👉 Synododonts are a group of extinct mammals that lived during the Cretaceous period, approximately 65 million years ago. These animals were known for their unique teeth and jaw structure, characterized by their triangular shape and sharp incisors on the upper jaw. The term "synodontoidei" is derived from the Greek words for "triangular" and "incisor," suggesting that these mammals had triangular-shaped incisors that enhanced their ability to chew and break down tough meat.