Summary: Mammalian distal humeri from the Late Cretaceous
STEPHEN G.B. CHESTER, ERIC J. SARGIS, FREDERICK S. SZALAY, J. DAVID ARCHIBALD,
and ALEXANDER O. AVERIANOV
Chester, S.G.B., Sargis, E.J., Szalay, F.S., Archibald, J.D., and Averianov, A.O. 2010. Mammalian distal humeri from the
Late Cretaceous of Uzbekistan. Acta Palaeontologica Polonica 55 (2): 199211.
We describe mammalian distal humeri recovered from the Bissekty Formation, Dzharakuduk, Kyzylkum Desert,
Uzbekistan (90 Ma). Isolated elements were sorted into groups that likely correspond to species (or genera). These groups
were allocated to taxa known mostly from the dentition, petrosals, and/or tarsals at this site. We identified one humerus of
a multituberculate and one of a zalambdalestid. Several eutherian humeri have been tentatively assigned to Zhelestidae
based on their dissimilarity to zalambdalestids and the abundance of zhelestids in the dental record. The zalambdalestids
and zhelestids were probably terrestrial. At least two metatherian taxa have also been identified, and both were likely ar-
boreal. Although the dental record suggests twelve eutherian species and only one metatherian, crurotarsal evidence sup-
ports the presence of at least four metatherian species at Dzharakuduk. The humeri analyzed here also provide support for
the presence of multiple metatherians in the fauna, further demonstrating that postcrania are critical to understanding the
taxonomic diversity present at these Late Cretaceous localities.
Key words: Mammalia, Multituberculata, Metatheria, Zalambdalestidae, Zhelestidae, humerus, Cretaceous, Uzbekistan.
Stephen G.B. Chester [firstname.lastname@example.org], Department of Anthropology, Yale University, P.O. Box 208277, New
Haven, CT 06520, USA;
Eric J. Sargis [email@example.com], Department of Anthropology, Yale University, P.O. Box 208277, New Haven, CT