[D] Yixianosaurus longimanus [sG] [T]
Xu & Wang, 2003
Saurischia Theropoda Tetanurae Coelurosauria Maniraptora
Yixian Formation, Jehol Group of Liaoning, China
Genus - Typespecies
Diagnostic features of include manus 140% as long as humerus, manual phalanx II-2 longer than metacarpal II, manual phalanx III-3 244% as long as phalanx III-1, and manual phalanx III-2 bearing a proximoventral heel. With the integuments preserved on the holotype specimen, Yixianosaurus longimanus represents the ninth feathered dinosaur species reported from western Liaoning. The elongated penultimate phalanges of Yixianosaurus longimanus indicate an improved grasping capability and might represent an adaptation to the arboreal habit.
IVPP V12638: partial postcranial skeleton; both nearly-complete scapula (the right is missing the ventral margin and glenoid area, the left ispreserved showing only the ventral edge and not preserved in side view, missing the distal end), both coracoids, complete right and partial left humeri (missing the distal end), complete right and partial left ulnae and radii (missing the proximal ends), complete left carpus, partial right (missing much of the surface and the proximal ends) and complete left metacarpus, nearly complete left and right manus, lacking only left phalanx mdIII-1, proximal mdIII-2, distal second claw, and most of the proximal right second claw; several portions of left and right ribs, including proximal portions and shafts, and three pairs of ?middle gastralia and another right gastrale. Integument is found on the right arm and extends about 50mm from the ulna in the best preserved region, where the ulna is 64mm in length.