Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada

Mallon, Jordan C.; Evans, David C.; Ryan, Michael J.; Anderson, J. G. C.

doi:10.1016/j.palaeo.2012.06.024

Cited by 90 publications

(140 citation statements)

References 61 publications

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“…Nevertheless, several things are apparent. For one, virtually all the ankylosaurid specimens are from the lower 40 m of the formation, with none from the top 20-25 m, as noted by Mallon et al (2012). Based on AMNH field notes, most of those for which accurate elevation data is lacking appear to be from low in the formation.…”

Section: Discussionmentioning

confidence: 99%

A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA

Penkalski

2013

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Section: Discussionmentioning

confidence: 99%

A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA

Penkalski

2013

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“…Prior to this discovery, Maastrichtian-aged ceratopsid and hadrosaurid taxa exhibited a pattern of lower diversity and longer duration than Campanian-aged taxa [12,40,41] and may also have exhibited a pattern of lower morphological disparity [42] and slowing of evolutionary rates. Regaliceratops not only increases the diversity of Maastrichtian ceratopsids but also greatly increases the known morphological disparity.…”

Section: Chasmosaurine Evolutionmentioning

confidence: 99%

A New Horned Dinosaur Reveals Convergent Evolution in Cranial Ornamentation in Ceratopsidae

Brown

Henderson

2015

Current Biology

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Ceratopsid (horned) dinosaurs are an iconic group of large-bodied, quadrupedal, herbivorous dinosaurs that evolved in the Late Cretaceous and were largely restricted to western North America [1-5]. Ceratopsids are easily recognized by their cranial ornamentation in the form of nasal and postorbital horns and frill (capped by epiossifications); these structures show high morphological disparity and also represent the largest cranial display structures known to have evolved [2, 4]. Despite their restricted occurrence in time and space, this group has one of the best fossil records within Dinosauria, showing a rapid diversification in horn and frill morphology [1]. Here a new genus and species of chasmosaurine ceratopsid is described based on a nearly complete and three-dimensionally preserved cranium recovered from the uppermost St. Mary River Formation (Maastrichtian) of southwestern Alberta. Regaliceratops peterhewsi gen. et sp. nov. exhibits many unique characters of the frill and is characterized by a large nasal horncore, small postorbital horncores, and massive parietal epiossifications. Cranial morphology, particularly the epiossifications, suggests close affinity with the late Campanian/early Maastrichian taxon Anchiceratops, as well as with the late Maastrichtian taxon Triceratops. A median epiparietal necessitates a reassessment of epiossification homology and results in a more resolved phylogeny. Most surprisingly, Regaliceratops exhibits a suite of cranial ornamentations that are superficially similar to Campanian centrosaurines, indicating both exploration of novel display morphospace in Chasmosaurinae, especially Maastrichtian forms, and convergent evolution in horn morphology with the recently extinct Centrosaurinae. This marks the first time that evolutionary convergence in horn-like display structures has been demonstrated between dinosaur clades, similar to those seen in fossil and extant mammals [6].

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“…Several researchers (Fiorillo 2008;Fiorillo et al 2009;Larson and Currie 2013;Zanno et al 2011) have noted the unusually wide geographic and stratigraphic distribution of small coelurosaurian theropod species in the Western Interior Basin, and that these ranges are largely defined by the assignment of isolated teeth to form taxa. In other groups, such as large ornithischians, differentiation of species relies on non-dentigerous skeletal elements, and these taxa have small geographic and stratigraphic ranges, and presumably exhibited high evolutionary rates and ecological specialization (Eberth et al 2013;Gates et al 2012;Mallon et al 2012;Ryan and Evans 2005;Sampson and Loewen 2010). Zanno et al (2011) recognized variation in the limited skeletal materials previously referred to Troodon, and hypothesized that the diversity of Late Cretaceous troodontids in North America is underestimated, a conclusion that was supported by a morphometric analysis of small theropod teeth by Larson and Currie (2013).…”

Section: Discussionmentioning

confidence: 99%

A new species of troodontid theropod (Dinosauria: Maniraptora) from the Horseshoe Canyon Formation (Maastrichtian) of Alberta, Canada

et al. 2017

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Troodontid material from the Maastrichtian of North America is extremely rare, beyond isolated teeth from microvertebrate sites. Here we describe troodontid frontals from the early Maastrichtian Horseshoe Canyon Formation (Horsethief Member). The most complete specimen, TMP 1993.105.01, is notably foreshortened and robust when compared to numerous specimens referred to Troodon from the Dinosaur Park Formation, and exhibits several characteristics that distinguish it from other Late Cretaceous troodontids. Morphometric analyses reinforce shape differences between TMP 1993.105.01 and other North America troodontids, and show that proportional differences are independent of size. We therefore erect a new taxon, Albertavenator curriei gen. et. sp. nov., that is diagnosed by the following autapomorphies: 1) primary supraciliary foramen is truncated anteriorly by the lacrimal contact, 2) superficial (ectocranial) surface of the frontal proportionally shorter than all known troodontids, with a length to width ratio under 1.25, and 3) frontoparietal contact in which an enlarged lappet of the frontal extends medially to extensively overlap the lateral region of the anteromedial process of the parietal.

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Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada

Cited by 90 publications

References 61 publications

A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA

A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA

A New Horned Dinosaur Reveals Convergent Evolution in Cranial Ornamentation in Ceratopsidae

A new species of troodontid theropod (Dinosauria: Maniraptora) from the Horseshoe Canyon Formation (Maastrichtian) of Alberta, Canada

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