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Biodiversity of dinosaurs before K/T extinction

From: Ben Creisler

A couple of recent papers not yet mentioned on the DML:

Jean Le Loeuff (2012)
Paleobiogeography and biodiversity of Late Maastrichtian dinosaurs:
how many dinosaur species went extinct at the Cretaceous-Tertiary
Bulletin de la Société Géologique de France 183(6): 547-559
doi: 10.2113/gssgfbull.183.6.547

The global Late Maastrichtian non-avian dinosaur apparent biodiversity
is extensively surveyed for the first time. It amounts to 104 species
(including unnamed forms) in 2010. The real biodiversity being
obscured by taphonomical biases and the scarcity of the continental
fossil record, a species-area relationship is used to estimate it. The
results show that several hundreds (between 628 and 1078) non-avian
dinosaur species were alive in the Late Maastrichtian, which is almost
an order of magnitude above previous estimates. Because of the complex
Late Cretaceous palaeobiogeography, discussions about dinosaur
extinction should be based on this estimated real global biodiversity,
not on the apparent biodiversity of a single area. Given the mean
duration of dinosaur genera (7.7 Ma), the presence of so many dinosaur
species in the Latest Cretaceous is consistent with the termination of
most lineages at the Cretaceous-Tertiary boundary (the Late
Maastrichtian sub-stage is 2.8 m.y. long). The Late Maastrichtian
dinosaurian biodiversity is therefore consistent with the sudden
extinction of the group following the Chicxulub impact.


Guntupalli V.R. Prasad (2012)
Vertebrate biodiversity of the Deccan volcanic province of India: A review.
Bulletin de la Société Géologique de France 183(6):. 597-610
doi: 10.2113/gssgfbull.183.6.597

The Deccan Traps of peninsular India, representing one of the largest
flood basalt eruptions on the earth's surface, have been a subject of
intensive research in the last three decades because of the attributed
link between the Deccan Traps and the Cretaceous-Tertiary boundary
mass extinctions. In this context, the biota from the sedimentary beds
intercalated with the volcanic flows and underlying the oldest
volcanic flow are more important for understanding the faunal
diversity and palaeobiogeography of India during the time span of
volcanic eruptions. A detailed review of the vertebrate faunal
diversity of the Deccan volcanic province is presented here.