👉 Stiassnyiformes is a group of extinct mammals that lived during the Cretaceous period, approximately 68-59 million years ago. They were characterized by their elongated, flattened head and large, pointed teeth, which allowed them to feed on leafy vegetation. The genus includes several species, including the Stiassny's bear (Stiassnyia) and the Stiassny's fox (Cephalophthirius).
