6533b7cefe1ef96bd1256edc

RESEARCH PRODUCT

Cladistic analysis of the Middle Jurassic ammonite radiation

Pascal NeigeS. Moyne

subject

AmmonitePaleontologylanguageGeologyBiologylanguage.human_languageCladistics

description

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.

https://doi.org/10.1017/s0016756804009082