Thescelosaur Thescelosaurus Assiniboiensis Name Means: ‘Wondrous Lizard’ from ‘The District of Assiniboia’

Total Page:16

File Type:pdf, Size:1020Kb

Thescelosaur Thescelosaurus Assiniboiensis Name Means: ‘Wondrous Lizard’ from ‘The District of Assiniboia’ Thescelosaur Thescelosaurus assiniboiensis Name means: ‘Wondrous Lizard’ from ‘the District of Assiniboia’. Notable specimen from Saskatchewan: Type Specimen. (A type specimen is the one specimen that is used as reference for the description of a new species) Size: At about 3 m long and just over 1 m tall, Thescelosaurus assiniboiensis is one of the smallest thescelosaur species. It is one of the more common dinosaurs from Saskatchewan, but this species is unique to this province. Geologic Timeline Thescelosaurus assiniboiensis Period Epoch Holocene lived between 65-67 million Pleistocene years ago. In Saskatchewan, Pliocene Age they have been found in the geological unit called the 3 m Frenchman Formation. (23 million years ago - Present) ago years (23 million Geographic range: Miocene The genus Thescelosaurus includes at least three species, and is found from Saskatchewan to New Mexico Habitat: NEOGENE In Saskatchewan: The genus Thescelosaurus is known from southwestern regions, from Grasslands National Park to the Cypress Thescelosaurus assiniboiensis Hills. The species Thescelosaurus assiniboiensis, is known only from the Frenchman River Valley and was first discovered in 1968. lived at the same time as Oligocene Tyrannosaurus rex. This was a time when lush vegetation dominated Saskatchewan, with forests dominated by deciduous conifers and broad leafed, flowering trees. The flora Eocene suggests a warm-temperate ago) years - 23 million (65 million to subtropical climate, with moderate seasonality (although it was never cold enough to freeze). Shallow streams and PALEOGENE rivers would have flowed Paleocene eastward to what remained of the Western Interior Seaway. Late This dinosaur was a herbivore, likely Food shearing tougher plant material with Preference: its bladed, interlocking teeth. (144 million - 65million years ago) years - 65million (144 million Early Thescelosaurus assiniboiensisis known from only one specimen, and that is from Saskatchewan. Currently, there is only one other species CRETACEOUS CRETACEOUS Relations of Thescelosaurus known from Saskatchewan, T. neglectus..
Recommended publications
  • New Heterodontosaurid Remains from the Cañadón Asfalto Formation: Cursoriality and the Functional Importance of the Pes in Small Heterodontosaurids
    Journal of Paleontology, 90(3), 2016, p. 555–577 Copyright © 2016, The Paleontological Society 0022-3360/16/0088-0906 doi: 10.1017/jpa.2016.24 New heterodontosaurid remains from the Cañadón Asfalto Formation: cursoriality and the functional importance of the pes in small heterodontosaurids Marcos G. Becerra,1 Diego Pol,1 Oliver W.M. Rauhut,2 and Ignacio A. Cerda3 1CONICET- Museo Palaeontológico Egidio Feruglio, Fontana 140, Trelew, Chubut 9100, Argentina 〈[email protected]〉; 〈[email protected]〉 2SNSB, Bayerische Staatssammlung für Paläontologie und Geologie and Department of Earth and Environmental Sciences, LMU München, Richard-Wagner-Str. 10, Munich 80333, Germany 〈[email protected]〉 3CONICET- Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Museo Carlos Ameghino, Belgrano 1700, Paraje Pichi Ruca (predio Marabunta), Cipolletti, Río Negro, Argentina 〈[email protected]〉 Abstract.—New ornithischian remains reported here (MPEF-PV 3826) include two complete metatarsi with associated phalanges and caudal vertebrae, from the late Toarcian levels of the Cañadón Asfalto Formation. We conclude that these fossil remains represent a bipedal heterodontosaurid but lack diagnostic characters to identify them at the species level, although they probably represent remains of Manidens condorensis, known from the same locality. Histological features suggest a subadult ontogenetic stage for the individual. A cluster analysis based on pedal measurements identifies similarities of this specimen with heterodontosaurid taxa and the inclusion of the new material in a phylogenetic analysis with expanded character sampling on pedal remains confirms the described specimen as a heterodontosaurid. Finally, uncommon features of the digits (length proportions among nonungual phalanges of digit III, and claw features) are also quantitatively compared to several ornithischians, theropods, and birds, suggesting that this may represent a bipedal cursorial heterodontosaurid with gracile and grasping feet and long digits.
    [Show full text]
  • A Phylogenetic Analysis of the Basal Ornithischia (Reptilia, Dinosauria)
    A PHYLOGENETIC ANALYSIS OF THE BASAL ORNITHISCHIA (REPTILIA, DINOSAURIA) Marc Richard Spencer A Thesis Submitted to the Graduate College of Bowling Green State University in partial fulfillment of the requirements of the degree of MASTER OF SCIENCE December 2007 Committee: Margaret M. Yacobucci, Advisor Don C. Steinker Daniel M. Pavuk © 2007 Marc Richard Spencer All Rights Reserved iii ABSTRACT Margaret M. Yacobucci, Advisor The placement of Lesothosaurus diagnosticus and the Heterodontosauridae within the Ornithischia has been problematic. Historically, Lesothosaurus has been regarded as a basal ornithischian dinosaur, the sister taxon to the Genasauria. Recent phylogenetic analyses, however, have placed Lesothosaurus as a more derived ornithischian within the Genasauria. The Fabrosauridae, of which Lesothosaurus was considered a member, has never been phylogenetically corroborated and has been considered a paraphyletic assemblage. Prior to recent phylogenetic analyses, the problematic Heterodontosauridae was placed within the Ornithopoda as the sister taxon to the Euornithopoda. The heterodontosaurids have also been considered as the basal member of the Cerapoda (Ornithopoda + Marginocephalia), the sister taxon to the Marginocephalia, and as the sister taxon to the Genasauria. To reevaluate the placement of these taxa, along with other basal ornithischians and more derived subclades, a phylogenetic analysis of 19 taxonomic units, including two outgroup taxa, was performed. Analysis of 97 characters and their associated character states culled, modified, and/or rescored from published literature based on published descriptions, produced four most parsimonious trees. Consistency and retention indices were calculated and a bootstrap analysis was performed to determine the relative support for the resultant phylogeny. The Ornithischia was recovered with Pisanosaurus as its basalmost member.
    [Show full text]
  • Smithsonian Miscellaneous Collections
    SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 61. NUMBER 5 A NEW DINOSAUR FROM THE LANCE FORMATION OF WYOMING BY CHARLES W. GILMORE (Publication 2184) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY 24, 1913 Z2>c £or6 <§aitimoxt (press BALTIMORE, Ml)., U. S. A. A NEW DINOSAUR FROM THE LANCE FORMATION OF WYOMING By CHARLES W. GILMORE ASSISTANT CURATOR OF FOSSIL RF.PTILES, U. S. NATIONAL MUSEUM INTRODUCTION In July, 189 1, Messrs. J. B. Hatcher and W. H. Utterback dis- covered in Wyoming an articulated skeleton of a small Orthopodous dinosaur. Until quite recently this specimen had remained in the original packing boxes and it was in the nature of a surprise upon first examination to discover that it represented an undescribed form. I therefore propose to make this animal the type of the new genus, Thescelosaurus. The present paper may be considered preliminary, as upon the completion of the preparatory work now in progress a more detailed account of the skeletal anatomy, and a discussion of its affinities, will be given. THESCELOSAURUS, new genus In the present communication the characters of this genus are included in the description that follows of Thescelosaurus neglcctus, the type species. THESCELOSAURUS NEGLECTUS, new species Type.—Cat. No. 7757, U. S. N. M. This specimen consists of a nearly complete articulated skeleton, the skull and neck being the only important parts missing. Type-locality.—Doegie Creek, Converse County, Wyoming. Paratype.—Cat. No. 7758, U. S. N. M. A second individual con- sisting of a few cervical, dorsal, and caudal vertebrae, portions of both scapulae, ribs, bones of fore and hind feet, and portions of limb bones.
    [Show full text]
  • A King-Size Theropod Coprolite
    See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/232796267 A king-size theropod coprolite Article in Nature · June 1998 DOI: 10.1038/31461 CITATIONS READS 154 2,385 4 authors, including: Karen Chin Tim Tokaryk University of Colorado Boulder Royal Saskatchewan Museum 32 PUBLICATIONS 1,143 CITATIONS 39 PUBLICATIONS 488 CITATIONS SEE PROFILE SEE PROFILE Some of the authors of this publication are also working on these related projects: The Dinosaur Park Formation of Saskatchewan View project Paleobiodiverity and the K-Pg Boundary View project All content following this page was uploaded by Tim Tokaryk on 10 June 2015. The user has requested enhancement of the downloaded file. letters to nature compositions, though the ground mass contains more silicon and aluminium (Table 2). X-ray powder-diffraction analyses indicate A king-sized theropod that carbonate fluorapatite is the predominant phosphate mineral in both the bone and the ground mass. coprolite Several factors confirm that this specimen is a coprolite. The most diagnostic feature is a phosphatic composition, which is character- Karen Chin, Timothy T. Tokaryk*, Gregory M. Erickson†‡ istic of carnivore coprolites9. As phosphorus normally constitutes & Lewis C. Calk 10 only about 0.1% of the Earth’s crustal rocks , concentrated phos- United States Geological Survey, 345 Middlefield Road, MS 975, Menlo Park, phate deposits usually indicate biotic accumulations, and the overall 8 California 94025, USA configuration of the mass is consistent with the irregular faecal * Eastend Fossil Research Station, Royal Saskatchewan Museum, Box 460, deposits produced by very large animals. The matrix-supported Eastend, Saskatchewan S0N 0T0, Canada distribution of bone fragments argues against the possibility that the † Department of Integrative Biology & Museums of Vertebrate Zoology and mass represents regurgitated material or fluvially aggregated bone Paleontology, University of California, Berkeley, California 94720, USA debris.
    [Show full text]
  • TGI Strat Column 2009.Cdr
    STRATIGRAPHIC CORRELATION CHART TGI II: Williston Basin Architecture and Hydrocarbon Potential in Eastern Saskatchewan and Western Manitoba EASTERN MANITOBA PERIOD MANITOBA SUBSURFACE SASKATCHEWAN OUTCROP ERA glacial drift glacial drift glacial drift Quaternary Wood Mountain Formation Peace Garden Peace Garden Member Tertiary Member Ravenscrag Formation CENOZOIC Formation Goodlands Member Formation Goodlands Member Turtle Mountain Turtle Mountain Turtle Frenchman Formation Whitemud Formation Boissevain Formation Boissevain Formation Eastend Formation Coulter Member Coulter Member Bearpaw Formation Odanah Member Belly River “marker” Odanah Member Belly River Formation “lower” Odanah Member Millwood Member Lea Park Formation Millwood Member MONTANA GROUP Pembina Member Pembina Member Pierre Shale Pierre Shale Milk River Formation Gammon Ferruginous Member Gammon Ferruginous Member Niobrara Formation Chalky Unit Boyne Member Boyne Member Boyne Calcareous Shale Unit Member Carlile Morden Member Carlile upper Formation Morden Member Formation Morden Member Carlile Formation Assiniboine Marco Calcarenite Assiniboine Member Member CRETACEOUS Second White Specks Laurier Limestone Beds Favel Favel Keld Keld Member Member Formation Formation Belle Fourche Formation Belle Fourche Member MESOZOIC COLORADO GROUP Belle Fourche Member upper Fish Scale Formation Fish Scale Zone upper Base of Fish Scale marker Base of Fish Scale marker Westgate Formation Westgate Member lower Westgate Member Newcastle Formation Newcastle Member lower Viking Sandstone
    [Show full text]
  • The Fauna from the Tyrannosaurus Rex Excavation, Frenchman Formation (Late Maastrichtian), Saskatchewan
    The Fauna from the Tyrannosaurus rex Excavation, Frenchman Formation (Late Maastrichtian), Saskatchewan Tim T. Tokaryk 1 and Harold N. Bryant 2 Tokaryk, T.T. and Bryant, H.N. (2004): The fauna from the Tyrannosaurus rex excavation, Frenchman Formation (Late Maastrichtian), Saskatchewan; in Summary of Investigations 2004, Volume 1, Saskatchewan Geological Survey, Sask. Industry Resources, Misc. Rep. 2004-4.1, CD-ROM, Paper A-18, 12p. Abstract The quarry that contained the partial skeleton of the Tyrannosaurus rex, familiarly known as “Scotty,” has yielded a diverse faunal and floral assemblage. The site is located in the Frenchman River valley in southwestern Saskatchewan and dates from approximately 65 million years, at the end of the Cretaceous Period. The faunal assemblage from the quarry is reviewed and the floral assemblage is summarized. Together, these assemblages provide some insight into the biological community that lived in southwestern Saskatchewan during the latest Cretaceous. Keywords: Frenchman Formation, Maastrichtian, Late Cretaceous, southwestern Saskatchewan, Tyrannosaurus rex. 1. Introduction a) Geological Setting The Frenchman Formation, of latest Maastrichtian age, is extensively exposed in southwestern Saskatchewan (Figure 1; Fraser et al., 1935; Furnival, 1950). The lithostratigraphic units in the formation consist largely of fluvial sandstones and greenish grey to green claystones. Outcrops of the Frenchman Formation are widely distributed in the Frenchman River valley, southeast of Eastend. Chambery Coulee, on the north side of the valley, includes Royal Saskatchewan Museum (RSM) locality 72F07-0022 (precise locality data on file with the RSM), the site that contained the disarticulated skeleton of a Tyrannosaurus rex. McIver (2002) subdivided the stratigraphic sequence at this locality into “lower” and “upper” beds.
    [Show full text]
  • The Rock Record – March 2005
    The Rock Record – March 2005 2004 Executive President Mike Gunning 787-2618 In This Issue Vice-President ¾ Speaker Program Announcements & Abstracts p. 1-3 Andre Costa 787-9104 ¾ Upcoming Events p. 4 ¾ AGM Recap & Honour Roll Citation p. 5,6 Secretary ¾ Curling Summary p. 7 Vacant Treasurer Bob Troyer 787-2562 Business Manager Wednesday, March 2nd, 2005 Jeff Coolican 787-0651 Program Chair Steve Whittaker 787-2577 Verdant, Volcanic Vistas on the Assistant Program Chair Island of St. Lucia, West Indies Kate MacLachlan 787-9059 Past President Erik Nickel 787-0169 Charlie Harper Northern Geological Survey School Liaison Committee Saskatchewan Industry and Resources Melinda Yurkowski 787-0650 Field Trip Committee Lancaster Room, Royal Canadian Legion John Lake 787-2621 Cash Bar: 11:30; Lunch: 11:50 Meeting: 12:15 – 13:00 Golf Tournament Committee Bob Troyer 787-2562 Members $7.00, Non-members $11.00 Contact: Andre Costa 787-9104 By NOON, Wednesday, January 26, 2005 Please contribute to the SGS Newsletter The SGS Newsletter is produced by the SGS executive. Wednesday, March 23, 2005 Letters, announcements, notices, comments, photos, news and information about SGS members, etc. are always T-Rex Excavation, Frenchman welcome. Call an executive member or write to us at: Formation, Southwest Saskatchewan Saskatchewan Geological Society Tim Tokaryk P.O. Box 234 Royal Saskatchewan Museum Fossil Research Station Regina, SK S4P 2Z6 Eastend, Saskatchewan SGS e-mail address: Lancaster Room, Royal Canadian Legion [email protected] Cash Bar: 11:30; Lunch: 11:50 Meeting: 12:15 – 13:00 SGS Website: Members $7.00, Non-members $11.00 www.sgshome.ca Contact: Andre Costa 787-9104 By NOON, Wednesday, January 26, 2005 All advertising inquiries should be directed to Andre Costa 1 Speakers Program; Mar.
    [Show full text]
  • Paleontological Discoveries in the Chorrillo Formation (Upper Campanian-Lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina
    Rev. Mus. Argentino Cienc. Nat., n.s. 21(2): 217-293, 2019 ISSN 1514-5158 (impresa) ISSN 1853-0400 (en línea) Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina Fernando. E. NOVAS1,2, Federico. L. AGNOLIN1,2,3, Sebastián ROZADILLA1,2, Alexis M. ARANCIAGA-ROLANDO1,2, Federico BRISSON-EGLI1,2, Matias J. MOTTA1,2, Mauricio CERRONI1,2, Martín D. EZCURRA2,5, Agustín G. MARTINELLI2,5, Julia S. D´ANGELO1,2, Gerardo ALVAREZ-HERRERA1, Adriel R. GENTIL1,2, Sergio BOGAN3, Nicolás R. CHIMENTO1,2, Jordi A. GARCÍA-MARSÀ1,2, Gastón LO COCO1,2, Sergio E. MIQUEL2,4, Fátima F. BRITO4, Ezequiel I. VERA2,6, 7, Valeria S. PEREZ LOINAZE2,6 , Mariela S. FERNÁNDEZ8 & Leonardo SALGADO2,9 1 Laboratorio de Anatomía Comparada y Evolución de los Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina - fernovas@yahoo. com.ar. 2 Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. 3 Fundación de Historia Natural “Felix de Azara”, Universidad Maimonides, Hidalgo 775, C1405BDB Buenos Aires, Argentina. 4 Laboratorio de Malacología terrestre. División Invertebrados Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina. 5 Sección Paleontología de Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina. 6 División Paleobotánica. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina. 7 Área de Paleontología. Departamento de Geología, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria (C1428EGA) Buenos Aires, Argentina. 8 Instituto de Investigaciones en Biodiversidad y Medioambiente (CONICET-INIBIOMA), Quintral 1250, 8400 San Carlos de Bariloche, Río Negro, Argentina.
    [Show full text]
  • A Census of Dinosaur Fossils Recovered from the Hell Creek and Lance Formations (Maastrichtian)
    The Journal of Paleontological Sciences: JPS.C.2019.01 1 TAKING COUNT: A Census of Dinosaur Fossils Recovered From the Hell Creek and Lance Formations (Maastrichtian). ______________________________________________________________________________________ Walter W. Stein- President, PaleoAdventures 1432 Mill St.. Belle Fourche, SD 57717. [email protected] 605-210-1275 ABSTRACT: A census of Hell Creek and Lance Formation dinosaur remains was conducted from April, 2017 through February of 2018. Online databases were reviewed and curators and collections managers interviewed in an effort to determine how much material had been collected over the past 130+ years of exploration. The results of this new census has led to numerous observations regarding the quantity, quality, and locations of the total collection, as well as ancillary data on the faunal diversity and density of Late Cretaceous dinosaur populations. By reviewing the available data, it was also possible to make general observations regarding the current state of certain exploration programs, the nature of collection bias present in those collections and the availability of today's online databases. A total of 653 distinct, associated and/or articulated remains (skulls and partial skeletons) were located. Ceratopsid skulls and partial skeletons (mostly identified as Triceratops) were the most numerous, tallying over 335+ specimens. Hadrosaurids (Edmontosaurus) were second with at least 149 associated and/or articulated remains. Tyrannosaurids (Tyrannosaurus and Nanotyrannus) were third with a total of 71 associated and/or articulated specimens currently known to exist. Basal ornithopods (Thescelosaurus) were also well represented by at least 42 known associated and/or articulated remains. The remaining associated and/or articulated specimens, included pachycephalosaurids (18), ankylosaurids (6) nodosaurids (6), ornithomimids (13), oviraptorosaurids (9), dromaeosaurids (1) and troodontids (1).
    [Show full text]
  • Competition Structured a Late Cretaceous Megaherbivorous Dinosaur Assemblage Jordan C
    www.nature.com/scientificreports OPEN Competition structured a Late Cretaceous megaherbivorous dinosaur assemblage Jordan C. Mallon 1,2 Modern megaherbivore community richness is limited by bottom-up controls, such as resource limitation and resultant dietary competition. However, the extent to which these same controls impacted the richness of fossil megaherbivore communities is poorly understood. The present study investigates the matter with reference to the megaherbivorous dinosaur assemblage from the middle to upper Campanian Dinosaur Park Formation of Alberta, Canada. Using a meta-analysis of 21 ecomorphological variables measured across 14 genera, contemporaneous taxa are demonstrably well-separated in ecomorphospace at the family/subfamily level. Moreover, this pattern is persistent through the approximately 1.5 Myr timespan of the formation, despite continual species turnover, indicative of underlying structural principles imposed by long-term ecological competition. After considering the implications of ecomorphology for megaherbivorous dinosaur diet, it is concluded that competition structured comparable megaherbivorous dinosaur communities throughout the Late Cretaceous of western North America. Te question of which mechanisms regulate species coexistence is fundamental to understanding the evolution of biodiversity1. Te standing diversity (richness) of extant megaherbivore (herbivores weighing ≥1,000 kg) com- munities appears to be mainly regulated by bottom-up controls2–4 as these animals are virtually invulnerable to top-down down processes (e.g., predation) when fully grown. Tus, while the young may occasionally succumb to predation, fully-grown African elephants (Loxodonta africana), rhinoceroses (Ceratotherium simum and Diceros bicornis), hippopotamuses (Hippopotamus amphibius), and girafes (Girafa camelopardalis) are rarely targeted by predators, and ofen show indiference to their presence in the wild5.
    [Show full text]
  • GEOL 104 Dinosaurs: a Natural History
    Name: GEOL 104 Dinosaurs: A Natural History Smithsonian Assignment I: Life on Land before the Dinosaurs, and the Dinosaurs Themselves! DUE: October 27 “Every man is a valuable member of society who by his observations, researches, and experiments procures knowledge for men.” -James Smithson (1765-1829), a British natural historian whose legacy of over $500,000 was given to the government of the United States of America for the creation of “an Establishment for the increase and diffusion of knowledge”: the Smithsonian Institution. The Smithsonian Institution’s National Museum of Natural History (NMNH) has one of the largest collections of dinosaur and other fossils in the world. The Smithsonian museums are free; hours for the NMNH are 10 am to 5:30 pm 7 days a week. You can take the Metro from the College Park Station to any of a number of stations near the Museum. The quickest route is the Green Line from the UMd-College Park Station to Archives/Navy Memorial: you don’t have to change trains, and the NMNH is just on the other side of the Archives Building. For this exercise you may wish to bring along the anatomy sheets handed out in class. You may work in teams and discuss your answers; however ALL WORK YOU TURN IN MUST BE YOUR OWN. (I have caught and reported a number of students in the past you have cheated by copying each other’s work: please don’t make me do that again…). To comply with University Senate regulations, please sign the following so that you may receive credit for this assignment.
    [Show full text]
  • A New Basal Ornithopod Dinosaur from the Lower Cretaceous of China
    A new basal ornithopod dinosaur from the Lower Cretaceous of China Yuqing Yang1,2,3, Wenhao Wu4,5, Paul-Emile Dieudonné6 and Pascal Godefroit7 1 College of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning, China 2 College of Paleontology, Shenyang Normal University, Shenyang, Liaoning, China 3 Key Laboratory for Evolution of Past Life and Change of Environment, Province of Liaoning, Shenyang Normal University, Shenyang, Liaoning, China 4 Key Laboratory for Evolution of Past Life and Environment in Northeast Asia, Ministry of Education, Jilin University, Changchun, Jilin, China 5 Research Center of Paleontology and Stratigraphy, Jilin University, Changchun, Jilin, China 6 Instituto de Investigación en Paleobiología y Geología, CONICET, Universidad Nacional de Río Negro, Rio Negro, Argentina 7 Directorate ‘Earth and History of Life’, Royal Belgian Institute of Natural Sciences, Brussels, Belgium ABSTRACT A new basal ornithopod dinosaur, based on two nearly complete articulated skeletons, is reported from the Lujiatun Beds (Yixian Fm, Lower Cretaceous) of western Liaoning Province (China). Some of the diagnostic features of Changmiania liaoningensis nov. gen., nov. sp. are tentatively interpreted as adaptations to a fossorial behavior, including: fused premaxillae; nasal laterally expanded, overhanging the maxilla; shortened neck formed by only six cervical vertebrae; neural spines of the sacral vertebrae completely fused together, forming a craniocaudally-elongated continuous bar; fused scapulocoracoid with prominent
    [Show full text]