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Reference: Lethaia
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  1. Bergström, J., 1989. The Origin of Animal Phyla and the New Phylum Procoelomata.: 259-269.
  2. Yochelson, E.L. & Kisselev, G.N., 2003. Early Cambrian Salterella and Volborthella (Phylum Agmata) re-evaluated.: 8-20.
  3. Huang, D.-Y., Vannier, J. & Chen, J.-Y., 2004. Anatomy and lifestyles of Early Cambrian priapulid worms exemplified by Corynetis and Anningvermis from the Maotianshan Shale (SW China): 21-33.
  4. Hou, X.-G., Ma, X.-Y., Zhao, J. & Bergström, J., 2004. The lobopodian Paucipodia inermis from the Lower Cambrian Chengjiang fauna, Yunnan, China: 235-244.
  5. Bergström, S.M., Chen, X., Gutiérrez-Marco, J.C. & Dronov, A., 2009. The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to δ13C chemostratigraphy: 97-107.
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Last updated: 1 Feb 2024