Two skulls which were assigned to the genus Rhabdognathus but which could not be shown to be identical to R. rarus were given new species: R. aslerensis and R. keiniensis, both from Mali.

[4] Rhabdognathus has an extremely elongated snout that makes up around 75% of the length of the entire skull.

The alveoli of Rhabdognathus are rounded and directed slightly laterally, causing the teeth to project at an angle.

[3] The skulls of R. aslerensis and R. keiniensis possess numerous characters that distinguish Rhabdognathus from other dyrosaurids.

[7] In both species of Rhabdognathus, the space between the occipital condyle and the basioccipital tubera (both located in the back of the skull where the vertebrae articulate) is anteroposteriorly longer than in D. phosphaticus.