Fossils of this armour-plated fish have been found in locations such as in Russia, the Michigan Basis,[2] and Arizona, United States.

[4] Through time, an evolutionary morphological trait is that the species within Ptyctodontidae reduce the dermal armour.

[6] Just like the other members of the family of Ptyctodontidae, there is a sexual dimorphism between the genders of Ptyctodus in the pelvic region where the characteristics are different; males had claspers, while females had large scale like pelvic fins along with their endoskeleton.

[8] Ptyctodus lived in a nektonic carnivore type-ecology and in carbonate, lagoonal, and shallow subtidal environments.

[1] Due to structure and shape of the teeth Ptyctodus would easily be able to crush shellfish like organisms at the bottom of the ocean floors, feeding mainly off of that.