clade that includes bony fish and the land and marine tetrapods

Euteleostomi is the largest group of Vertebrates. Except for hagfish, lampreys, and cartilaginous fishes all vetebrates are part of this group. All Euteleostomi have a skeleton made of bone, and a skull. In the case of several fish related to the sturgeon, most of the skeleton has again been transformed to cartilage.

Skeleton of a bat.