Halwaxiids and the Early Evolution of the Lophotrochozoans
- 2 March 2007
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 315 (5816) , 1255-1258
- https://doi.org/10.1126/science.1137187
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.Keywords
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