DOCSLIB.ORG

The First Jurassic Theropod from the Sergi Formation, Jatobá Basin, Brazil

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

An Acad Bras Cienc (2021) 93(Suppl. 2): e20201557 DOI 10.1590/0001-3765202120201557 Anais da Academia Brasileira de Ciências | Annals of the Brazilian Academy of Sciences Printed ISSN 0001-3765 I Online ISSN 1678-2690 www.scielo.br/aabc | www.fb.com/aabcjournal PALEONTOLOGY The fi rst Jurassic theropod from the Running title: A Jurassic theropod Sergi Formation, Jatobá Basin, Brazil of Brazil KAMILA L.N. BANDEIRA, ARTHUR S. BRUM, RODRIGO V. PÊGAS, LUCY G. DE Academy Section: SOUZA, PAULO VICTOR LUIZ G.C. PEREIRA & ANDRÉ EDUARDO P. PINHEIRO PALEONTOLOGY Abstract: Archosaur osteological remains are abundant in Brazil, particularly from the Triassic and Cretaceous strata, but in Jurassic, the record is predominantly represented by ichnofossils. The Upper Jurassic archosaur records comprise the Paralligatoridae e20201557 Batrachomimus pastosbonensis, from the Pastos Bons Formation (Parnaíba Basin), remains of Mesoeucrocodylia from the Aliança Formation (Jatobá Basin), and fragments of Dinosauria from the Brejo Santo Formation (Araripe Basin) with a dubious assignment. 93 Here, we present the fi rst undoubted Dinosauria record for the Jurassic of Brazil, MCT (Suppl. 2) 2670-LE, a middle to distal caudal vertebra belonging to a theropod. MCT 2670-LE was 93(Suppl. 2) excavated in the 60s by prof. Ignacio Machado Brito, being primarily attributed to DOI strata of the Aliança Formation but the rock matrix involving the specimen allows us to 10.1590/0001-3765202120201557 correlate MCT 2670-LE to Sergi Formation, marking this specimen as the fi rst archosaur record of this unit. The caudal vertebra is assigned to Carcharodontosauria based on the hourglass shaped centrum and the deep and narrow ventral groove. The specimen provides new data to the paleogeographic distribution of carcharodontosaurians before the South America-Africa break-up, as well as understanding the theropod faunal turnover of paleoenvironments during the Jurassic-Cretaceous transition in Brazil. Key words: Theropoda, Carcharodontosauria, Caudal Vertebra, Upper Jurassic, Sergi For- mation, Jatobá Basin. INTRODUCTION & Langer 2011), due to the sedimentation and tectonic conditions unfavorable to the In Brazil, archosaur remains are well-known, preservation of bone elements (e.g., Milani 2007). especially those dating from the Mesozoic Era, This scenario makes challenging the study and the Triassic and Cretaceous deposits are the and the consequent interpretations of Jurassic main fossiliferous ones (Bittencourt & Langer fossil data on Brazil (e.g., Gallo & Brito 2004, 2011). The Cretaceous represents the most Gallo 2005, Bittencourt & Langer 2011). Thus, the expressive interval with abundant vertebrate Jurassic record for Brazil is best represented by fossil record (Bittencourt & Langer 2011, Brusatte the ichnofossils (e.g., Leonardi et al. 2007, but et al. 2017), both on the Lower (e.g, Pereira et al. see Table I), while the Araripe Basin (Brejo Santo 2020a, b) and Upper levels (e.g., Pinheiro et al. Formation and Missão Velha Formation), the 2018, Bandeira et al. 2019, Delcourt et al. 2020). Parnaíba Basin (Pastos Bons Formation) and Archosaurs are the predominant fossil records the Jatobá Basin (Aliança Formation), all from especially on the Upper Cretaceous strata Upper Jurassic, are the only units with tetrapod (Bandeira et al. 2018). However, rock exposures bone elements - mostly, archosaurs. The from the Brazilian Jurassic are scarce (Bittencourt Paralligatoridae Batrachomimus pastosbonensis An Acad Bras Cienc (2021) 93(Suppl. 2) KAMILA L.N. BANDEIRA et al. A JURASSIC THEROPOD OF BRAZIL Montefeltro et al. 2013, from the Pastos Bons 2670-LE is identified as a middle caudal vertebra Formation, is the only archosaur species of a carcharodontosaurian theropod. The new described so far for the Brazilian Jurassic specimen improves the understanding of the (Montefeltro et al. 2013). rare archorsaur remains from the Jurassic period Other records consist of small axial in Brazil. It is also possible to link MCT 2670-LE to elements (about 3-4 cm) found in the Brejo Santo theropods of other basins with Jurassic outcrops, Formation (Melo & Carvalho 2017), along with allowing an evaluation of the paleogeographic Mesoeucrocodylia teeth. These axial elements distribution of tetrapods recognized in these (which do not have a collection number) were formations, as well as the evolutionary and proposed as the first Dinosauria record for the faunal changes of paleoenvironments during Brazilian Jurassic (Melo & Carvalho 2017). However, the Jurassic-Cretaceous transition in Brazil. the authors provided no diagnostic feature for this classification, and the description of these elements is superficial. The specimen images HISTORICAL REMARKS also depict just a ventral view of the material, We describe a new fossil material collected close and more detailed comparisons become to the municipality of Petrolândia (Pernambuco) impossible. Due to the difficulty of knowing in 1962 by Prof. Dr Ignacio Machado Brito. the origin in which institution these specimens In the notes associated with the specimen, are allocated, as well as unclear diagnostic Brito mentioned that it was recovered in the characteristics that allow a more accurate margins of the São Francisco River upstream the systematic assignment, we assume here that the Petrolândia municipality. attribution to Dinosauria of these specimens This contribution is a tribute to Diogenes is doubtful. The Missão Velha Formation has de Almeida Campos, the paleontologist of the a rich fossil assemblage, including anurans, Museu de Ciências da Terra (Serviço Geológico do lizards, turtles, mesoeucrocodylians and even Brasil – CPRM), who had prof. Ignacio as advisor nonavian dinosaurs (sensu Brito et al. 1994), but and paleontology undergraduate professor. most elements require a formal description and Ignacio led Diogenes to his first collecting fossils systematic review. fieldwork at this same region. Besides this, Finally, for the Upper Jurassic of Aliança Diogenes made a prospect in the area in the Formation, there is a brief report of some 1980s aiming for the rescue of paleontological Mesoeucrocodylia remains (Silva et al. 2011) material prior to the construction of the Luis which are more recently reviewed and described Gonzaga hydroelectric plan. Therefore, the together with new mesoeucrocodylian findings material here described connects Diogenes with (Carvalho et al. 2021). Thus, we present the first his past advisor and to a region on which he had confirmed Dinosauria record for the Jurassic important historical action. of Brazil, MCT 2670-LE, collected in 1962 by prof. Ignacio Machado Brito at São Francisco riverbank (see Geological Settings). MCT An Acad Bras Cienc (2021) 93(Suppl. 2) e20201557 2 | 30 KAMILA L.N. BANDEIRA et al. A JURASSIC THEROPOD OF BRAZIL Table I. Jurassic sedimentary basins in Brazil, and their respective fossil contents, (when found). Abbreviations: Fm, Formation, Mb, Member. lithology geological distribution fossil record age references unit and depositional context Parecis Basin fine-grained to southeast of Schobbenhaus et aphanitic basalts, Rondônia (RO) to al. 1984, Marzoli et with subordinate Lower Jurassic - Fm. Anari the Northwest of no fossils related al. 1999, Silva et al. coarsed diabase Hettangian Mato Grosso (MT) 2003. Pedreira & bodies. Volcanic state Bahia 2004 flows similar to basalts from Schobbenhaus et comprises the Anari Formation, al. 1984, Marzoli et Fm Tapirapuã massif in Lower Jurassic - with columnar no fossils related al. 1999, Silva et al. Tapirapuã Mato Grosso (MT) Hettangian disjunction 2003. Pedreira & state and spheroidal Bahia 2004 exfoliation Outcrops in north reddish, friable of General Carneiro, and eolic in the valley of sandstones with Silva et al. 2003, Fm Rio Ávila the Culuene river no macrofossils related Jurassic rounded grains, Bahia, 2007 and northwest well to poorly of Vilhena, Mato selected Grosso (MT) state Outcrops in West of large scale cross- Rondônia (RO) and bedded bimodal no macrofossils or Pedreira & Bahia Fm. Botucatu small exposures in Jurassic sandstones. ichnofossils related 2000, 2004 southeast of Mato Aeolian dunes Grosso (MT) Parnaíba Basin arround the tholeiitic Schobbenhaus et municipality flood basalts, Lower–Middle al. 1984, Bellieni et Fm Mosquito of Fortaleza no macrofossils related interbedded with Jurassic al. 1992, Santos & dos Nogueiras, sandstones Carvalho 2004 Maranhão (MA) state Alparcata Basin for the base, se- ostracods; quences of conchostracans; siltstone, dark palynomorphs; shale, and occurs as a south- central belt in plant cuticles; Schobbenhaus et greenish and fishes Lepidotus( Upper Jurassic - Fm Pastos brownish mud- Maranhão (MA) al. 1984, Gallo, 2005, Bons state, with some piauhyensis, probable Oxfordian– Montefeltro et al. stones. The upper exposure in west of Semionotus and Kimmeridgian 2013 strata consist Piauí (PI) pleuropholids); of gray to green Crocodyliformes shales with wavy (i.e., Batrachomimus lamination pastosbonensis); An Acad Bras Cienc (2021) 93(Suppl. 2) e20201557 3 | 30 KAMILA L.N. BANDEIRA et al. A JURASSIC THEROPOD OF BRAZIL Table I. Continuation Paraná Basin widespread abundant ichnofossils: mostly composed occurrence in the as footprints and of fine-to Paraná Basin, which tracks produced cover great áreas by invertebrates Schobbenhaus et medium-grained of São Paulo (SP), (arachnids and insects) al. 1984, Scherer, quartz sandstones. Paraná (PR), Santa and tetrapods (small 2000, Friable, rounded Catarina
Recommended publications
  • JVP 26(3) September 2006—ABSTRACTS

    JVP 26(3) September 2006—ABSTRACTS

    Neoceti Symposium, Saturday 8:45 acid-prepared osteolepiforms Medoevia and Gogonasus has offered strong support for BODY SIZE AND CRYPTIC TROPHIC SEPARATION OF GENERALIZED Jarvik’s interpretation, but Eusthenopteron itself has not been reexamined in detail. PIERCE-FEEDING CETACEANS: THE ROLE OF FEEDING DIVERSITY DUR- Uncertainty has persisted about the relationship between the large endoskeletal “fenestra ING THE RISE OF THE NEOCETI endochoanalis” and the apparently much smaller choana, and about the occlusion of upper ADAM, Peter, Univ. of California, Los Angeles, Los Angeles, CA; JETT, Kristin, Univ. of and lower jaw fangs relative to the choana. California, Davis, Davis, CA; OLSON, Joshua, Univ. of California, Los Angeles, Los A CT scan investigation of a large skull of Eusthenopteron, carried out in collaboration Angeles, CA with University of Texas and Parc de Miguasha, offers an opportunity to image and digital- Marine mammals with homodont dentition and relatively little specialization of the feeding ly “dissect” a complete three-dimensional snout region. We find that a choana is indeed apparatus are often categorized as generalist eaters of squid and fish. However, analyses of present, somewhat narrower but otherwise similar to that described by Jarvik. It does not many modern ecosystems reveal the importance of body size in determining trophic parti- receive the anterior coronoid fang, which bites mesial to the edge of the dermopalatine and tioning and diversity among predators. We established relationships between body sizes of is received by a pit in that bone. The fenestra endochoanalis is partly floored by the vomer extant cetaceans and their prey in order to infer prey size and potential trophic separation of and the dermopalatine, restricting the choana to the lateral part of the fenestra.
  • For Peer Review

    For Peer Review

    Earth and Environmental Science Transactions of the Royal Society of Edinburgh For Peer Review An unusual small -bodied crocodyliform from the Middle Jurassic of Scotland, UK, and potential evidence for an early diversification of advanced neosuchians Earth and Environmental Science Transactions of the Royal Society of Journal: Edinburgh Manuscript ID Draft Manuscript Type: Spontaneous Article Date Submitted by the Author: n/a Complete List of Authors: Yi, Hong-yu; Grant Institute, School of Geosciences; Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology Tennant, Jonathan; Imperial College London, Earth Science and Engineering Young, Mark; University of Edinburgh, School of GeoSciences Challands, Thomas; University of Edinburgh, School of GeoSciences Foffa, Davide; Grant Institute, School of Geosciences Hudson, John; University of Leicester, Department of Geology Ross, Dugald; Staffin Museum, Earth Sciences Brusatte, Stephen; Grant Institute, School of Geosciences; National Museums Scotland, Earth Sciences Keywords: Isle of Skye, Mesozoic, Duntulm Formation, Eusuchia origin Cambridge University Press Page 1 of 40 Earth and Environmental Science Transactions of the Royal Society of Edinburgh 1 An unusual small-bodied crocodyliform from the Middle Jurassic of Scotland, UK, and potential evidence for an early diversification of advanced neosuchians HONGYU YI 1, 2 , JONATHAN P. TENNANT 3*, MARK T. YOUNG 1, THOMAS J. CHALLANDS 1, DAVIDE FOFFA 1, JOHN D. HUDSON 4, DUGALD A. ROSS 5, and STEPHEN L. BRUSATTE
  • Sereno 20060098.Vp

    Sereno 20060098.Vp

    Basal abelisaurid and carcharodontosaurid theropods from the Lower Cretaceous Elrhaz Formation of Niger PAUL C. SERENO and STEPHEN L. BRUSATTE Sereno, P.C. and Brusatte, S.L. 2008. Basal abelisaurid and carcharodontosaurid theropods from the Lower Cretaceous Elrhaz Formation of Niger. Acta Palaeontologica Polonica 53 (1): 15–46. We report the discovery of basal abelisaurid and carcharodontosaurid theropods from the mid Cretaceous (Aptian– Albian, ca. 112 Ma) Elrhaz Formation of the Niger Republic. The abelisaurid, Kryptops palaios gen. et sp. nov., is repre− sented by a single individual preserving the maxilla, pelvic girdle, vertebrae and ribs. Several features, including a maxilla textured externally by impressed vascular grooves and a narrow antorbital fossa, clearly place Kryptops palaios within Abelisauridae as its oldest known member. The carcharodontosaurid, Eocarcharia dinops gen. et sp. nov., is repre− sented by several cranial bones and isolated teeth. Phylogenetic analysis places it as a basal carcharodontosaurid, similar to Acrocanthosaurus and less derived than Carcharodontosaurus and Giganotosaurus. The discovery of these taxa sug− gests that large body size and many of the derived cranial features of abelisaurids and carcharodontosaurids had already evolved by the mid Cretaceous. The presence of a close relative of the North American genus Acrocanthosaurus on Af− rica suggests that carcharodontosaurids had already achieved a trans−Tethyan distribution by the mid Cretaceous. Key words: Theropod, abelisaurid, allosauroid, carcharodontosaurid, Kryptops, Eocarcharia, Cretaceous, Africa. Paul C. Sereno [[email protected]], Department of Organismal Biology and Anatomy, University of Chicago, 1027 E. 57th Street, Chicago, Illinois, 60637, USA; Stephen L. Brusatte [[email protected]], Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, United Kingdom.
  • Water Diversion in Brazil Threatens Biodiversit

    Water Diversion in Brazil Threatens Biodiversit

    See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/332470352 Water diversion in Brazil threatens biodiversity Article in AMBIO A Journal of the Human Environment · April 2019 DOI: 10.1007/s13280-019-01189-8 CITATIONS READS 0 992 12 authors, including: Vanessa Daga Valter Monteiro de Azevedo-Santos Universidade Federal do Paraná 34 PUBLICATIONS 374 CITATIONS 17 PUBLICATIONS 248 CITATIONS SEE PROFILE SEE PROFILE Fernando Pelicice Philip Fearnside Universidade Federal de Tocantins Instituto Nacional de Pesquisas da Amazônia 68 PUBLICATIONS 2,890 CITATIONS 612 PUBLICATIONS 20,906 CITATIONS SEE PROFILE SEE PROFILE Some of the authors of this publication are also working on these related projects: Freshwater microscrustaceans from continental Ecuador and Galápagos Islands: Integrative taxonomy and ecology View project Conservation policy View project All content following this page was uploaded by Philip Fearnside on 11 May 2019. The user has requested enhancement of the downloaded file. The text that follows is a PREPRINT. O texto que segue é um PREPRINT. Please cite as: Favor citar como: Daga, Vanessa S.; Valter M. Azevedo- Santos, Fernando M. Pelicice, Philip M. Fearnside, Gilmar Perbiche-Neves, Lucas R. P. Paschoal, Daniel C. Cavallari, José Erickson, Ana M. C. Ruocco, Igor Oliveira, André A. Padial & Jean R. S. Vitule. 2019. Water diversion in Brazil threatens biodiversity: Potential problems and alternatives. Ambio https://doi.org/10.1007/s13280-019- 01189-8 . (online version published 27 April 2019) ISSN: 0044-7447 (print version) ISSN: 1654-7209 (electronic version) Copyright: Royal Swedish Academy of Sciences & Springer Science+Business Media B.V.
  • Triassic- Jurassic Stratigraphy Of

    Triassic- Jurassic Stratigraphy Of

    Triassic- Jurassic Stratigraphy of the <JF C7 JL / Culpfeper and B arbour sville Basins, VirginiaC7 and Maryland/ ll.S. PAPER Triassic-Jurassic Stratigraphy of the Culpeper and Barboursville Basins, Virginia and Maryland By K.Y. LEE and AJ. FROELICH U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1472 A clarification of the Triassic--Jurassic stratigraphic sequences, sedimentation, and depositional environments UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1989 DEPARTMENT OF THE INTERIOR MANUEL LUJAN, Jr., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government Library of Congress Cataloging in Publication Data Lee, K.Y. Triassic-Jurassic stratigraphy of the Culpeper and Barboursville basins, Virginia and Maryland. (U.S. Geological Survey professional paper ; 1472) Bibliography: p. Supt. of Docs. no. : I 19.16:1472 1. Geology, Stratigraphic Triassic. 2. Geology, Stratigraphic Jurassic. 3. Geology Culpeper Basin (Va. and Md.) 4. Geology Virginia Barboursville Basin. I. Froelich, A.J. (Albert Joseph), 1929- II. Title. III. Series. QE676.L44 1989 551.7'62'09755 87-600318 For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, CO 80225 CONTENTS Page Page Abstract.......................................................................................................... 1 Stratigraphy Continued Introduction... ..........................................................................................
  • The Geologic Time Scale Is the Eon

    The Geologic Time Scale Is the Eon

    Exploring Geologic Time Poster Illustrated Teacher's Guide #35-1145 Paper #35-1146 Laminated Background Geologic Time Scale Basics The history of the Earth covers a vast expanse of time, so scientists divide it into smaller sections that are associ- ated with particular events that have occurred in the past.The approximate time range of each time span is shown on the poster.The largest time span of the geologic time scale is the eon. It is an indefinitely long period of time that contains at least two eras. Geologic time is divided into two eons.The more ancient eon is called the Precambrian, and the more recent is the Phanerozoic. Each eon is subdivided into smaller spans called eras.The Precambrian eon is divided from most ancient into the Hadean era, Archean era, and Proterozoic era. See Figure 1. Precambrian Eon Proterozoic Era 2500 - 550 million years ago Archaean Era 3800 - 2500 million years ago Hadean Era 4600 - 3800 million years ago Figure 1. Eras of the Precambrian Eon Single-celled and simple multicelled organisms first developed during the Precambrian eon. There are many fos- sils from this time because the sea-dwelling creatures were trapped in sediments and preserved. The Phanerozoic eon is subdivided into three eras – the Paleozoic era, Mesozoic era, and Cenozoic era. An era is often divided into several smaller time spans called periods. For example, the Paleozoic era is divided into the Cambrian, Ordovician, Silurian, Devonian, Carboniferous,and Permian periods. Paleozoic Era Permian Period 300 - 250 million years ago Carboniferous Period 350 - 300 million years ago Devonian Period 400 - 350 million years ago Silurian Period 450 - 400 million years ago Ordovician Period 500 - 450 million years ago Cambrian Period 550 - 500 million years ago Figure 2.
  • Invertebrate Ichnofossils from the Adamantina Formation (Bauru Basin, Late Cretaceous), Brazil

    Invertebrate Ichnofossils from the Adamantina Formation (Bauru Basin, Late Cretaceous), Brazil

    Rev. bras. paleontol. 9(2):211-220, Maio/Agosto 2006 © 2006 by the Sociedade Brasileira de Paleontologia INVERTEBRATE ICHNOFOSSILS FROM THE ADAMANTINA FORMATION (BAURU BASIN, LATE CRETACEOUS), BRAZIL ANTONIO CARLOS SEQUEIRA FERNANDES Departamento de Geologia e Paleontologia, Museu Nacional, UFRJ, Quinta da Boa Vista, São Cristóvão, 20940-040, Rio de Janeiro, RJ, Brazil. [email protected] ISMAR DE SOUZA CARVALHO Departamento de Geologia, Instituto de Geociências, UFRJ, 21949-900, Cidade Universitária, Rio de Janeiro, RJ, Brazil. [email protected] ABSTRACT – The Bauru Group is a sequence at least 300 m in thickness, of Cretaceous age (Turonian- Maastrichtian), located in southeastern Brazil (Bauru Basin), and consists of three formations, namely Adamantina, Uberaba and Marília. Throughout the Upper Cretaceous, there was an alternation between severely hot dry and rainy seasons, and a diverse fauna and flora was established in the basin. The ichnofossils studied were found in the Adamantina Formation outcrops and were identified as Arenicolites isp., ?Macanopsis isp., Palaeophycus heberti and Taenidium barretti, which reveal the burrowing behavior of the endobenthic invertebrates. There are also other biogenic structures such as plant root traces, coprolites and vertebrate fossil egg nests. The Adamantina Formation (Turonian-Santonian) is a sequence of fine sandstones, mudstones, siltstones and muddy sandstones, whose sediments are interpreted as deposited in exposed channel-bars and floodplains associated areas of braided fluvial environments. Key words: Bauru Basin, ichnofossils, late Cretaceous, continental palaeoenvironments, Adamantina Formation. RESUMO – O Grupo Bauru é uma seqüência de pelo menos 300 m de espessura, de idade cretácica (Turoniano- Maastrichtiano), localizada no Sudeste do Brasil (bacia Bauru), e consiste das formações Adamantina, Uberaba e Marília.
  • Evaluating the Ecology of Spinosaurus: Shoreline Generalist Or Aquatic Pursuit Specialist?

    Evaluating the Ecology of Spinosaurus: Shoreline Generalist Or Aquatic Pursuit Specialist?

    Palaeontologia Electronica palaeo-electronica.org Evaluating the ecology of Spinosaurus: Shoreline generalist or aquatic pursuit specialist? David W.E. Hone and Thomas R. Holtz, Jr. ABSTRACT The giant theropod Spinosaurus was an unusual animal and highly derived in many ways, and interpretations of its ecology remain controversial. Recent papers have added considerable knowledge of the anatomy of the genus with the discovery of a new and much more complete specimen, but this has also brought new and dramatic interpretations of its ecology as a highly specialised semi-aquatic animal that actively pursued aquatic prey. Here we assess the arguments about the functional morphology of this animal and the available data on its ecology and possible habits in the light of these new finds. We conclude that based on the available data, the degree of adapta- tions for aquatic life are questionable, other interpretations for the tail fin and other fea- tures are supported (e.g., socio-sexual signalling), and the pursuit predation hypothesis for Spinosaurus as a “highly specialized aquatic predator” is not supported. In contrast, a ‘wading’ model for an animal that predominantly fished from shorelines or within shallow waters is not contradicted by any line of evidence and is well supported. Spinosaurus almost certainly fed primarily from the water and may have swum, but there is no evidence that it was a specialised aquatic pursuit predator. David W.E. Hone. Queen Mary University of London, Mile End Road, London, E1 4NS, UK. [email protected] Thomas R. Holtz, Jr. Department of Geology, University of Maryland, College Park, Maryland 20742 USA and Department of Paleobiology, National Museum of Natural History, Washington, DC 20560 USA.
  • Implications for Predatory Dinosaur Macroecology and Ontogeny in Later Late Cretaceous Asiamerica

    Implications for Predatory Dinosaur Macroecology and Ontogeny in Later Late Cretaceous Asiamerica

    Canadian Journal of Earth Sciences Theropod Guild Structure and the Tyrannosaurid Niche Assimilation Hypothesis: Implications for Predatory Dinosaur Macroecology and Ontogeny in later Late Cretaceous Asiamerica Journal: Canadian Journal of Earth Sciences Manuscript ID cjes-2020-0174.R1 Manuscript Type: Article Date Submitted by the 04-Jan-2021 Author: Complete List of Authors: Holtz, Thomas; University of Maryland at College Park, Department of Geology; NationalDraft Museum of Natural History, Department of Geology Keyword: Dinosaur, Ontogeny, Theropod, Paleocology, Mesozoic, Tyrannosauridae Is the invited manuscript for consideration in a Special Tribute to Dale Russell Issue? : © The Author(s) or their Institution(s) Page 1 of 91 Canadian Journal of Earth Sciences 1 Theropod Guild Structure and the Tyrannosaurid Niche Assimilation Hypothesis: 2 Implications for Predatory Dinosaur Macroecology and Ontogeny in later Late Cretaceous 3 Asiamerica 4 5 6 Thomas R. Holtz, Jr. 7 8 Department of Geology, University of Maryland, College Park, MD 20742 USA 9 Department of Paleobiology, National Museum of Natural History, Washington, DC 20013 USA 10 Email address: [email protected] 11 ORCID: 0000-0002-2906-4900 Draft 12 13 Thomas R. Holtz, Jr. 14 Department of Geology 15 8000 Regents Drive 16 University of Maryland 17 College Park, MD 20742 18 USA 19 Phone: 1-301-405-4084 20 Fax: 1-301-314-9661 21 Email address: [email protected] 22 23 1 © The Author(s) or their Institution(s) Canadian Journal of Earth Sciences Page 2 of 91 24 ABSTRACT 25 Well-sampled dinosaur communities from the Jurassic through the early Late Cretaceous show 26 greater taxonomic diversity among larger (>50kg) theropod taxa than communities of the 27 Campano-Maastrichtian, particularly to those of eastern/central Asia and Laramidia.
  • The Baurusuchidae Vs Theropoda Record in the Bauru Group (Upper Cretaceous, Brazil): a Taphonomic Perspective

    The Baurusuchidae Vs Theropoda Record in the Bauru Group (Upper Cretaceous, Brazil): a Taphonomic Perspective

    Journal of Iberian Geology https://doi.org/10.1007/s41513-018-0048-4 RESEARCH PAPER The Baurusuchidae vs Theropoda record in the Bauru Group (Upper Cretaceous, Brazil): a taphonomic perspective Kamila L. N. Bandeira1 · Arthur S. Brum1 · Rodrigo V. Pêgas1 · Giovanne M. Cidade2 · Borja Holgado1 · André Cidade1 · Rafael Gomes de Souza1 Received: 31 July 2017 / Accepted: 23 January 2018 © Springer International Publishing AG, part of Springer Nature 2018 Abstract Purpose The Bauru Group is worldwide known due to its high diversity of archosaurs, especially that of Crocodyliformes. Recently, it has been suggested that the Crocodyliformes, especially the Baurusuchidae, were the top predators of the Bauru Group, based on their anatomical convergence with theropods and the dearth of those last ones in the fossil record of this geological group. Methods Here, we erect the hypothesis that assumption is taphonomically biased. For this purpose, we made a literature survey on all the published specimens of Theropoda, Baurusuchidae and Titanosauria from all geological units from the Bauru Group. Also, we gathered data from the available literature, and we classifed each fossil fnd under a taphonomic class proposed on this work. Results We show that those groups have diferent degrees of bone representativeness and diferent qualities of preservation pattern. Also, we suggest that baurusuchids lived close to or in the abundant food plains, which explains the good preserva- tion of their remains. Theropods and titanosaurs did not live in association with such environments and the quality of their preservation has thus been negatively afected. Conclusions We support the idea that the Baurusuchidae played an important role in the food chain of the ecological niches of the Late Cretaceous Bauru Group, but the possible biases in their fossil record relative to Theropoda do not support the conclusion that baurusuchids outcompeted theropods.
  • Freshwater Bivalve (Unioniformes) Diversity, Systematics, and Evolution: Status and Future Directions Arthur E

    Freshwater Bivalve (Unioniformes) Diversity, Systematics, and Evolution: Status and Future Directions Arthur E

    Natural Resource Ecology and Management Natural Resource Ecology and Management Publications 6-2008 Freshwater bivalve (Unioniformes) diversity, systematics, and evolution: status and future directions Arthur E. Bogan North Carolina State Museum of Natural Sciences Kevin J. Roe Iowa State University, [email protected] Follow this and additional works at: http://lib.dr.iastate.edu/nrem_pubs Part of the Evolution Commons, Genetics Commons, Marine Biology Commons, Natural Resources Management and Policy Commons, and the Terrestrial and Aquatic Ecology Commons The ompc lete bibliographic information for this item can be found at http://lib.dr.iastate.edu/ nrem_pubs/29. For information on how to cite this item, please visit http://lib.dr.iastate.edu/ howtocite.html. This Article is brought to you for free and open access by the Natural Resource Ecology and Management at Iowa State University Digital Repository. It has been accepted for inclusion in Natural Resource Ecology and Management Publications by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Freshwater bivalve (Unioniformes) diversity, systematics, and evolution: status and future directions Abstract Freshwater bivalves of the order Unioniformes represent the largest bivalve radiation in freshwater. The unioniform radiation is unique in the class Bivalvia because it has an obligate parasitic larval stage on the gills or fins of fish; it is divided into 6 families, 181 genera, and ∼800 species. These families are distributed across 6 of the 7 continents and represent the most endangered group of freshwater animals alive today. North American unioniform bivalves have been the subject of study and illustration since Martin Lister, 1686, and over the past 320 y, significant gains have been made in our understanding of the evolutionary history and systematics of these animals.
  • Taxonomic Reappraisal of the Sphagesaurid Crocodyliform Sphagesaurus Montealtensis from the Late Cretaceous Adamantina Formation of São Paulo State, Brazil

    Taxonomic Reappraisal of the Sphagesaurid Crocodyliform Sphagesaurus Montealtensis from the Late Cretaceous Adamantina Formation of São Paulo State, Brazil

    Zootaxa 3686 (2): 183–200 ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ Article ZOOTAXA Copyright © 2013 Magnolia Press ISSN 1175-5334 (online edition) http://dx.doi.org/10.11646/zootaxa.3686.2.4 http://zoobank.org/urn:lsid:zoobank.org:pub:9F87DAC0-E2BE-4282-A4F7-86258B0C8668 Taxonomic reappraisal of the sphagesaurid crocodyliform Sphagesaurus montealtensis from the Late Cretaceous Adamantina Formation of São Paulo State, Brazil FABIANO VIDOI IORI¹,², THIAGO DA SILVA MARINHO3, ISMAR DE SOUZA CARVALHO¹ & ANTONIO CELSO DE ARRUDA CAMPOS² 1UFRJ, Departamento de Geologia, CCMN/IGEO, Cidade Universitária – Ilha do Fundão, 21949-900. Rio de Janeiro, Brazil. E-mail: [email protected]; [email protected] 2Museu de Paleontologia “Prof. Antonio Celso de Arruda Campos”, Praça do Centenário s/n, Centro, 15910-000 – Monte Alto, Brazil 3Instituto de Ciências Exatas, Naturais e Educação (ICENE), Universidade Federal do Triângulo Mineiro (UFTM), Av. Dr. Randolfo Borges Jr. 1700 , Univerdecidade, 38064-200, Uberaba, Minas Gerais, Brasil. [email protected] Abstract Sphagesaurus montealtensis is a sphagesaurid whose original description was based on a comparison with Sphagesaurus huenei, the only species of the clade described to that date. Better preparation of the holotype and the discovery of a new specimen have allowed the review of some characteristics and the identification of several synapomorphies of S. mon- tealtensis with the genus Caipirasuchus: presence of antorbital fenestra; external nares bordered only by the premaxillae;