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Volumn 302, Issue 5652, 2003, Pages 1934-1940

An Early Cretaceous Tribosphenic Mammal and Metatherian Evolution

Author keywords

[No Author keywords available]

Indexed keywords

BIODIVERSITY; ECOSYSTEMS;

EID: 0348017151     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1090718     Document Type: Article
Times cited : (334)

References (50)
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    • note
    • Etymology: Sino (Latin), China; delphys (Greek), uterus, commonly used suffix for marsupial taxa; szalayi, in honor of F. S. Szalay for his studies of metatherian evolution. Systematics; Class Mammalia, Subclass Metatheria, Order and Family incertae sedis. Holotype: CAGS00-IG03 (Fig. 1; Chinese Academy of Geological Sciences, Institute of Geology), an incomplete, flattened skeleton with some preserved soft tissues, such as costal cartilages and fur, on a shale slab; parts of hindlimb, pes, and shoulder girdle preserved on fragments of a counterslab. Locality and age: lacustrine beds of the Yixian Formation at the Dawangzhangzi Locality, Lingyuan County, Liaoning, China. The locality is correlated with the main fossiliferous horizon of the Yixian at the Sihetun site that was dated as 124.6 Ma (12) in the lower Barremian stage of the Lower Cretaceous.
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    • note
    • Diagnosis: Upper 14, C1, P4, M4; lower i4, c1, p4, m3 (Fig. 1). Sinodelphys szalayi differs from most mammaliaforms (2), eutriconodonts (8, 9), and multituberculates (2, 11) in having triangulated molar cusps; differs from zhangheotheriids and all pretribsophenic mammals in having a tricuspate talonid basin; differs from all known eutherians in having compressed, lanceolate posterior incisors, four (instead of three) upper molars, and apomorphies of the ankle and wrist; and differs from all known metatherians in dental formula. For full differential diagnosis, see (14).
  • 14
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    • note
    • For an expanded diagnosis, identification of skeletal structure, character list, taxa/character matrix, and results of phylogenetic analyses, see supporting data on Science Online.
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    • F. S. Szalay, M. J. Novacek, M. C. McKenna, Eds. (Springer-Verlag, New York)
    • R. L. Cifelli, in Mammal Phylogeny, F. S. Szalay, M. J. Novacek, M. C. McKenna, Eds. (Springer-Verlag, New York, 1993), vol. 1, pp. 205-215.
    • (1993) Mammal Phylogeny , vol.1 , pp. 205-215
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    • note
    • We thank K. C. Beard, R. L. Cifelli, M. R. Dawson, Z. Kielan-Jaworowska, J. A. Lillegraven, M. J. Novacek, G. W. Rougier, and M. Sánchez-Villagra for many discussions that are relevant to this research; R. L. Cifelli and M. R. Dawson for improving the paper; A. Henrici and A. R., Tabrum for preparation; and M. Klingler for illustration of Fig. 1. Supported by NSF (USA) (Z.-X.L. and J.R.W.), the Ministries of Land Resources and Science and Technology of the People's Republic of China (Q.J.), NSFC (China) and the National Geographic Society (Z.-X.L.), and the Carnegie Museum of Natural History (Z.-X.L. and J.R.W.).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.