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Science 29 April 1983:
Vol. 220. no. 4596, pp. 501 - 502
DOI: 10.1126/science.220.4596.501
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Articles

Modes of Larval Development and Rates of Speciation in Early Tertiary Neogastropods

THOR A. HANSEN 1

1 Department of Geological Sciences, University of Texas, Austin 78712

Although most warm-water molluscs have planktotrophic larval stages, some living families of tropical neogastropods are dominated by nonplanktotrophic development. Fossil protoconchs of early Tertiary neogastropods indicate that some families became progressively dominated by nonplanktotrophic development through time. This trend may be the result of higher speciation rates for nonplanktotrophs and a unidirectional trend in developmental change.

Submitted on March 11, 1982
Revised on October 19, 1982


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Science. ISSN 0036-8075 (print), 1095-9203 (online)