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The Biological Bulletin, Vol 197, Issue 3 319-331, Copyright © 1999 by Marine Biological Laboratory

DEVELOPMENT AND REPRODUCTION

Larval Ontogenetic Stages of Chaetopterus: Developmental Heterochrony in the Evolution of Chaetopterid Polychaetes

S. Q. Irvine, O. Chaga and M. Q. Martindale
Committee on Evolutionary Biology, University of Chicago, 1027 E. 57th Street, Chicago, Illinois 60637,

Seven post-gastrulation larval stages are described for the sedentary polychaete Chaetopterus. Analysis of larval anatomy and morphology through ontogeny reveals significant differences in the temporal sequence of segmentation, and in the character of segments formed, from the typical embryological pattern described for other polychaete families, such as nereidids or spionids. When compared in alternative phylogenetic schemes, these differences represent significant developmental heterochrony, among other evolutionary transitions, which has arisen in the chaetopterid lineage. The heterochrony is correlated with the extreme morphological regionalization along the anterior-posterior body axis, a feature that is also characteristic of chaetopterids.


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