👉 Ptychopariidae is a group of extinct chitinous fish that lived during the Early Cretaceous period (about 69-74 million years ago). They are named after their distinctive, often triangular-shaped body and often have a black and white stripe on the sides. Ptychopariids were primarily carnivorous, and they had a long, slender tail, which allowed them to swim efficiently through water. Ptychopariids were also known for