An analysis of the ontogenesis of the chondrocran¡um gives the following homologies in the skull of Lacerta and Chelydra: Chelydra Lacerta Pila metoptica subiculum infundibuli cartilago hypochiasmatica Pila antotica pila antotica pila accessoriaDorsal border of planum supraseptale part of the taenia marginalis closing the fenestra epioptica dorsally Caudal process of the pila antotica dorsal to the incisura prootica part of the taenia marginalis running from the pila antotica to the ear capsule It is shown that the extracranial position of the cavum epiptericum in Lacerta corresponds to the stage of maximal development of the chondrocranium in Chelydra. But further development brings about a dermal sidewall in the orbitotemporal region, built up by descending parietal flanges which incorporate the epipterygoid. This not only allows the pila antotica to degenerate but also incorporates the cavum in the cranial cavity.

Keywords:
Anatomy, Chondrocranium, Embryology, Lizards, Turtles, Reptiles
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© 1976 S. Karger AG, Basel
1976
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