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The late-surviving ‘duck-billed’ dinosaur Augustynolophus from the upper Maastrichtian of western North America and crest evolution in Saurolophini

  • ALBERT PRIETO-MÁRQUEZ (a1) (a2), JONATHAN R. WAGNER (a3), PHIL R. BELL (a4) and LUIS M. CHIAPPE (a1)
Abstract
Abstract

We amend the taxonomy and provide new anatomical information on the hadrosaurid dinosaur Saurolophus morrisi (upper Maastrichtian Moreno Formation, central California, USA) derived from full preparation of the referred skull roof. The cranial morphology of this species is distinct enough to justify the new combination Augustynolophus morrisi gen. nov. The morphology of the nasals and surrounding cranial bones indicates that A. morrisi sported a solid nasal crest ending in an elongate triangular plate that extended above the skull roof. Autapomorphies include a crescentic base of the frontal caudodorsal process and extension of the process caudal to the frontal ‘dome’; distal end of nasal crest with knob-like process inflected rostrally; circumnarial depression lightly incised and weakly emarginated, adjacent to caudolateral margin of nasal and occupying two-thirds the width of lateral surface of distal region of crest; and caudal surface of distal nasal crest subrectangular. We formally establish the new tribe Saurolophini consisting of Prosaurolophus, Augustynolophus and Saurolophus. Saurolophin synapomorphies include a premaxilla with broad arcuate contour of rostrolateral region of thin everted oral margin and flat and steeply inclined occlusal surface of dentary dental battery, among other characters. Saurolophin crests evolved towards increasing caudodorsal length, along with caudal extension of the circumnarial fossa and involvement into the crest of adjacent facial elements. Augustynolophus is the second described genus of North American late Maastrichtian hadrosaurids. Its recognition implies a greater diversity among late Maastrichtian dinosaur faunas than previously recognized and is congruent with hypotheses of endemism and/or provinciality during Late Cretaceous time.

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Author for correspondence: a.prietomarquez@bristol.uk.ac
References
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Archibald J. D. 1996. Dinosaur Extinction and the End of an Era. New York: Columbia University Press, 235 pp.
Bakker R. T. 1986. The Dinosaur Heresies: New Theories Unlocking the Mystery of the Dinosaurs and Their Extinction. New York: Kensington Publishing, 481 pp.
Bell P. R. 2010. Redescription of the skull of Saurolophus osborni Brown, 1912 (Ornithischia: Hadrosauridae). Cretaceous Research 32, 3044.
Bell P. R. 2011. Cranial osteology and ontogeny of Saurolophus angustirostris from the Late Cretaceous of Mongolia with comments on Saurolophus osborni from Canada. Acta Palaeontologica Polonica 56, 703–22.
Bell P. R. & Evans D. C. 2010. Revision of the status of Saurolophus (Hadrosauridae) from California, U.S.A. Canadian Journal of Earth Sciences 47, 1417–26.
Brown B. B. 1910. The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus Kritosaurus . Bulletin of the American Museum of Natural History 28, 267–74.
Brown B. 1912. A crested dinosaur from the Edmonton Cretaceous. Bulletin of the American Museum of Natural History 31, 131–6.
Brown B. 1913. The skeleton of Saurolophus, a crested duck-billed dinosaur from the Edmonton Cretaceous. Bulletin of the American Museum of Natural History 32, 387–93.
Brown B. 1914. Corythosaurus casuarius, a new crested dinosaur from the Belly River Cretaceous, with provisional classification of the family Trachodontidae. Bulletin of the American Museum of Natural History 32, 395406.
Brown B. 1916. A new crested trachodont dinosaur Prosaurolophus maximus . Bulletin of the American Museum of Natural History 35, 701–8.
Brown C. M., Boyd C. A. & Russell A. P. 2011. A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America. Zoological Journal of the Linnean Society 163, 1157–98.
Brusatte S. L., Butler R. J., Prieto-Márquez A. & Norell M. A. 2012. Dinosaur morphological diversity and the end-Cretaceous extinction. Nature Communications 3, 804. doi: 10.1038/NCOMMS1815.
Campione N. E. & Evans D. C. 2011. Cranial growth and variation in edmontosaurs (Dinosauria: Hadrosauridae): implications for latest Cretaceous megaherbivore diversity in North America. PLoS ONE 6 (9), e25186. doi: 10.1371/journal.pone.0025186.
Cope E. D. 1870. Synopsis of extinct Batrachia, Reptilia and Aves of North America. Transactions of the American Philosophical Society 14, 1252.
Dollo L. 1888. Iguanodontidae et Camptonotidae. Comptes Rendus hebdomadaires de l’Academie des Sciences, Paris 106, 775–7.
Eberth D. A., Evans D. C., Brinkman D. B., Therrien F., Tanke D. H. & Russell L. S. 2013. Dinosaur biostratigraphy of the Edmonton Group (Upper Cretaceous), Alberta, Canada: evidence for climate influence. Canadian Journal of Earth Sciences 50, 701–26.
Evans D. C. 2010. Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia). Zoological Journal of the Linnean Society 159, 396434.
Farke A. A. 2011. Anatomy and taxonomic status of the chasmosaurine ceratopsid Nedoceratops hatcheri from the Upper Cretaceous Lance Formation of Wyoming, U.S.A. PLoS ONE 6 (1), e16196. doi: 10.1371/journal.pone.0016196.
Ford K. W. 2006. Stratigraphic positions of marine reptile and dinosaur specimens in the Moreno Formation, in the Tumey Hills and Panoche Hills, Fresno County, California. New Mexico Museum of Natural History and Science Bulletin 35, 407–10.
Gates T. A. & Farke A. A. 2009. Biostratigraphic and biogeographic implications of a hadrosaurid (Ornithopoda: Dinosauria) from the Upper Cretaceous Almond Formation of Wyoming, U.S.A. Cretaceous Research 30, 1157–63.
Gates T. A., Horner J. R., Hanna R. R. & Nelson C. R. 2011. New unadorned hadrosaurine hadrosaurid (Dinosauria, Ornithopoda) from the Campanian of North America. Journal of Vertebrate Paleontology 31, 798811.
Gates T. A. & Sampson S. D. 2007. A new species of Gryposaurus (Dinosauria: Hadrosauridae) from the late Campanian Kaiparowits Formation, southern Utah, U.S.A. Zoological Journal of the Linnean Society 151, 351–76.
Godefroit P., Bolotsky Y. L. & Lauters P. 2012. A new saurolophine dinosaur from the latest Cretaceous of Far Eastern Russia. PLoS ONE 7 (5), e36849. doi: 10.1371/journal.pone.0036849.
Godefroit P., Hai S., Yu T. & Lauters P. 2008. New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China. Acta Palaeontologica Polonica 53, 4774.
Goloboff P. A., Farris J. S. & Nixon K. 2008. TNT, a free program for phylogenetic analysis. Cladistics 24, 774–86.
Hopson J. A. 1975. The evolution of cranial display structures in hadrosaurian dinosaurs. Paleobiology 1, 2143.
Hu C., Zhengwu C., Qiqing P. & Xiafosi F. 2001. Shantungosaurus giganteus. Hauyu Nature Trade, 135 pp.
Hunt A. P. & Lucas S. G. 1991. An associated Maastrichtian hadrosaur and Turonian ammonite from the Naashoibito Member, Kirtland Formation (Late Cretaceous: Maastrichtian), northwestern New Mexico. New Mexico Journal of Science 31, 2735.
International Commission of Zoological Nomenclature. 1999. International Code of Zoological Nomenclature, Fourth Edition. The International Trust for Zoological Nomenclature, 305 pp.
Kirkland J. I. 1998. A new hadrosaurid from the Upper Cedar Mountain Formation (Albian-Cenomanian: Cretaceous) of eastern Utah: the oldest known hadrosaurid (Lambeosaurinae?). New Mexico Museum of Natural History and Science Bulletin 14, 283–95.
Lambe L. M. 1917. A new genus and species of crestless hadrosaur from the Edmonton Formation of Alberta. The Ottawa Naturalist 31, 6573.
Lehman T. M. 1987. Late Maastrichtian paleoenvironments and dinosaur biogeography in the western interior of North America. Palaeogeography, Palaeoclimatology, Palaeoecology 60, 189217.
Lehman T. M. 2001. Late Cretaceous Dinosaur Provinciality. In Mesozoic Vertebrate Life (eds Tanke D. H. and Carpenter K.), pp. 310–28. Indianapolis: Indiana University Press.
Marsh O. C. 1881. Principal characters of the American Jurassic dinosaurs, part IV. American Journal of Science 21, 417–23.
McGarrity C. T., Campione N. E. & Evans D. C. 2013. Cranial anatomy and variation in Prosaurolophus maximus (Dinosauria: Hadrosauridae). Zoological Journal of the Linnean Society 167, 531–68.
Morris W. J. 1973. A review of Pacific coast Hadrosaurs. Journal of Paleontology 47, 551–61.
Owen R. 1842. Report on British fossil reptiles. Part II. Report of Eleventh Meeting of the British Association of the Advancement of Science, Plymouth, July 1841, 60204.
Parks W. A. 1923. Corythosaurus intermedius, a new species of trachodont dinosaur. University of Toronto Studies, Geological Series 15, 557.
Parks W. A. 1924. Dyoplosaurus acutosquameus, a new genus and species of armoured dinosaur; and notes on a skeleton of Prosaurolophus maximus . University of Toronto Studies, Geological Series 25, 535.
Prieto-Márquez A. 2005. New information on the cranium of Brachylophosaurus canadensis (Dinosauria, Hadrosauridae), with a revision of its phylogenetic position. Journal of Vertebrate Paleontology 25, 144–56.
Prieto-Márquez A. 2010. Global phylogeny of Hadrosauridae (Dinosauria: Ornithopoda) using parsimony and Bayesian methods. Zoological Journal of the Linnean Society 159, 435502.
Prieto-Márquez A. 2012. The skull and appendicular skeleton of Gryposaurus latidens, a saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the early Campanian (Cretaceous) of Montana, U.S.A. Canadian Journal of Earth Sciences 49, 519–32.
Prieto-Márquez A. 2014. Skeletal morphology of Kritosaurus navajovius (Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini. Journal of Systematic Palaeontology 12, 133–75. doi: 10.1080/1472019.2013.770417.
Prieto-Márquez A. & Wagner J. R. 2013 a. A new species of saurolophine hadrosaurid from the Late Cretaceous of the Pacific coast of North America. Acta Palaeontologica Polonica 58, 255–68.
Prieto-Márquez A. & Wagner J. R. 2013 b. The ‘unicorn’ dinosaur that wasn’t: a new reconstruction of the crest of Tsintaosaurus and the early evolution of the lambeosaurine crest and rostrum. PLoS ONE 8 (11), e82268. doi: 10.1371/journal.pone.0082268.
Rozhdestvensky A. K. 1957. The duck-billed dinosaur Saurolophus from the Upper Cretaceous of Mongolia. Vertebrata PalAsiatica, 1, 129–49 (in Russian).
Seeley H. G. 1887. On the classification of the fossil animals commonly called Dinosauria. Proceedings of the Royal Society of London 43, 165–71.
Sternberg C. M. 1953. A new hadrosaur from the Oldman Formation of Alberta: discussion of nomenclature. National Museum of Canada, Bulletin 128, 275–86.
Swofford D. L. 2002. PAUP*. Phylogenetic Analysis Using Parsimony (*and Other Methods). Version 4.0b10. Sunderland: Sinauer Associates.
Wagner J. R. 2004. Hard-tissue homologies and their consequences for interpretation of the cranial crests of lambeosaurine dinosaurs (Dinosauria: Hadrosauria). Journal of Vertebrate Paleontology 24 (Supplement to 3), 125A–6A.
Walker J. D, Geissman J. W., Bowring S. A. & Babcock L. E. 2012. Geologic Time Scale v. 4.0. Geological Society of America. doi: 10.1130/2012.CTS004R3C.
Weishampel D. B. & Horner J. R. 1990. Hadrosauridae. In The Dinosauria (eds Weishampel D. B., Dodson P. & Osmólska H.), pp. 534–61. Berkeley: University of California Press.
Weishampel D. B., Norman D. B. & Grigorescu D. 1993. Telmatosaurus transsylvanicus from the Late Cretaceous of Romania: the most basal hadrosaurid dinosaur. Palaeontology 36, 361–85.
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