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Project 4774: C. D. Sumrall, C. E. Brett. 2002. A Revision of Novacystis Hawkesi Paul and Bolton 1991 (Middle Silurian: Glyptocystitida, Echinodermata) and the Phylogeny of Early Callocystitids. Journal of Paleontology. 76 (4):733.
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