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Archaeotrogonidae
''Archaeotrogon'' is a prehistoric bird genus. Its remains have been found in the Quercy Phosphorites of France, a geological formation containing Late Eocene and Early Oligocene deposits. ''Archaeotrogon'' lived some 30-35 million years ago. Not all species described herein may be valid.
This genus has been placed in a distinct family, the Archaeotrogonidae. The Middle Eocene ''Hassiavis'', a more recently described bird from the famous Messel Pit in Germany, might also belong there. In addition, a somewhat enigmatic fossil in the M. Daniels collection, found in the Early Eocene London Clay appears to belong here too.
As the name implies, ''Archaeotrogon'' was initially thought be a prehistoric trogon.〔 However, it is nowadays generally believed that they are not very closely related to these tropical forest birds of our time, but rather convergent. The Archaeotrogonidae actually seem to be Cypselomorphae and related to nightjars and hummingbirds, either as a basal lineage or as a distinct but entirely extinct family. The latter might be more justified than with other indeterminate Cretaceous and Paleogene modern birds: ''Archaeotrogon'' is known from a time when the living cypselomorph families were already distinct, yet appears as well highly autapomorphic and the archaeotrogonid lineage seems to go as far back as that of nightjars for example.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Archaeotrogonidae」の詳細全文を読む
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