Ammonite, Heteromorph (1)

Irregularly-coiled ammonites are a later evolutionary stage of ammonite, called heteromorph (different-shaped) ammonites, in contrast to regularly coiled ammonites, which are called homomorph (same-shaped) ammonites. Heteromorph ammonites are an excellent example of adaptive radiation, where a single lineage rapidly diversified into a wide variety of forms to exploit different ecological niches. Heteromorph ammonites, like other ammonites, were generally predators or scavengers, feeding on smaller marine organisms. Their diverse shell shapes suggest a variety of ecological roles and adaptations. Heteromorph ammonites, like all ammonites, became extinct at the end of the Cretaceous period, around 66 million years ago, during the mass extinction event that also wiped out the dinosaurs.

Country of Origin: Madagascar
Size: 95mm x 57mm
Age: Cretaceous

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