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1 March 2008
A Redescription of a Rare Chordate, Metaspriggina walcotti Simonetta and Insom, from the Burgess Shale (Middle Cambrian), British Columbia, Canada
Simon Conway Morris
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Journal of Paleontology
Vol. 82 • No. 2
March 2008
Vol. 82 • No. 2
March 2008