CONICET | Buscador de Institutos y Recursos Humanos

The craneal and poscranial skeleton development of Liolaemus scapularis (Iguania: Tropiduridae) was studied. The observations are based on four embryos and one hatched specimen. Here the fully developed chondrocranium, the cranial and poscranial sequences of ossification were described. In the chondrocranium the taenia marginalis shows intraspecific variation closing or not the epioptic fenestra. The pila antótica is reduced, making both fenestra prootica and metóptica fused. Among the most interesting features of the osteocranium development we can remark the earlier ossification of the cranium relative to the poscranium; the first bone that arises it ossification is the ptrygoid; the ossification of the whole of the dermal mandibular bones occurs between the first two weeks after the clutch; the presence of 60% of the skull bones at 34A stage was verified; in the same stage nearly the totality of dermal bones are present (14/16); prevomers, nasals and posfrontals begin to ossify at the next stage; Supraoccipital, epipterygoid and articular ossify before any other chondral element at 35.

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