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. (1981) Pravitoceras sigmoidale Yabe ( ). ( : Matsumoto T., Morozumi Y., Bando Y., Hashimoro H., Macsuoka A. 1981. Note on Pravitoceras sigmoidale Yabe (Cretaceous heterornorph ammonite). Transactions and Proceedings of the Palaeontological Society of Japan. New Series, vol.1981, no.123, pp.168-178, pls.22-26.)



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