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The Braincase, Brain and Palaeobiology of the Basal Sauropodomorph Dinosaur Thecodontosaurus Antiquus
applyparastyle “fig//caption/p[1]” parastyle “FigCapt” Zoological Journal of the Linnean Society, 2020, XX, 1–22. With 10 figures. Downloaded from https://academic.oup.com/zoolinnean/advance-article/doi/10.1093/zoolinnean/zlaa157/6032720 by University of Bristol Library user on 14 December 2020 The braincase, brain and palaeobiology of the basal sauropodomorph dinosaur Thecodontosaurus antiquus ANTONIO BALLELL1,*, J. LOGAN KING1, JAMES M. NEENAN2, EMILY J. RAYFIELD1 and MICHAEL J. BENTON1 1School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK 2Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, UK Received 27 May 2020; revised 15 October 2020; accepted for publication 26 October 2020 Sauropodomorph dinosaurs underwent drastic changes in their anatomy and ecology throughout their evolution. The Late Triassic Thecodontosaurus antiquus occupies a basal position within Sauropodomorpha, being a key taxon for documenting how those morphofunctional transitions occurred. Here, we redescribe the braincase osteology and reconstruct the neuroanatomy of Thecodontosaurus, based on computed tomography data. The braincase of Thecodontosaurus shares the presence of medial basioccipital components of the basal tubera and a U-shaped basioccipital–parabasisphenoid suture with other basal sauropodomorphs and shows a distinct combination of characters: a straight outline of the braincase floor, an undivided metotic foramen, an unossified gap, large floccular fossae, basipterygoid processes perpendicular to the cultriform process in lateral view and a rhomboid foramen magnum. We reinterpret these braincase features in the light of new discoveries in dinosaur anatomy. Our endocranial reconstruction reveals important aspects of the palaeobiology of Thecodontosaurus, supporting a bipedal stance and cursorial habits, with adaptations to retain a steady head and gaze while moving. -
Studies on Continental Late Triassic Tetrapod Biochronology. I. the Type Locality of Saturnalia Tupiniquim and the Faunal Succession in South Brazil
Journal of South American Earth Sciences 19 (2005) 205–218 www.elsevier.com/locate/jsames Studies on continental Late Triassic tetrapod biochronology. I. The type locality of Saturnalia tupiniquim and the faunal succession in south Brazil Max Cardoso Langer* Departamento de Biologia, FFCLRP, Universidade de Sa˜o Paulo (USP), Av. Bandeirantes 3900, 14040-901 Ribeira˜o Preto, SP, Brazil Received 1 November 2003; accepted 1 January 2005 Abstract Late Triassic deposits of the Parana´ Basin, Rio Grande do Sul, Brazil, encompass a single third-order, tetrapod-bearing sedimentary sequence that includes parts of the Alemoa Member (Santa Maria Formation) and the Caturrita Formation. A rich, diverse succession of terrestrial tetrapod communities is recorded in these sediments, which can be divided into at least three faunal associations. The stem- sauropodomorph Saturnalia tupiniquim was collected in the locality known as ‘Waldsanga’ near the city of Santa Maria. In that area, the deposits of the Alemoa Member yield the ‘Alemoa local fauna,’ which typifies the first association; includes the rhynchosaur Hyperodapedon, aetosaurs, and basal dinosaurs; and is coeval with the lower fauna of the Ischigualasto Formation, Bermejo Basin, NW Argentina. The second association is recorded in deposits of both the Alemoa Member and the Caturrita Formation, characterized by the rhynchosaur ‘Scaphonyx’ sulcognathus and the cynodont Exaeretodon, and correlated with the upper fauna of the Ischigualasto Formation. Various isolated outcrops of the Caturrita Formation yield tetrapod fossils that correspond to post-Ischigualastian faunas but might not belong to a single faunal association. The record of the dicynodont Jachaleria suggests correlations with the lower part of the Los Colorados Formation, NW Argentina, whereas remains of derived tritheledontid cynodonts indicate younger ages. -
Early Cretaceous) Wessex Formation of the Isle of Wight, Southern England
A new albanerpetontid amphibian from the Barremian (Early Cretaceous) Wessex Formation of the Isle of Wight, southern England STEVEN C. SWEETMAN and JAMES D. GARDNER Sweetman, S.C. and Gardner, J.D. 2013. A new albanerpetontid amphibian from the Barremian (Early Cretaceous) Wes− sex Formation of the Isle of Wight, southern England. Acta Palaeontologica Polonica 58 (2): 295–324. A new albanerpetontid, Wesserpeton evansae gen. et sp. nov., from the Early Cretaceous (Barremian) Wessex Formation of the Isle of Wight, southern England, is described. Wesserpeton is established on the basis of a unique combination of primitive and derived characters relating to the frontals and jaws which render it distinct from currently recognized albanerpetontid genera: Albanerpeton (Late Cretaceous to Pliocene of Europe, Early Cretaceous to Paleocene of North America and Late Cretaceous of Asia); Celtedens (Late Jurassic to Early Cretaceous of Europe); and Anoualerpeton (Middle Jurassic of Europe and Early Cretaceous of North Africa). Although Wesserpeton exhibits considerable intraspecific variation in characters pertaining to the jaws and, to a lesser extent, frontals, the new taxon differs from Celtedens in the shape of the internasal process and gross morphology of the frontals in dorsal or ventral view. It differs from Anoualerpeton in the lack of pronounced heterodonty of dentary and maxillary teeth; and in the more medial loca− tion and direction of opening of the suprapalatal pit. The new taxon cannot be referred to Albanerpeton on the basis of the morphology of the frontals. Wesserpeton currently represents the youngest record of Albanerpetontidae in Britain. Key words: Lissamphibia, Albanerpetontidae, microvertebrates, Cretaceous, Britain. Steven C. -
Valérie Martin, Varavudh Suteethorn & Eric Buffetaut, Description of the Type and Referred Material of Phuwiangosaurus
ORYCTOS, V ol . 2 : 39 - 91, Décembre 1999 DESCRIPTION OF THE TYPE AND REFERRED MATERIAL OF PHUWIANGOSAURUS SIRINDHORNAE MARTIN, BUFFETAUT AND SUTEETHORN, 1994, A SAUROPOD FROM THE LOWER CRETACEOUS OF THAILAND Valérie MARTIN 1, Varavudh SUTEETHORN 2 and Eric BUFFETAUT 3 1 Musée des Dinosaures, 11260 Espéraza, France 2 Geological Survey Division, Department of Mineral Resources, Rama VI Road, 10400 Bangkok, Thailand 3 CNRS (UMR 5561), 16 cour du Liégat, 75013 Paris, France Abstract : The type specimen of P. sirindhornae Martin, Buffetaut and Suteethorn, 1994 is an incomplete, partly articulated, skeleton discovered in the Phu Wiang area of northeastern Thailand). Most of the abundant sauropod material from the Sao Khua Formation (Early Cretaceous), collected on the Khorat Plateau, in northeastern Thailand, is referable to this species. Phuwiangosaurus is a middle-sized sauropod, which is clearly different from the Jurassic Chinese sauropods (Euhelopodidae). On the basis of a few jaw elements and teeth, P. sirindhornae may be considered as an early representative of the family Nemegtosauridae. Key words : Sauropoda, Osteology, Early Cretaceous, Thailand Description du type et du matériel rapporté de Phuwiangosaurus sirindhornae Martin, Buffetaut et Suteethorn, 1994, un sauropode du Crétacé inférieur de Thaïlande Résumé : Le spécimen type de Phuwiangosaurus sirindhornae est un squelette incomplet, partiellement articulé, découvert dans la région de Phu Wiang (Nord-Est de la Thaïlande). Phuwiangosaurus est un sauropode de taille moyenne (15 à 20 m de longueur) très différent des sauropodes du Jurassique chinois. La majeure partie de l’abondant matériel de sauropodes, récolté sur le Plateau de Khorat (Formation Sao Khua, Crétacé inférieur), est rap - portée à cette espèce. -
Dino Cards Project D E F List B
Daanosaurus Efraasia Dacentrurus Einiosaurus "Dachongosaurus" – nomen nudum Ekrixinatosaurus Daemonosaurus Elachistosuchus – a rhynchocephalian Dahalokely Elaltitan Dakosaurus – a metriorhynchid crocodilian Elaphrosaurus Dakotadon Elmisaurus Dakotaraptor Elopteryx - nomen dubium Daliansaurus Elosaurus – junior synonym of Brontosaurus "Damalasaurus" – nomen nudum Elrhazosaurus Dandakosaurus - nomen dubium "Elvisaurus" – nomen nudum; Cryolophosaurus Danubiosaurus – junior synonym of Struthiosaurus Emausaurus "Daptosaurus" – nomen nudum; early manuscript name for Deinonychus Embasaurus - theropoda incertae sedis Darwinsaurus - possible junior synonym of Huxleysaurus Enigmosaurus Dashanpusaurus Eoabelisaurus Daspletosaurus Eobrontosaurus – junior synonym of Brontosaurus Dasygnathoides – a non-dinosaurian archosaur, junior synonym Eocarcharia of Ornithosuchus Eoceratops – junior synonym of Chasmosaurus "Dasygnathus" – preoccupied name, now known as Dasygnathoides Eocursor Datanglong Eodromaeus Datonglong "Eohadrosaurus" – nomen nudum; Eolambia Datousaurus Eolambia Daurosaurus – synonym of Kulindadromeus Eomamenchisaurus Daxiatitan Eoplophysis - Dinosauria indet. Deinocheirus Eoraptor Deinodon – possibly Gorgosaurus Eosinopteryx - Avialae Deinonychus Eotrachodon Delapparentia - probable junior synonym of Iguanodon Eotriceratops Deltadromeus Eotyrannus Demandasaurus Eousdryosaurus Denversaurus Epachthosaurus Deuterosaurus – a therapsid Epanterias – may be Allosaurus Diabloceratops "Ephoenosaurus" – nomen nudum; Machimosaurus (a crocodilian) Diamantinasaurus -
Brains and Intelligence
BRAINS AND INTELLIGENCE The EQ or Encephalization Quotient is a simple way of measuring an animal's intelligence. EQ is the ratio of the brain weight of the animal to the brain weight of a "typical" animal of the same body weight. Assuming that smarter animals have larger brains to body ratios than less intelligent ones, this helps determine the relative intelligence of extinct animals. In general, warm-blooded animals (like mammals) have a higher EQ than cold-blooded ones (like reptiles and fish). Birds and mammals have brains that are about 10 times bigger than those of bony fish, amphibians, and reptiles of the same body size. The Least Intelligent Dinosaurs: The primitive dinosaurs belonging to the group sauropodomorpha (which included Massospondylus, Riojasaurus, and others) were among the least intelligent of the dinosaurs, with an EQ of about 0.05 (Hopson, 1980). Smartest Dinosaurs: The Troodontids (like Troödon) were probably the smartest dinosaurs, followed by the dromaeosaurid dinosaurs (the "raptors," which included Dromeosaurus, Velociraptor, Deinonychus, and others) had the highest EQ among the dinosaurs, about 5.8 (Hopson, 1980). The Encephalization Quotient was developed by the psychologist Harry J. Jerison in the 1970's. J. A. Hopson (a paleontologist from the University of Chicago) did further development of the EQ concept using brain casts of many dinosaurs. Hopson found that theropods (especially Troodontids) had higher EQ's than plant-eating dinosaurs. The lowest EQ's belonged to sauropods, ankylosaurs, and stegosaurids. A SECOND BRAIN? It used to be thought that the large sauropods (like Brachiosaurus and Apatosaurus) and the ornithischian Stegosaurus had a second brain. -
Note on the Sauropod and Theropod Dinosaurs from the Upper Cretaceous of Madagascar*
EXTRACT FROM THE BULLETIN DE LA SOCIÉTÉ GÉOLOGIQUE DE FRANCE 3rd series, volume XXIV, page 176, 1896. NOTE ON THE SAUROPOD AND THEROPOD DINOSAURS FROM THE UPPER CRETACEOUS OF MADAGASCAR* by Charles DEPÉRET. (PLATE VI). Translated by Matthew Carrano Department of Anatomical Sciences SUNY at Stony Brook, September 1999 The bones of large dinosaurian reptiles described in this work were brought to me by my good friend, Mr. Dr. Félix Salètes, primary physician for the Madagascar expedition, from the environs of Maevarana, where he was charged with installing a provisional hospital. This locality is situated on the right bank of the eastern arm of the Betsiboka, 46 kilometers south of Majunga, on the northwest coast of the island of Madagascar. Not having the time to occupy himself with paleontological studies, Dr. Salètes charged one of his auxiliary agents, Mr. Landillon, company sergeant-major of the marines, with researching the fossils in the environs of the Maevarana post. Thanks to the zeal and activity of Mr. Landillon, who was not afraid to gravely expose his health in these researches, I have been able to receive the precious bones of terrestrial reptiles that are the object of this note, along with an important series of fossil marine shells. I eagerly seize the opportunity here to thank Mr. Landillon for his important shipment and for the very precise geological data which he communicated to me concerning the environs of Maevarana, and of which I will now give a short sketch. 1st. Geology of Maevarana and placement of the localities. * Original reference: Depéret, C. -
Dinosaurs British Isles
DINOSAURS of the BRITISH ISLES Dean R. Lomax & Nobumichi Tamura Foreword by Dr Paul M. Barrett (Natural History Museum, London) Skeletal reconstructions by Scott Hartman, Jaime A. Headden & Gregory S. Paul Life and scene reconstructions by Nobumichi Tamura & James McKay CONTENTS Foreword by Dr Paul M. Barrett.............................................................................10 Foreword by the authors........................................................................................11 Acknowledgements................................................................................................12 Museum and institutional abbreviations...............................................................13 Introduction: An age-old interest..........................................................................16 What is a dinosaur?................................................................................................18 The question of birds and the ‘extinction’ of the dinosaurs..................................25 The age of dinosaurs..............................................................................................30 Taxonomy: The naming of species.......................................................................34 Dinosaur classification...........................................................................................37 Saurischian dinosaurs............................................................................................39 Theropoda............................................................................................................39 -
The Anatomy and Phylogenetic Relationships of Antetonitrus Ingenipes (Sauropodiformes, Dinosauria): Implications for the Origins of Sauropoda
THE ANATOMY AND PHYLOGENETIC RELATIONSHIPS OF ANTETONITRUS INGENIPES (SAUROPODIFORMES, DINOSAURIA): IMPLICATIONS FOR THE ORIGINS OF SAUROPODA Blair McPhee A dissertation submitted to the Faculty of Science, University of the Witwatersrand, in partial fulfilment of the requirements for the degree of Master of Science. Johannesburg, 2013 i ii ABSTRACT A thorough description and cladistic analysis of the Antetonitrus ingenipes type material sheds further light on the stepwise acquisition of sauropodan traits just prior to the Triassic/Jurassic boundary. Although the forelimb of Antetonitrus and other closely related sauropododomorph taxa retains the plesiomorphic morphology typical of a mobile grasping structure, the changes in the weight-bearing dynamics of both the musculature and the architecture of the hindlimb document the progressive shift towards a sauropodan form of graviportal locomotion. Nonetheless, the presence of hypertrophied muscle attachment sites in Antetonitrus suggests the retention of an intermediary form of facultative bipedality. The term Sauropodiformes is adopted here and given a novel definition intended to capture those transitional sauropodomorph taxa occupying a contiguous position on the pectinate line towards Sauropoda. The early record of sauropod diversification and evolution is re- examined in light of the paraphyletic consensus that has emerged regarding the ‘Prosauropoda’ in recent years. iii ACKNOWLEDGEMENTS First, I would like to express sincere gratitude to Adam Yates for providing me with the opportunity to do ‘real’ palaeontology, and also for gladly sharing his considerable knowledge on sauropodomorph osteology and phylogenetics. This project would not have been possible without the continued (and continual) support (both emotionally and financially) of my parents, Alf and Glenda McPhee – Thank you. -
Re-Description of the Sauropod Dinosaur Amanzia (“Ornithopsis
Schwarz et al. Swiss J Geosci (2020) 113:2 https://doi.org/10.1186/s00015-020-00355-5 Swiss Journal of Geosciences ORIGINAL PAPER Open Access Re-description of the sauropod dinosaur Amanzia (“Ornithopsis/Cetiosauriscus”) greppini n. gen. and other vertebrate remains from the Kimmeridgian (Late Jurassic) Reuchenette Formation of Moutier, Switzerland Daniela Schwarz1* , Philip D. Mannion2 , Oliver Wings3 and Christian A. Meyer4 Abstract Dinosaur remains were discovered in the 1860’s in the Kimmeridgian (Late Jurassic) Reuchenette Formation of Moutier, northwestern Switzerland. In the 1920’s, these were identifed as a new species of sauropod, Ornithopsis greppini, before being reclassifed as a species of Cetiosauriscus (C. greppini), otherwise known from the type species (C. stewarti) from the late Middle Jurassic (Callovian) of the UK. The syntype of “C. greppini” consists of skeletal elements from all body regions, and at least four individuals of diferent sizes can be distinguished. Here we fully re-describe this material, and re-evaluate its taxonomy and systematic placement. The Moutier locality also yielded a theropod tooth, and fragmen- tary cranial and vertebral remains of a crocodylomorph, also re-described here. “C.” greppini is a small-sized (not more than 10 m long) non-neosauropod eusauropod. Cetiosauriscus stewarti and “C.” greppini difer from each other in: (1) size; (2) the neural spine morphology and diapophyseal laminae of the anterior caudal vertebrae; (3) the length-to-height proportion in the middle caudal vertebrae; (4) the presence or absence of ridges and crests on the middle caudal cen- tra; and (5) the shape and proportions of the coracoid, humerus, and femur. -
Virginia Tidwell, Kenneth Carpenter & Williams Brooks, New
ORYCTOS, V ol . 2 : 21 - 37, Décembre 1999 NEW SAUROPOD FROM THE LOWER CRETACEOUS OF UTAH, USA Virginia TIDWELL, Kenneth CARPENTER and William BROOKS Department of Earth and Space Sciences, Denver Museum of Natural History, 2001 Colorado Blvd., Denver, CO 80205, USA. Abstract : The sauropod record for the Lower Cretaceous is poor in North America and consists mostly of iso - lated bones. Recently, however, a partial semiarticulated skeleton of a brachiosaurid, Cedarosaurus weiskopfae n.g., n.sp, was recovered from the Yellow Cat Member of the Cedar Mountain Formation, Utah, USA. The humeral leng - th is almost the same as the femur, while the dorsal and caudal vertebrae, and the metacarpal all display characters that identify the specimen as brachiosaurid. The forelimb and caudal vertebrae distinctly set it apart from all cur - rently described genera in that family. A brief review of Early to Middle Cretaceous brachiosaurs sorts through the confusing jumble of taxa that has developed over the years. In North America, most brachiosaurids found in Lower or Middle Cretaceous strata have historically been referred to the genus Pleurocoelus. The review illustrates the need for a reexamination of Pleurocoelus type material, as well as several specimens referred to that genus. Other material previously assigned to Pleurocoelus may yet prove to be the same as Cedarosaurus weiskopfae . Key words: Lower Cretaceous, brachiosaurid, new taxon, South-central United States. INTRODUCTION and several manus and pes elements. Only the proxi - mal end of the femur was recovered from the left side Until recently remains of Cretaceous sauropods and it is likely that all other elements were eroded in North America have been limited to the advanced away. -
The Pelvic and Hind Limb Anatomy of the Stem-Sauropodomorph Saturnalia Tupiniquim (Late Triassic, Brazil)
PaleoBios 23(2):1–30, July 15, 2003 © 2003 University of California Museum of Paleontology The pelvic and hind limb anatomy of the stem-sauropodomorph Saturnalia tupiniquim (Late Triassic, Brazil) MAX CARDOSO LANGER Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, BS8 1RJ Bristol, UK. Current address: Departamento de Biologia, Universidade de São Paulo (USP), Av. Bandeirantes, 3900 14040-901 Ribeirão Preto, SP, Brazil; [email protected] Three partial skeletons allow a nearly complete description of the sacrum, pelvic girdle, and hind limb of the stem- sauropodomorph Saturnalia tupiniquim, from the Late Triassic Santa Maria Formation, South Brazil. The new morphological data gathered from these specimens considerably improves our knowledge of the anatomy of basal dinosaurs, providing the basis for a reassessment of various morphological transformations that occurred in the early evolution of these reptiles. These include an increase in the number of sacral vertebrae, the development of a brevis fossa, the perforation of the acetabulum, the inturning of the femoral head, as well as various modifications in the insertion of the iliofemoral musculature and the tibio-tarsal articulation. In addition, the reconstruction of the pelvic musculature of Saturnalia, along with a study of its locomotion pattern, indicates that the hind limb of early dinosaurs did not perform only a fore-and-aft stiff rotation in the parasagittal plane, but that lateral and medial movements of the leg were also present and important. INTRODUCTION sisting of most of the presacral vertebral series, both sides Saturnalia tupiniquim was described in a preliminary of the pectoral girdle, right humerus, partial right ulna, right fashion by Langer et al.