Eudimorphodon sp. (Wellnhofer 2001, 2003) Late Triassic ~210mya ~8 cm snout to vent length was a tiny pterosaur derived from a sister to Eudimorphodon cromptonellus and phylogenetically preceded Changchengopterus and Sordes. Whether it was a juvenile or a tiny adult cannot be determined. Here the orbit was apparently larger and the rostrum shorter, as might be expected if this were a juvenile archosaur, but these are phylogenetic changes because pterosaurs matured isometrically, not allometrically.
The jugal was not deep and it had a straight ventral rim. The mandible had a low mound-like coronoid process. The teeth retained several cusps.
The triangular sternal complex was small and unable to accommodate more than two ribs. This shape was retained in Dorygnathus.
The pubis was vertically oriented and the actebulum was small and shallow. |
