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Geiseltaliellus : ウィキペディア英語版
Geiseltaliellus

''Geiseltaliellus'' is an extinct genus of iguanian lizards that lived in what is now western Europe during the Eocene. It belongs to the family Corytophanidae, which includes modern casquehead lizards. Many fossils are known from Germany, France, and Belgium, with the most well preserved coming from the Messel pit lagerstätte in Messel, Germany. German paleontologist Oskar Kuhn named the genus in 1944 after the Geiseltal valley where the first specimens were found, designating the type species ''Geiseltaliellus longicaudus''. Three new species — ''G. louisi'', ''G. lamandini'', and ''G. grisolli'' — were named in the 1990s and 2000s on the basis of more fragmentary remains from France and Belgium, although ''G. louisi'' has since been synonymized with ''G. longicaudus''. In 2009 the Messel pit specimens were recognized as belonging to a species distinct from that of the ''G. longicaudus'' specimens in Geiseltalt and were collectively reclassified under a new name, ''G. maarius''.
==Description==
''Geiseltaliellus'' is very similar in appearance to modern corytophanid lizards of the genus ''Corytophanes'' and ''Basiliscus''. One species, ''G. maarius'', even possesses a prominent crest on its head like that of ''Basiliscus''. Well-preserved specimens of ''Geiseltaliellus'' shows that it had a similar scale pattern to living corytophanids, with large scales covering the top of the skull, smaller overlapping scales covering most of the body, and wide scales covering the toes. The tail of ''Geiseltaliellus'' is very long; although corytophanids are known to have long tails in comparison to other lizards, the tail of ''Geiseltaliellus'' is proportionally much longer than those of most other corytophanids, being two to three times the length of the rest of the body. The limbs are proportioned similarly to those of living corytophanids in that the hind limbs are long and the forelimbs are short, adaptations that may have made ''Geiseltaliellus'' an effective jumper and sprinter like the living ''Basiliscus''.〔

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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