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Nature 417, 841-844 (20 June 2002) | doi:10.1038/nature00805;
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Paired gill slits in a fossil with a calcite skeleton
The chordates, hemichordates (such as acorn worms) and echinoderms (such as starfish) comprise the group Deuterostomia, well established as monophyletic. Among extant deuterostomes, a skeleton in which each plate has the crystallographic structure of a single crystal of calcite is characteristic of echinoderms and is always associated with radial symmetry and never with gill slits.
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