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Cladistic analysis of the Middle Jurassic ammonite radiation

Published online by Cambridge University Press:  21 April 2004

S. MOYNE  and
P. NEIGE
S. MOYNE
Affiliation:
Centre des Sciences de la Terre & UMR CNRS 5561 Biogéosciences, Université de Bourgogne, 6 bd Gabriel, F-21000 Dijon, France
P. NEIGE
Affiliation:
Centre des Sciences de la Terre & UMR CNRS 5561 Biogéosciences, Université de Bourgogne, 6 bd Gabriel, F-21000 Dijon, France
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Abstract

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.

Keywords

phylogenycladisticsammonoidsJurassic
Type
Original Article
Information
Geological Magazine , Volume 141 , Issue 2 , March 2004 , pp. 115 - 123
Copyright
© 2004 Cambridge University Press

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