👉 The term "chaetodontid" is not a recognized scientific term. Chaetodontids are a group of extinct reptiles that lived during the late Cretaceous period, approximately 68 to 72 million years ago. These animals were characterized by their long necks and had large teeth made of keratin, which is a mineral found in the bones of mammals. The discovery of chaetodontids led to the creation of the term "chaetodontid" as a