Karaurus and the origin of frogs + salamanders

Karaurus sharovi (Ivachnenko 1978; Late Jurassic; Figs. 1, 2) nests with Celtedens (Fig. 3) in the large reptile tree (LRT, 1467 taxa; Fig. 4)  and resembled living salamanders (Fig. 5) in size, shape and lifestyle. Here (Fig. 2) certain skull bones are reidentified. The orbit was confluent with an upper + lateral temporal fenestra that appeared by the loss of the posterior circumorbital bones.

Post circumorbital bones are also missing,
in Celtedens (Fig. 3). distinct from frogs, like Rana, and salamanders, like Andrias (Fig. 5).

The previous illustration of the giant Chinese salamander skull
(genus: Andrias; Fig. 5) is here updated based in new understandings of homologous bumps and sutures.

References
Ivanchenko KF 1978. Urodelans from the Triassic and Jurassic of Soviet Centra Asia. Paleontological Journal 12(3):362–368.