Atractosteus grandei lived less than 1,500-2,500 years after the Chicxulub asteroid impact, an event that is widely accepted as a major cause behind the end-Cretaceous mass extinction that eradicated roughly 75% of the animal and plant species on Earth, including whole groups like non-avian dinosaurs and ammonites. Skull (a) and partial skeleton (b) of Atractosteus grandei in dorsal view. Scale bars – 4 cm. Image credit: Chase Doran Brownstein...
