�y��vlog

Fast forward 100 million years, and fish called placoderms swam the seas, with jaws and a primitive “shoulder” or pectoral girdle supporting paired front fins.

They also used measurements of mosasaurs' pectoral girdles from other studies to come up with their hypothesis.

In ray-finned fish, such as catfish, the pectoral girdle is directly attached to the skull and retracts when suction feeding occurs.

For example, "the bones in the pectoral girdle — the bones that support the fins — changed their shape," she says.

Apparently, then, there is not sufficient reason to infer that this Jurassic frog had a pectoral girdle comparable with the modern firmisternal type.