[dinosaur] Nemegtonykus, new alvarezsaurid from Nemegt Formation of Mongolia (free pdf)

Ben Creisler
[email protected]


A new paper in open access with free pdf:


Nemegtonykus citus gen. et sp. nov.

Sungjin Lee, Jin-Young Park, Yuong-Nam Lee, Su-Hwan Kim, Junchang Lü,
Rinchen Barsbold & Khishigjav Tsogtbaatar (2019)
A new alvarezsaurid dinosaur from the Nemegt Formation of Mongolia.
Scientific Reports 9, Article number: 15493
doi:  https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1038_s41598-2D019-2D52021-2Dy&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=NdjvZuG_Tqwtoh66p29oLjZJ2G6cfKDx9pPBpiXb4XI&s=v3tei92CmQVtXbG0GxI2JBNN1JN0yWvovsf1CCdxOrY&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.nature.com_articles_s41598-2D019-2D52021-2Dy&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=NdjvZuG_Tqwtoh66p29oLjZJ2G6cfKDx9pPBpiXb4XI&s=h40p60TzTtPMp7UQgeue1emJz4Hol7N47Gwm0kArJ8E&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.nature.com_articles_s41598-2D019-2D52021-2Dy.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=NdjvZuG_Tqwtoh66p29oLjZJ2G6cfKDx9pPBpiXb4XI&s=SVub6Z3idEAxwTsUWxfYqMf9LESjNnhh1uFVMrh5dkc&e= 


Alvarezsaurid diversity has been markedly increased by recent discoveries
from China. However, the number of alvarezsaurid specimens in the Nemegt
Formation of Mongolia remained low since the initial report on Mononykus
olecranus in 1993. Here we report three new alvarezsaurid specimens from
this formation, which were associated with each other and also with
multiple oviraptorid skeletons in a small multi-species assemblage. Two of
the alvarezsaurid specimens represent a new taxon, Nemegtonykus citus gen.
et sp. nov., which is mainly distinguished from other alvarezsaurids by the
first sacral vertebra with a subtrapezoidal lamina, the second sacral
centrum which is directly co-ossified with ilium, the posterodorsally
oriented postacetabular process of ilium, and partial co-ossification
between metatarsals II and IV. The other specimen is very similar to M.
olecranus in morphology and referred to cf. Mononykus sp. Our phylogenetic
analysis recovered Nemegtonykus as a parvicursorine forming a polytomy with
several other taxa from the Gobi Desert. The presence of three
alvarezsaurid individuals in the same locality indicates that the abundance
of alvarezsaurids have been greatly underestimated in the Nemegt dinosaur
faunas.

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