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GEOREF RECORD

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

Albert Prieto Marquez, Jonathan R. Wagner, Phil R. Bell and Luis M. Chiappe
The late-surviving "duck-billed" dinosaur Augustynolophus from the upper Maastrichtian of western North America and crest evolution in Saurolophini
Geological Magazine (March 2015) 152 (2): 225-241

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.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 152
Serial Issue: 2
Title: The late-surviving "duck-billed" dinosaur Augustynolophus from the upper Maastrichtian of western North America and crest evolution in Saurolophini
Affiliation: Natural History Museum of Los Angeles County, Dinosaur Institute, Los Angeles, CA, United States
Pages: 225-241
Published: 201503
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 47
Accession Number: 2015-049795
Categories: Vertebrate paleontologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Texas State University-San Marcos, USA, United StatesUniversity of New England, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201523
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