by Cambridge University Press:  08 April 2016

Björn A. Malmgren  and
James P. Kennett
Björn A. Malmgren
Affiliation:
Department of Paleontology, University of Uppsala, Box 558, S-751 22 Uppsala, Sweden
James P. Kennett
Affiliation:
Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882
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Extract

We appreciate Dr. Scott's comments about our paper (Malmgren and Kennett 1981), but wish to clarify some aspects which we hope will help provide a better understanding about the Late Neogene evolution of the Globorotalia (Globoconella) group (Kennett and Srinivasan 1983). We also wish to dispute some of Scott's other criticisms. In effect, Scott's arguments have provided no reason to justify abandonment of our initial contention that this lineage represents one of the best documented cases of phyletic gradualism in any group of fossils.

We support Scott's notion that divergence of the lineage took place near the Miocene-Pliocene boundary, but this divergence is not relevant for our evolutionary study. In fact, the Early Pliocene form resembling Globorotalia conoidea was already recognized by one of us (J.P.K.) 10 yr ago (Kennett 1973). It was distinguished as G. cf. conoidea and not G. conoidea as stated by Scott. In our previous papers (Malmgren and Kennett 1981, 1982) we confined our attention to the evolution that occurred in the primary temperate stock (cool subtropical) water mass—the abundant and dominant forms of Globoconella.

Type
Articles
Information
Paleobiology , Volume 9 , Issue 4 , Fall 1983 , pp. 427 - 428
Copyright
Copyright © The Paleontological Society 

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References

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