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Another enantiornithean wing from China
Apologies in advance if this has been mentioned already...
Jerald D. Harris, Matthew C. Lamanna, Hai-lu You, Shu-an Ji, and Qiang Ji
(2006). A second enantiornithean (Aves: Ornithothoraces) wing from the
Early Cretaceous Xiagou Formation near Changma, Gansu Province, People's
Republic of China. Can. J. Earth Sci. 43 (5): 547-554.
Abstract: "A new specimen of an enantiornithean bird from the Lower
Cretaceous Xiagou Formation of Gansu Province, northwestern China, consists
of an articulated distal left humerus, ulna, radius, carpus, and manus. The
specimen may represent a primitive enantiornithean because it lacks a
longitudinal sulcus on the radius, has incompletely fused alular and major
metacarpals, and possibly retains a remnant of a second phalanx on the minor
digit. It differs from all other known enantiornitheans, and exhibits
possible autapomorphies, including peculiar, flat humeral epicondyles, a
pair of eminences on the distal minor metacarpal, and an enormous flexor
tuberculum on the alular ungual. The specimen probably pertains to the same
taxon as a previously described enantiornithean arm from Changma; the
incompleteness of the taxon precludes erecting a new name, but it provides
new information concerning enantiornithean diversity in the Early Cretaceous
of central Asia."