A fossil revealing the complete side view of the ancient shark Ptychodus, with almost all skeletal elements, was uncovered in Mexico. Courtesy Dr. Jürgen Kriwet Sign up for CNN’s Wonder Theory ...

Revised tentative body outline of 24.3 meters (80 feet) extinct megatooth shark, Otodus megalodon. Important notes: 1) the exact shape, size, and position of most fins remain unknown based on the ...

A new fossil revealing the complete side view of Ptychodus measured nearly 1.5 meters (about 5 feet) in length, suggesting it was from was of a much smaller shark.