The known skeletal remains of Longisquama lack any other diagnostic archosaurian characters [the furcula mentioned by Jones et al. consists of paired clavicles, as Sharov originally noted], but they exhibit two features, acrodont teeth and an interclavicle ( 3 ), that are typical of lepidosaurs.
2001 March 9, Richard O. Prum with et al., “Longisquama Fossil and Feather Morphology”, in Science, volume 291, number 5510, pages 1899–1902