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:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | †Hybodontiformes |
| Genus: | †Heteroptychodus Yabe and Obata, 1930 |
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References
edit- ^ Teng, Yu He; Sone, Masatoshi; Hirayama, Ren; Yoshida, Masataka; Komatsu, Toshifumi; Khamha, Suchada; Cuny, Gilles (2019-01-02). "First Cretaceous fish fauna from Malaysia". Journal of Vertebrate Paleontology. 39 (1): e1573735. doi:10.1080/02724634.2019.1573735. ISSN 0272-4634.
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