New specimens of Nemegtomaia from the Baruungoyot and Nemegt Formations (Late Cretaceous) of Mongolia.

PloS One
Federico FantiDemchig Badamgarav

Abstract

Two new specimens of the oviraptorid theropod Nemegtomaia barsboldi from the Nemegt Basin of southern Mongolia are described. Specimen MPC-D 107/15 was collected from the upper beds of the Baruungoyot Formation (Campanian-Maastrichtian), and is a nest of eggs with the skeleton of the assumed parent of Nemegtomaia on top in brooding position. Much of the skeleton was damaged by colonies of dermestid coleopterans prior to its complete burial. However, diagnostic characters are recovered from the parts preserved, including the skull, partial forelimbs (including the left hand), legs, and distal portions of both feet. Nemegtomaia represents the fourth known genus of oviraptorid for which individuals have been found on nests of eggs. The second new specimen, MPC-D 107/16, was collected a few kilometers to the east in basal deposits of the Nemegt Formation, and includes both hands and femora of a smaller Nemegtomaia individual. The two formations and their diverse fossil assemblages have been considered to represent sequential time periods and different environments, but data presented here indicate partial overlap across the Baruungoyot-Nemegt transition. All other known oviraptorids from Mongolia and China are known exclusively fro...Continue Reading

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Citations

Dec 17, 2014·Science·Xing XuDavid J Varricchio
Nov 26, 2015·PloS One·Kohei TanakaFrançois Therrien
Jul 14, 2018·PeerJ·Tzu-Ruei YangP Martin Sander
Jul 30, 2020·Ecology and Evolution·Albert Prieto-MárquezPeter J Makovicky
May 18, 2018·Biology Letters·Kohei TanakaRongjun Chen
Aug 22, 2018·Scientific Reports·David J VarricchioJason Hogan
Nov 19, 2020·Royal Society Open Science·Gregory F FunstonPhilip J Currie
Nov 22, 2019·Integrative Organismal Biology·T-R YangB Schillinger

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Methods Mentioned

BETA
scanning electron microscopy
thermal stress

Software Mentioned

MPC
PAUP
Conchoraptor

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