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 of 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.

Read more about Longisquama:  Taxonomy, Debate Over Bird Origins

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Drepanosaur - Classification
... studies place them together with the coelurosauravids and Longisquama in a clade called the Avicephala (in Senter's analysis nested within Diapsida ... unnamed Dolabrosaurus Megalancosaurus A clade containing drepanosaurids, Longisquama and Coelurosauravus (as well as Wapitisaurus) was also recovered in an earlier analysis conducted by John Merck (2003 ... Longisquama and Coelurosauravus were not found to be closely related to drepanosaurids, but instead were recovered as non-neodiapsid diapsid as in Senter's (2004 ...
Longisquama - Debate Over Bird Origins - Relationship To Feathered Dromeosaurs
... in a scenario where birds evolved from a Longisquama-like basal archosaur first ... Moreover, if Olshevsky is correct and Longisquama is an early dinosaur, then it may be an ancestor of Microraptor, Longisquama's feathers could be ...