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Chaoyangodens, eutriconodont mammal from Cretaceous of China (free pdf)



From: Ben Creisler
bcreisler@gmail.com


A recent paper not yet mentioned on the DML:


Shilin Hou & Jin Meng (2013)
A new eutriconodont mammal from the early Cretaceous Jehol Biota of
Liaoning, China.
Chinese Science Bulletin 59(5-6): 546-553
DOI: 10.1007/s11434-013-0088-2
http://link.springer.com/article/10.1007%2Fs11434-013-0088-2

A new genus and species of eutriconodont mammal, Chaoyangodens lii
gen. et sp. nov., from the Dawangzhangzi bed of Yixian Formation,
Lingyuan, Liaoning, is reported. The new species has a tooth formula
I5-C1-P1-M3/i4-c1-p1-m4, unique among eutriconodonts in having only
one premolar in lower and upper jaws, respectively, and a distinctive
diastema between the canine and the premolar. Its simple incisors and
reduced premolars show a mosaic combination of primitive and derived
features. This new taxon adds to the diverse group of Jehol
eutriconodonts. Among the known species from at least three horizons,
there seems no evolutionary trend in morphology that is recognizable,
except for that larger species are all from the Lujiatun bed of the
Yixian Fm. A thorough and systematic analysis involving all the Jehol
eutriconodonts is needed to understand their phylogenetic
relationships.