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Parapuzosia seppenradensis
''Parapuzosia seppenradensis'' is the largest known species of ammonite.〔Payne, J.L., A.G. Boyer, J.H. Brown, S. Finnegan, M. Kowalewski, R.A. Krause, Jr., S.K. Lyons, C.R. McClain, D.W. McShea, P.M. Novack-Gottshall, F.A. Smith, J.A. Stempien & S.C. Wang 2009. Two-phase increase in the maximum size of life over 3.5 billion years reflects biological innovation and environmental opportunity. ''PNAS'' 106(1): 24–27. 〕 It lived during the Late Cretaceous period. A specimen found in Germany in 1895 measures in diameter, although the living chamber is incomplete. It is estimated that if complete, this specimen would have had a diameter of approximately 〔 Landois, H. 1895. (Die Riesenammoniten von Seppenrade, ''Pachydiscus'' Zittel ''Seppenradensis'' H. Landois ). ''Jahresbericht des Westfälischen Provinzial-Vereins für Wissenschaft und Kunst'' 23: 99–108.〕 or even .〔Teichert, C. & B. Kummel 1960. (Size of endoceroid cephalopods ). ''Breviora Museum of Comparative Zoology'' 128: 1–7.〕 The total live mass has been estimated at , of which the shell would constitute .〔
==See also==
*Cephalopod size
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