@futurebird Oh God, it's following me now.
Visited the Cleveland Museum of Natural History for the first time this weekend and they have fossils of that fish in five different places. It's IIUC the state fish fossil.
I swear, every time we turned around, it was staring at us. I'm going to remember "The Dunkleosteous had a self-sharpening beak" like I remember the mitochondria is the powerhouse of the cell.