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Halwaxiids and the Early Evolution of the Lophotrochozoans

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Science  02 Mar 2007:
Vol. 315, Issue 5816, pp. 1255-1258
DOI: 10.1126/science.1137187

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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.

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