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Anthracolestes, new dryolestid mammal from Jurassic of Siberia
A paper in the new JVP:
Alexander O. Averianov, Thomas Martin & Alexey Lopatin (2014)
The oldest dryolestid mammal from the Middle Jurassic of Siberia.
Journal of Vertebrate Paleontology 34(4): 924-931
Anthracolestes sergeii, gen. et sp. nov., based on three isolated
lower molars and several edentulous dentary fragments from the Middle
Jurassic (Bathonian) Itat Formation at Berezovsk Quarry in Krasnoyarsk
Territory, Russia, is the oldest and most basal representative of
Dryolestidae. It shows four unambiguous synapomorphies of
Dryolestidae: lower molars with unilaterally hypsodont crowns, unequal
roots, and pronounced precingulid instead of cusp f, and dentary with
unequal alveolar borders. The dental formula of the new taxon is i1–4,
c (double-rooted), p1–4(?), and m1–4(?). Anthracolestes sergeii, gen.
et sp. nov., is plesiomorphic relative to more derived and
geologically younger dryolestids in having possibly fewer lower
molars, less pronounced mesiodistal compression of lower molars,
oblique protocristid, short mandibular symphysis, and shallow
mandibular ramus of the dentary. Asia is most likely the place of
origin for Dryolestidae, but this group is so far not known from that
continent after the Middle Jurassic.