The type specimen of "Coloborhynchus" is known only from a partial upper jaw. It can only be distinguished from its relatives by its unique combination of tooth socket positions. In "Coloborhynchus", the two front teeth pointed forward and were higher on the jaw than the other teeth, while the next three pairs of teeth pointed to the sides. The final two pairs of teeth in this specimen point downward. Finally, a unique oval depression was located below the first pair of teeth.