See text Coelodus is an extinct genus of marine and possibly freshwater pycnodont fish.

[2] Other species from the Late Jurassic to the Eocene have also been attributed to this genus based on isolated dental elements, but their assignment to Coelodus is uncertain, and this genus likely represents a non-monophyletic wastebasket taxon.

A potential diagnostic trait is a prearticular tooth row with three regular highly elongated teeth.

achillis (Costa 1853), C. discus Heckel 1856, C. grandis (Costa 1855), C. pyrrhurus Heckel, 1854) C. subdiscus Wenz, 1989, C. rosadoi Silva Santos, 1963 and C. toncoensis Benedetto & Sanchez ,1972 have since been reclassified into the genera Ocloedus and Costapycnodus, and many of these dentition-only taxa may belong there instead.

[10] It is possible that freshwater and brackish environments served as refugia for Coelodus, allowing for it to survive the Cretaceous-Paleogene extinction event.