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Science. 2007 Mar 2;315(5816):1255-8.

Halwaxiids and the early evolution of the lophotrochozoans.

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  • 1Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK. sc113@esc.cam.ac.uk

Abstract

Halkieriids and wiwaxiids are cosmopolitan sclerite-bearing metazoans from the Lower and Middle Cambrian. Although they have similar scleritomes, their phylogenetic position is contested. A new scleritomous fossil from the Burgess Shale has the prominent anterior shell of the halkieriids but also bears wiwaxiid-like sclerites. This new fossil defines the monophyletic halwaxiids and indicates that they have a key place in early lophotrochozoan history.

PMID:
17332408
[PubMed - indexed for MEDLINE]
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