Ctenochasma elegans, a pterosaur Stegosaurus The teeth had slight keels

The teeth had slight keels on their leading and posterior sides

which he named Archaeopteryx bavarica

is one of the largest known skulls for any machairodont

though they are animals

and which may have been used for species or sexual identification

Ctenochasma elegans, a pterosaur Stegosaurus The teeth had slight keelsCtenochasma is distinguished mainly by its numerous (over 400 in adults) long, thin, curved and closely packed teeth, which lined its elongated and narrow snout. The teeth were so closely packed that they formed a comb, and in adults they projected outward away from the jaws, forming a basket; traditionally, these are thought to indicate a filter feeding lifestyle, straining water through the teeth in order to capture and eat small invertebrates, but