Ptycholepis
Ptycholepis is an extinct genus of prehistoric ray-finned fish having the head and opercular bones ornamented with ridges of ganoin, minute teeth, and thick scales.
Ptycholepis belongs to the family Ptycholepidae. Other genera of this family are Acrorhabdus, Ardoreosomus, Boreosomus, Chungkingichthys and Yuchoulepis. A typical feature of this family is the dorsal fin, which inserts at the level of the pelvic fins in the front part of the body. Other characters include the striated skull bones and scales, and the small teeth.
