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Longisquama
''Longisquama'' is an extinct genus of lizard-like reptile. There is only one species, ''Longisquama insignis'', known from a poorly preserved skeleton and several incomplete fossil impressions from the Middle to Late Triassic Madygen Formation in Kyrgyzstan. It is known from a type fossil specimen; slab and counterslab (PIN 2548/4 and PIN 2584/5), and five referred specimens of possible integumentary appendages (PIN 2584/7 through 9). All specimens are in the collection of the Paleontological Institute of the Russian Academy of Sciences in Moscow.
''Longisquama'' means "long scales"; the specific name ''insignis'' refers to its small size. The ''Longisquama'' holotype is notable for a number of long structures that appear to grow from its skin. These structures have been interpreted as either primitive feathers suggesting ''Longisquama'' is a close relative of birds, or as feather-like structures that have evolved independently and do not indicate a close relationship with birds. ''Longisquama'' has been used in a heavily publicized debate on the origin of birds. To some, ''Longisquama'' is the gliding, cold-blooded, protobird predicted by Gerhard Heilmann's hypothetical "Proavis" in 1927, and it proves that birds are not dinosaurs. The current opinion is that ''Longisquama'' is an ambiguous diapsid and has no bearing on the origin of birds.
==Description==
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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