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–Mikko

—–Original Message—–

A Mesozoic mammal of interest:

Zhe-Xi Luo, Chong-Xi Yuan, Qing-Jin Meng & Qiang Ji (2011)
Jurassic eutherian mammal and divergence of marsupials and placentals.
Nature 476: 442-445
doi:10.1038/nature10291
http://www.nature.com/nature/journal/v476/n7361/full/nature10291.html

Placentals are the most abundant mammals that have
diversified into every niche for vertebrates and
dominated the world’s terrestrial biotas in the Cenozoic.
A critical event in mammalian history is the divergence
of eutherians, the clade inclusive of all living
placentals, from the metatherian-marsupial clade. Here we
report the discovery of a new eutherian of 160 Myr from
the Jurassic of China, which extends the first appearance
of the eutherian-placental clade by about 35 Myr from the
previous record, reducing and resolving a discrepancy
between the previous fossil record and the molecular
estimate for the placental-marsupial divergence. This
mammal has scansorial forelimb features, and provides the
ancestral condition for dental and other anatomical
features of eutherians.

News Stories:
http://www.carnegiemnh.org/press/11-jul-sep/082511fossil.htm
http://www.eurekalert.org/pub_releases/2011-08/cmon-doa081911.php
http://www.pittsburghlive.com/x/pittsburghtrib/news/pittsburgh/s_753170.html