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The Chondrocranium Development of Stenodactylus slevini (Squamata: Gekkonidae) I. Stage I

Mai A Al-Mosaibih and Samar MH Sulaiman

This study descriptions of the development the chondrocranium in Stenodactylus slevini (Squamata: Gekkonidae), Chondrocranium cartilage is one of the important things for evolution of the vertebrate head. The stage of embryo development was determined by length 21.1 mm, based on the hatched embryo, and cleared and double- stained specimens. it has been used reconstructions by serial sections to formation and description in some regions: the olfactory region, orbital region, floor of the neurocranium and auditory region. the olfactory region in this stage is reduce developed and the fenestra olfactoria is to large, the cupola anterior and parietotectal cartilage and paranasal cartilage connected to each other, sphenethmoid commissure also reduced development, present a features Jacobson's organ, it's chemical sensory organ that transfers pheromones to transmit signals between one species. The planum supraseptale is not yet formed but medial and lateral portion of planum supraseptal present. In addition, the Taenia marginalis, taenia medialis, and pila metoptica that represent the roof of chondrocranium. The auditory capsule is small and reduced developed, they are no connected with each other because the tectum synoticum is absent.