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Icaronycteris
''Icaronycteris'' is an extinct genus of microchiropteran (echolocating) bat that lived in the early Eocene, approximately , making it the earliest known definitive bat. Four exceptionally preserved specimens, among the best preserved bat fossils, are known from the Green River Formation of North America.〔 There is only one thoroughly described species of bat in the genus, ''I. index'', although fragmentary material from France has also been tentatively placed within ''Icaronycteris'' as the second species ''I. menui''.
''I. sigei'' is based on well-preserved fragments of dentaries and lower teeth found in Western India.
==Description==
''Icaronycteris''〔The name relates the mythic flight of Icarus to ''Nycteris'', the genus of "hollow-faced bats".〕 measured about long and had a wingspan of . It closely resembled modern bats, but had some primitive traits. The tail was much longer and not connected to the hind legs with a skin membrane, the first wing finger bore a claw and the body was more flexible. Similarly, it had a full set of relatively unspecialised teeth, similar to those of a modern shrew. Its anatomy suggests that, like modern bats, ''Icaronycteris'' slept while hanging upside down, holding onto a tree branch or stone ridge with its hind legs.
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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