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Perinatal specimens of Saurolophus angustirostris (Dinosauria: Hadrosauridae), from the Upper Cretaceous of Mongolia

Leonard Dewaele UGent, Khishigjav Tsogtbaatar, Rinchen Barsbold, Géraldine Garcia, Koen Stein, François Escuillié and Pascal Godefroit (2015) PLOS ONE. 10(10).
abstract
Background: The Late Cretaceous Nemegt Formation, Gobi Desert, Mongolia has already yielded abundant and complete skeletons of the hadrosaur Saurolophus angustirostris, from half-grown to adult individuals. Methodology/Principal Findings: Herein we describe perinatal specimens of Saurolophus angustirostris, associated with fragmentary eggshell fragments. The skull length of these babies is around 5% that of the largest known S. angustirostris specimens, so these specimens document the earliest development stages of this giant hadrosaur and bridge a large hiatus in our knowledge of the ontogeny of S. angustirostris. Conclusions/Significance: The studied specimens are likely part of a nest originally located on a riverbank point bar. The perinatal specimens were buried by sediment carried by the river current presumably during the wet summer season. Perinatal bones already displayed diagnostic characters for Saurolophus angustirostris, including premaxillae with a strongly reflected oral margin and upturned premaxillary body in lateral aspect. The absence of a supracranial crest and unfused halves of the cervical neural arches characterize the earliest stages in the ontogeny of S. angustirostris. The eggshell fragments associated with the perinatal individuals can be referred to the Spheroolithus oogenus and closely resemble those found in older formations (e.g. Barun Goyot Fm in Mongolia) or associated with more basal hadrosauroids (Bactrosaurus-Gilmoreosaurus in the Iren Dabasu Fm, Inner Mongolia, China). Thisobservation suggests that the egg microstructure was similar in basal hadrosauroids and more advanced saurolophines.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Saurolophus angustirostris, Dinosauria, Hadrosauridae, Mongolia, Upper Cretaceous, Nemegt Formation, Ontogeny, WESTERN NORTH-AMERICA, ORNITHISCHIA, EGGSHELLS, REMAINS, EMBRYOS, GROWTH, CHINA
journal title
PLOS ONE
PLoS One
volume
10
issue
10
article number
e0138806
pages
33 pages
Web of Science type
Article
Web of Science id
000363183100025
JCR category
MULTIDISCIPLINARY SCIENCES
JCR impact factor
3.057 (2015)
JCR rank
11/63 (2015)
JCR quartile
1 (2015)
ISSN
1932-6203
DOI
10.1371/journal.pone.0138806
language
English
UGent publication?
yes
classification
A1
copyright statement
I have retained and own the full copyright for this publication
id
6963696
handle
http://hdl.handle.net/1854/LU-6963696
date created
2015-10-19 20:53:20
date last changed
2017-03-31 11:42:01
@article{6963696,
  abstract     = {Background: The Late Cretaceous Nemegt Formation, Gobi Desert, Mongolia has already yielded abundant and complete skeletons of the hadrosaur Saurolophus angustirostris, from half-grown to adult individuals.
Methodology/Principal Findings: Herein we describe perinatal specimens of Saurolophus angustirostris, associated with fragmentary eggshell fragments. The skull length of these babies is around 5\% that of the largest known S. angustirostris specimens, so these specimens document the earliest development stages of this giant hadrosaur and bridge a large hiatus in our knowledge of the ontogeny of S. angustirostris.
Conclusions/Significance: The studied specimens are likely part of a nest originally located on a riverbank point bar. The perinatal specimens were buried by sediment carried by the river current presumably during the wet summer season. Perinatal bones already displayed diagnostic characters for Saurolophus angustirostris, including premaxillae with a strongly reflected oral margin and upturned premaxillary body in lateral aspect. The absence of a supracranial crest and unfused halves of the cervical neural arches characterize the earliest stages in the ontogeny of S. angustirostris. The eggshell fragments associated with the perinatal individuals can be referred to the Spheroolithus oogenus and closely resemble those found in older formations (e.g. Barun Goyot Fm in Mongolia) or associated with more basal hadrosauroids (Bactrosaurus-Gilmoreosaurus in the Iren Dabasu Fm, Inner Mongolia, China). Thisobservation suggests that the egg microstructure was similar in basal hadrosauroids and more advanced saurolophines.},
  articleno    = {e0138806},
  author       = {Dewaele, Leonard and Tsogtbaatar, Khishigjav and Barsbold, Rinchen and Garcia, G{\'e}raldine and Stein, Koen and Escuilli{\'e}, Fran\c{c}ois and Godefroit, Pascal},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  keyword      = {Saurolophus angustirostris,Dinosauria,Hadrosauridae,Mongolia,Upper Cretaceous,Nemegt Formation,Ontogeny,WESTERN NORTH-AMERICA,ORNITHISCHIA,EGGSHELLS,REMAINS,EMBRYOS,GROWTH,CHINA},
  language     = {eng},
  number       = {10},
  pages        = {33},
  title        = {Perinatal specimens of Saurolophus angustirostris (Dinosauria: Hadrosauridae), from the Upper Cretaceous of Mongolia},
  url          = {http://dx.doi.org/10.1371/journal.pone.0138806},
  volume       = {10},
  year         = {2015},
}

Chicago
Dewaele, Leonard, Khishigjav Tsogtbaatar, Rinchen Barsbold, Géraldine Garcia, Koen Stein, François Escuillié, and Pascal Godefroit. 2015. “Perinatal Specimens of Saurolophus Angustirostris (Dinosauria: Hadrosauridae), from the Upper Cretaceous of Mongolia.” Plos One 10 (10).
APA
Dewaele, L., Tsogtbaatar, K., Barsbold, R., Garcia, G., Stein, K., Escuillié, F., & Godefroit, P. (2015). Perinatal specimens of Saurolophus angustirostris (Dinosauria: Hadrosauridae), from the Upper Cretaceous of Mongolia. PLOS ONE, 10(10).
Vancouver
1.
Dewaele L, Tsogtbaatar K, Barsbold R, Garcia G, Stein K, Escuillié F, et al. Perinatal specimens of Saurolophus angustirostris (Dinosauria: Hadrosauridae), from the Upper Cretaceous of Mongolia. PLOS ONE. 2015;10(10).
MLA
Dewaele, Leonard, Khishigjav Tsogtbaatar, Rinchen Barsbold, et al. “Perinatal Specimens of Saurolophus Angustirostris (Dinosauria: Hadrosauridae), from the Upper Cretaceous of Mongolia.” PLOS ONE 10.10 (2015): n. pag. Print.