The skull is often elongate and is dorsalventrally flattened; the zygomatic arch is complete, and the mandible is slim and elongated. With the exception of one species that has pre maxillary teeth, and upper teeth are born only on the maxillary bone. The teeth are homodont and nearly cylindrical and very common Both interspecifically and interaspecifically common from 7/7 to 18/19. Frequently, the teeth are partially lossed with advancing age. The axial skeleton is fairly rigid and is partially braced against the Carapus

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