Paired gill slits in a fossil with a calcite skeleton

@article{Dominguez2002PairedGS,
  title={Paired gill slits in a fossil with a calcite skeleton},
  author={P. Dominguez and A. G. Jacobson and R. Jefferies},
  journal={Nature},
  year={2002},
  volume={417},
  pages={841-844}
}
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. Among fossils, however, such a skeleton sometimes occurs without radial symmetry. This is true of Jaekelocarpus… Expand
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