Dimorphodon macronyx (Buckland 1829, Owen 1859) Hittangian, Early Jurassic ~195 mya was one of the first pterosaurs found and described. Derived from a sister to Preondactylus, Dimorphodon phylogenetically preceded Peteinosaurus (MCSNB 3359), but chronologically succeeded it.
Overall larger and distinct from Preondactylus, the skull of Dimorphodon was taller overall with a convex dorsal profile and slender skull elements. The anterior teeth were enlarged. The rear of the skull tilted posteriorly. The maxilla had a more exaggerated convex ventral margin. There was no mandibular fenestra as described below.
The cervicals were slightly larger. Fewer dorsals were present.
The scapulocoracoid was fused. The wing was proportionately larger. Pedal digit IV extended further than the other digits.
There are three fairly complete specimens, BMNH 1034, 1035 and 41212.