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Saniwa
''Saniwa'' is an extinct genus of monitor lizards that lived during the Eocene epoch around 48 million years ago. Well-preserved fossils have been found in the Bridger and Green River Formations of Wyoming, and evidence indicates ''Saniwa'' also lived in Europe. The type species ''S. ensidens'' was named in 1870 as the first fossil lizard known from North America. Several other species have since been added, but their validity is uncertain. It is a close relative of ''Varanus'', the genus that includes extant monitor lizards.
==Description==
''Saniwa'' grew to around in length, though ''S. grandis'' could reach 2.15 m (7.1 ft).〔http://www.docstoc.com/docs/84490716/GenusSpecies-Skull-Height-Length-Weight-Stage-Ablepharus--L〕 Like other monitor lizards, ''Saniwa'' has a long, pointed snout and nostrils placed farther back in the skull than most lizards. The tail is almost twice as long as the rest of the body. Although similar in appearance to living monitor lizards, ''Saniwa'' has several primitive traits, including teeth on its palate, a jugal bone beneath the eye that extends farther forward, and a suture between the frontal and parietal bones that is straight rather than curved or wavy.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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