Pharyngeal jaw

[2][3] Based on connections between musculoskeletal morphology and dentition, diet has been proposed as a main driver of the evolution of the pharyngeal jaw.

[5] These rapid changes are an example of phenotypic plasticity, wherein environmental factors affect genetic expression responsible for pharyngeal jaw development.

These are possibly a response to their inability to swallow as other fishes do by creating a negative pressure in the mouth, perhaps induced by their restricted environmental niche (burrows) or in the air in the intertidal zone.

[12] In the game Hungry Shark Evolution, the character "Big Daddy (Dunkleosteus)" is shown depicting a pharyngeal jaw.

The final boss of Monster Hunter Rise Narwa, as well as her male counterpart Ibushi, both possess pharyngeal jaws within their throats.