Heteroptychodus

Heteroptychodus is an extinct genus of hybodont that lived in Asia during the Early Cretaceous period. It had low, rounded durophagous teeth that are covered in ridges. Species have been reported from Japan, Mongolia, Malaysia, Thailand, Southern China, and possibly Kyrgyzstan. Fossils have been found in freshwater environments.^[1]

Heteroptychodus Temporal range: Early Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Order:	†Hybodontiformes
Genus:	†Heteroptychodus Yabe and Obata, 1930
Species
†Heteroptychodus chuvalovi †Heteroptychodus kokutensis †Heteroptychodus steinmanni