Dibothrosuchus elaphros (Early Jurassic, Simmons 1965; Wu and Chatterjee 1993) is known from an incomplete skeleton, lacking hind limbs and distal tail. So we don't know whether this was a biped or quadruped, but it nests at the base of bipeds and was derived from bipeds. Derived from a sister to Junggarsuchus , Dibothrosuchus was basal to Gracilisuchus and several small bipedal crocodylomorphs.
As in descendant taxa, the rostrum was perforated between the premaxilla and maxilla. The lateral temporal fenestra was elaborated with a quadrate that had three dorsal heads for a strong articulation with the skull roof. The cervicals and their ribs were quite robust. As in few other tetrapods, the cervicals and their ribs were deeper than the skull. The proximal carpals were longer than the metacarpals. |
