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The earliest known eutherian mammal.
Nature. 2002 Apr 25; 416(6883):816-22.Nat

Abstract

The skeleton of a eutherian (placental) mammal has been discovered from the Lower Cretaceous Yixian Formation of northeastern China. We estimate its age to be about 125 million years (Myr), extending the date of the oldest eutherian records with skull and skeleton by about 40 50 Myr. Our analyses place the new fossil at the root of the eutherian tree and among the four other known Early Cretaceous eutherians, and suggest an earlier and greater diversification of stem eutherians that occurred well before the molecular estimate for the diversification of extant placental superorders (104 64 Myr). The new eutherian has limb and foot features that are known only from scansorial (climbing) and arboreal (tree-living) extant mammals, in contrast to the terrestrial or cursorial (running) features of other Cretaceous eutherians. This suggests that the earliest eutherian lineages developed different locomotory adaptations, facilitating their spread to diverse niches in the Cretaceous.

Authors+Show Affiliations

Chinese Academy of Geological Sciences, Beijing 100037, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

11976675

Citation

Ji, Qiang, et al. "The Earliest Known Eutherian Mammal." Nature, vol. 416, no. 6883, 2002, pp. 816-22.
Ji Q, Luo ZX, Yuan CX, et al. The earliest known eutherian mammal. Nature. 2002;416(6883):816-22.
Ji, Q., Luo, Z. X., Yuan, C. X., Wible, J. R., Zhang, J. P., & Georgi, J. A. (2002). The earliest known eutherian mammal. Nature, 416(6883), 816-22.
Ji Q, et al. The Earliest Known Eutherian Mammal. Nature. 2002 Apr 25;416(6883):816-22. PubMed PMID: 11976675.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The earliest known eutherian mammal. AU - Ji,Qiang, AU - Luo,Zhe-Xi, AU - Yuan,Chong-Xi, AU - Wible,John R, AU - Zhang,Jian-Ping, AU - Georgi,Justin A, PY - 2002/4/27/pubmed PY - 2002/5/8/medline PY - 2002/4/27/entrez SP - 816 EP - 22 JF - Nature JO - Nature VL - 416 IS - 6883 N2 - The skeleton of a eutherian (placental) mammal has been discovered from the Lower Cretaceous Yixian Formation of northeastern China. We estimate its age to be about 125 million years (Myr), extending the date of the oldest eutherian records with skull and skeleton by about 40 50 Myr. Our analyses place the new fossil at the root of the eutherian tree and among the four other known Early Cretaceous eutherians, and suggest an earlier and greater diversification of stem eutherians that occurred well before the molecular estimate for the diversification of extant placental superorders (104 64 Myr). The new eutherian has limb and foot features that are known only from scansorial (climbing) and arboreal (tree-living) extant mammals, in contrast to the terrestrial or cursorial (running) features of other Cretaceous eutherians. This suggests that the earliest eutherian lineages developed different locomotory adaptations, facilitating their spread to diverse niches in the Cretaceous. SN - 0028-0836 UR - https://www.unboundmedicine.com/medline/citation/11976675/The_earliest_known_eutherian_mammal_ L2 - https://doi.org/10.1038/416816a DB - PRIME DP - Unbound Medicine ER -