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Evolution of the Bilaterian Body Plan: What Have We Learned from Annelids?

Marty Shankland and Elaine C. Seaver
Proceedings of the National Academy of Sciences of the United States of America
Vol. 97, No. 9 (Apr. 25, 2000), pp. 4434-4437
Stable URL: http://www.jstor.org/stable/122407
Page Count: 4
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Evolution of the Bilaterian Body Plan: What Have We Learned from Annelids?
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Abstract

Annelids, unlike their vertebrate or fruit fly cousins, are a bilaterian taxon often overlooked when addressing the question of body plan evolution. However, recent data suggest that annelids offer unique insights on the early evolution of spiral cleavage, anteroposterior axis formation, body axis segmentation, and head versus trunk distinction.

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