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Callomon J. (2016). On the typological basis of Perisphinctes Waagen, 1869 and the leading modern ammonite superfamily Perisphinctoidea Steinmann, 1890. Volumina Jurassica. 14(1): 1-14.
Callomon J. (2016). On the typological basis of Perisphinctes Waagen, 1869 and the leading modern ammonite superfamily Perisphinctoidea Steinmann, 1890. Volumina Jurassica. 14(1): 1-14.
