Early Reptile

The small, insect-eating Hylonomus was one of the first reptiles. Living in the Late Carboniferous, it had a scaly skin and shelled eggs that were fertilized before they were laid.

ANAPSID SKULL ►

Early reptiles like Hylonomus had simple "anapsid" skulls with no extra openings to provide anchorage for strong jaw muscles. Tortoises have the same skull type.

Cranium is a solid sheet of bone, with no apertures aside from the large eye sockets
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privai d MODERN REPTiLE

/Lower opening
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