Triodon antiquus was an early pufferfish relative with a highly specialised dental apparatus. The jaws carried repeated stacks of dental plates internally, while small incisiform teeth occurred on the outer face. This arrangement shows a powerful biting system and provides direct evidence that tetraodontiform feeding specialisations were already well developed in the early Eocene.

The exact diet is not preserved, but living triodontids and other pufferfishes use robust jaws to crop or crush resistant food, so hard-shelled invertebrates and other tough prey are plausible. Fossils are mainly jaw elements rather than complete skeletons, making tooth-stack architecture the clearest window into the animal’s biology.