Osteology of a new late Cretaceous troodontid specimen from Ukhaa Tolgod, Om̈nog̈ovi Aimag, Mongolia

Title Variants

Alternative: New troodontid specimen from Ukhaa Tolgod

Related Titles

Series: American Museum novitates, number 3889

By

Pei, Rui , author

Barta, Daniel E. , author
Bever, Gabe S. , author
Norell, Mark A. , author
Pittman, Michael, 1985- , author
Xu, Xing, 1969- , author

Type

Book

Material

Published material

Publication info

New York, NY American Museum of Natural History [2017]

Notes

Caption title.

"December 15, 2017."

A new troodontid dinosaur, Almas ukhaa, from the Late Cretaceous deposits of the Djadokhta Formation at Ukhaa Tolgod, Mongolia, is described here. The holotype specimen (IGM 100/1323) comprises an almost complete and articulated cranium and partial articulated postcranial skeleton. This specimen has a small body size and a short snout as in basal paravians, but it exhibits a number of derived troodontid features that differentiate Almas ukhaa from the Early Cretaceous troodontids reported from China and unite this new taxon with other Late Cretaceous troodontids. Relative to other troodontids, Almas ukhaa is autapomorphic in the presence of a posteriorly curved pterygoid flange, absence of a lateral groove on the anterior part of the dentary, presence of a distinct spikelike process on the ischium, and elongate chevrons. The eggshell associated with IGM 100/1323 can be assigned to Prismatoolithidae indet. based on the smooth surface, eggshell thickness, and microstructural characteristics, and also preserves attributes similar to Protoceratopsidovum minimum. A unique relationship between Byronosaurus and the perinate troodontids IGM 100/972 and IGM 100/974 is no longer supported based on the new observations of Almas ukhaa and Gobivenator.

Subjects

Almas ukhaa , Cretaceous , Dinosaurs , Mongolia , Omnogov Aimag , Paleontology , Reptiles, Fossil , Skull , Troodontidae , Ukhaa Tolgod

Call Number

QL1 .A436 no.3889 2017

Language

English

Identifiers

DOI: https://doi.org/10.1206/3889.1
OCLC: 1015374841