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Re: Indian (Kallamedu Formation, uppermost Cretaceous) troodontid tooth



From: Ben Creisler
bcreisler@gmail.com


In case some DML members could not read the posting, here's a
plain-text version. Many thanks to Steve for posting.


Indian (Kallamedu Formation, uppermost Cretaceous) troodontid tooth

Hi all,

Stumbled across this paper thanks to Google Scholar's alerts; I don't think
I've seen it posted to the list prior to this:

A. Goswami, G. V. R. Prasad, O. Verma, J. J. Flynn & R. B. J. Benson (2013)
A troodontid dinosaur from the latest Cretaceous of India
Nature Communications 4, 1703.
doi:10.1038/ncomms2716
http://www.nature.com/ncomms/journal/v4/n4/abs/ncomms2716.html

Troodontid dinosaurs share a close ancestry with birds and were distributed
widely across Laurasia during the Cretaceous. Hundreds of occurrences of
troodontid bones, and their highly distinctive teeth, are known from North
America, Europe and Asia. Thus far, however, they remain unknown from
Gondwanan landmasses. Here we report the discovery of a troodontid tooth
from the uppermost Cretaceous Kallamedu Formation in the Cauvery Basin of
South India. This is the first Gondwanan record for troodontids, extending
their geographic range by nearly 10,000 km, and representing the first
confirmed non-avian tetanuran dinosaur from the Indian subcontinent. This
small-bodied maniraptoran dinosaur is an unexpected and distinctly
‘Laurasian’ component of an otherwise typical ‘Gondwanan’ tetrapod
assemblage, including notosuchian crocodiles, abelisauroid dinosaurs and
gondwanathere mammals. This discovery raises the question of whether
troodontids dispersed to India from Laurasia in the Late Cretaceous, or
whether a broader Gondwanan distribution of troodontids remains to be
discovered.

--

--
Dr. Stephen Poropat

Postdoctoral Research Fellow
Uppsala University
Villavägen 16
SE-752 36 Uppsala
Sweden

Research Associate
Australian Age of Dinosaurs
PO Box 408
Winton 4735
Australia