Ancestral morphology of crown-group molluscs revealed by a new Ordovician stem aculiferan

@article{Vinther2017AncestralMO,
  title={Ancestral morphology of crown-group molluscs revealed by a new Ordovician stem aculiferan},
  author={Jakob Vinther and Luke Parry and Derek E. G. Briggs and Peter Van Roy},
  journal={Nature},
  year={2017},
  volume={542},
  pages={471-474}
}
Exceptionally preserved fossils provide crucial insights into extinct body plans and organismal evolution. Molluscs, one of the most disparate animal phyla, radiated rapidly during the early Cambrian period (approximately 535–520 million years ago (Ma)). The problematic fossil taxa Halkieria and Orthrozanclus (grouped in Sachitida) have been assigned variously to stem-group annelids, brachiopods, stem-group molluscs or stem-group aculiferans (Polyplacophora and Aplacophora), but their… CONTINUE READING
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