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- Title
A second enantiornithean (Aves: Ornithothoraces) wing from the Early Cretaceous Xiagou Formation near Changma, Gansu Province, People's Republic of China.
- Authors
Harris, Jerald D.; Lamanna, Matthew C.; Hai-lu You; Shu-an Ji; Qiang Ji
- 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.
- Subjects
CHINA; ENANTIORNITHIFORMES; FOSSIL birds; HUMERUS; CRETACEOUS paleontology; ULNA; CARPUS (Animal anatomy); BONES; EXTREMITIES (Anatomy)
- Publication
Canadian Journal of Earth Sciences, 2006, Vol 43, Issue 5, p547
- ISSN
0008-4077
- Publication type
Article
- DOI
10.1139/E06-007