'The sharklike acanthodians were the first vertebrates with these; earlier ones had vacuum-cleaner mouths'
jaws
PREHISTORIC CRITTERS: The sharklike acanthodians were the first vertebrates with these; earlier ones had vacuum-cleaner mouths
The sharklike acanthodians were the first vertebrates with these; earlier ones had vacuum-cleaner mouths
The sharklike acanthodians were the first vertebrates with these; earlier ones had vacuum-cleaner mouths
PREHISTORIC CRITTERS
jaws
PREHISTORIC CRITTERS