What is it about?

We investigated the morphology of the ammonite genus Aegocrioceras to verify that the species recognised within the genus are correct. We found that too many species were designated, and that the genus in fact shows a large morphological variation and potential sexual dimorphism that led to this error. We collapsed part of the wrongly erected species.

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Why is it important?

Ammonites are important for stratigraphic applications. A thorough understanding of their taxonomy is thus essential to derive robust stratigraphic models.


The genus Aegocrioceras and potentially many other ammonite genera have an overblown systematic. More work will have to put into resolving these issues and derive at a data-based, robust taxonomy.

Dr Manuel F. G. Weinkauf
Universite de Geneve

Read the Original

This page is a summary of: Morphological disparity and ontogeny of the endemic heteromorph ammonite genus Aegocrioceras (Early Cretaceous, Hauterivian, NW-Germany), Palaeogeography Palaeoclimatology Palaeoecology, April 2019, Elsevier,
DOI: 10.1016/j.palaeo.2019.01.020.
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