A critical reappraisal of the fossil record of the bilaterian phyla

• It has long been assumed that the extant bilaterian phyla generally have their origin in the Cambrian explosion, when they appear in an essentially modern form. Both these assumptions are questionable, A strict application of stem- and crown-group concept

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Cambrian; Bilateria; functional morphology; plankotrophy; trace fossils; body size; stem groups; phyla; origins; molecular clocks; CAMBRIAN EVOLUTIONARY EXPLOSION; ANIMAL BODY PLANS; 18S RIBOSOMAL DNA; BURGESS SHALE; PHYLOGENETIC SIGNIFICANCE; BRITISH-COL

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