Some males have horns on their left mandibles to dislodge rival males.

The holotype is the anterior portion of the left mandible, from the symphysis to the splenial bone and containing portions of the coronoid.

It consists of a partial left mandible with teeth.

It was represented by a small bone fragment that is probably part of the left mandible of a temnospondyl amphibian.

Track goes in through the sternocleidomastoid, through the base of the tongue and out through the left mandible.

The missile punched a hole through the left mandible.

A surplus molar in the left mandible.

The left mandible is larger, and forms a narrow stylet used to pierce the cell wall of tissues.

In this order only the left mandible is present, modified into a stylet.

Apparently, the left and right mandibles have rotated inwards towards each other on biting.