Journal
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
Volume 159, Issue 2, Pages 373-397Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1096-3642.2009.00612.x
Keywords
dinosaur; hadrosaur; Hadrosaurinae; morphological variation
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Funding
- CRO/NSERC
- NSERC
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The holotype of Brachylophosaurus canadensis was collected by C. M. Sternberg in 1936 from the Oldman Formation (Upper Cretaceous) of Alberta, Canada, with a brief description focusing on the cranium following in 1953. A re-description of the holotype skeleton confirms its position as a hadrosaurine dinosaur exhibiting the following unique combination of characters: paddle-like solid nasal crest; posteriorly elongated prefrontal; only the anterior tip of the lacrimal contacting maxilla; extremely elongated anterior maxillary process; and a quadratojugal with a noncrescentic posterior margin variably forming a paraquadratic foramen with the quadrate. Comparison of the holotype with other specimens assigned to the taxon reveals numerous morphological differences. These variable features include the presence/absence of an accessory premaxillary foramen, the number of maxillary/dentary vertical tooth rows, the number of functional teeth per tooth row contributing to the dental occlusal surface, the bones forming the mandibular glenoid, the presence/absence of a nasal foramen, nasal crest morphology, the number of cervical vertebrae, and axis morphology. (C) 2010 The Linnean Society of London, Zoological Journal of the Linnean Society, 2010, 159, 373-397.doi: 10.1111/j.1096-3642.2009.00612.x
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