Cephalic spine

Cephalic spines (head spines) are thought to represent secondary sexual structures found in adult male hybodont sharks, and may have aided in the grasping of a female during copulation.

One or more spines were positioned behind each eye on the cheek area. The tip of the spine often bears a single barb.

Cephalic spines are often found in association with fin spines and teeth of the hybodontid shark Lissodus selachos from the Late Cretaceous Lance Formation of Whyoming.