Tooth morphology elucidates shark evolution across the end-Cretaceous mass extinction

Mohamad Bazzi, Nicolás Campione, Per Ahlberg, Henning Blom & Benjamin Kear
Sharks (Selachimorpha) are iconic marine predators that have survived multiple mass extinctions over geologic time. Their prolific fossil record is represented mainly by isolated shed teeth, which provide the basis for reconstructing deep time diversity changes affecting different selachimorph clades. By contrast, corresponding shifts in shark ecology, as measured through morphological disparity, have received comparatively limited analytical attention. Here, we use a geometric morphometric approach to comprehensively examine tooth morphologies in multiple shark lineages traversing...
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