Barsboldia

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Barsboldia
Temporal range: Late Cretaceous, 70Ma
Barsboldia.jpg
Sacrum of the holotype
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Ornithischia
Family: Hadrosauridae
Subfamily: Saurolophinae
Genus: Barsboldia
Maryańska & Osmólska, 1981
Species
  • B. sicinskii Maryańska & Osmólska, 1981 (type)

Barsboldia (meaning "of Barsbold", a well-known Mongolian paleontologist) was a genus of large hadrosaurid dinosaur from the early Maastrichtian Nemegt Formation of Ömnogöv', Mongolia. It is known from a partial vertebral column, partial pelvis, and some ribs.

Description[edit]

Restoration

Teresa Maryańska and Halszka Osmólska based this genus on ZPAL MgD-1/110, a partial skeleton consisting of nine back vertebrae, nine hip vertebrae, fifteen tail vertebrae, a left ilium, parts of the left and right pubis, several ribs, and a few fragments of the hind limbs, with the backbone largely articulated. The most distinctive features of this skeleton are found in the neural spines. These are very tall, particularly over the hips, and were described as second only to those of Hypacrosaurus altispinus and the tips of those found in the first few vertebrae of the tail are club-shaped[1] (possibly a sign of old age).[2]

Phylogeny[edit]

Maryańska and Osmólska described their new genus as a lambeosaurine (or hollow-crested duckbill), the first from the Nemegt Formation, although it lacked a skull. However, the sacrum has a keel along the bottom, a possible lambeosaurine feature,[3] and the bones closely resemble those of Hypacrosaurus.[2][4] With only one partial skeleton known, and no skull, the genus has been considered dubious[3] or a possible lambeosaurine of uncertain placement.[5] A newer study published in 2011 suggests that Barsboldia is actually a valid saurolophine.[6]

The following cladogram was recovered in the 2011 phylogenetic analysis of Hadrosauroidea by Prieto-Márquez (the relationships within Lambeosaurinae and between basal hadrosauroids aren't shown).[6]

Caudal vertebrae
Vertebrae


Telmatosaurus




Lophorhothon


 Hadrosauridae 

Hadrosaurus


 Saurolophidae 

Lambeosaurinae


 Saurolophinae 


Maiasaura



Brachylophosaurus





Barsboldia




Shantungosaurus





Edmontosaurus annectens



Edmontosaurus regalis






Unnamed Sabinas species




Kerberosaurus




Prosaurolophus




Saurolophus osborni



Saurolophus angustirostris








Wulagasaurus




Kritosaurus





Gryposaurus latidens




Gryposaurus notabilis



Gryposaurus monumentensis






Unnamed Big Bend species




Secernosaurus



Willinakaqe (=Salitral Moreno species)
















Paleobiology[edit]

As a hadrosaurid, Barsboldia would have been a bipedal/quadrupedal herbivore, eating plants with a sophisticated skull that permitted a grinding motion analogous to chewing, and was furnished with hundreds of continually-replaced teeth. If it was a lambeosaurine, it would have had a hollow crest formed out of expanded skull bones containing the nasal passages, with a function relating to identification by sight and sound.[5]

References[edit]

  1. ^ Maryańska, Teresa; Osmólska, Halszka (1981). "First lambeosaurine dinosaur from the Nemegt Formation, Upper Cretaceous, Mongolia". Acta Palaeontologica Polonica 26: 243–255. 
  2. ^ a b Brett-Surman, Michael K. (1989). A revision of the Hadrosauridae (Reptilia:Ornithischia) and their evolution during the Campanian and Maastrichtian. Ph.D. dissertation. Washington, D.C.: Graduate School of Arts and Sciences of The George Washington University. pp. 1–272. 
  3. ^ a b Norman, David B.; Sues, Hans-Dieter (2000). "Ornithopods from Kazakhstan, Mongolia and Siberia". In Benton, Michael J.; Shishkin, Mikhail A.; Unwin, David M.; and Kurochkin, Evgenii N. The Age of Dinosaurs in Russia and Mongolia. Cambridge: Cambridge University Press. pp. 462–479. ISBN 0-521-55476-4. 
  4. ^ Glut, Donald F. (1997). "Barsboldia". Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. p. 202. ISBN 0-89950-917-7. 
  5. ^ a b Horner, John R.; Weishampel, David B.; Forster, Catherine A (2004). "Hadrosauridae". In Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.). The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 438–463. ISBN 0-520-24209-2. 
  6. ^ a b Prieto-Márquez, Albert (2011). "A Reappraisal of Barsboldia sicinskii (Dinosauria: Hadrosauridae) from the Late Cretaceous of Mongolia". Journal of Paleontology 83 (3): 468–477. doi:10.1666/10-106.1.