Agassizodontidae
Encyclopedia
The Agassizodontidae are an extinct and poorly known family of bizarre shark
s. They possessed a unique "tooth-whorl" on the symphysis
of the lower jaw as well as pectoral fins supported by long radials.
Shark
Sharks are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago....
s. They possessed a unique "tooth-whorl" on the symphysis
Symphysis
A symphysis is a fibrocartilaginous fusion between two bones. It is a type of cartilaginous joint, specifically a secondary cartilaginous joint.1.A symphysis is an amphiarthrosis, a slightly movable joint.2.A growing together of parts or structures...
of the lower jaw as well as pectoral fins supported by long radials.