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Geological Magazine; March 2004; v. 141; no. 2; p. 115-123; DOI: 10.1017/S0016756804009082
© 2004 Cambridge University Press (CUP)
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Article

Cladistic analysis of the Middle Jurassic ammonite radiation

S. MOYNE and P. NEIGE*

Centre des Sciences de la Terre & UMR CNRS 5561 Biogéosciences, Université de Bourgogne, 6 bd Gabriel, F-21000 Dijon, France

* Author for correspondence: Pascal.Neige{at}u-bourgogne.fr

Cladistic analysis of the Middle Jurassic ammonite radiation shows how the Aalenian-age ancestral stock, known variously as the Hammatocerataceae or Hammatoceratinae, gave rise to numerous new groups in Bajocian times. Cladistic analysis shows this ancestral stock is not a single lineage but two: the ‘Erycites group’, which gave rise to the Stephanocerataceae, and the ‘Hammatoceras group’, from which all other Bajocian groups derived.

Key Words: phylogeny • cladistics • ammonoids • Jurassic






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