Age of Reptiles
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Life History of the Critically Endangered Largetooth Sawfish: a Compilation of Data for Population Assessment and Demographic Modelling
Vol. 44: 79–88, 2021 ENDANGERED SPECIES RESEARCH Published January 28 https://doi.org/10.3354/esr01090 Endang Species Res OPEN ACCESS Life history of the Critically Endangered largetooth sawfish: a compilation of data for population assessment and demographic modelling P. M. Kyne1,*, M. Oetinger2, M. I. Grant3, P. Feutry4 1Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory 0909, Australia 2Argus-Mariner Consulting Scientists, Owensboro, Kentucky 42301, USA 3Centre for Sustainable Tropical Fisheries and Aquaculture and College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia 4CSIRO Oceans and Atmosphere, Hobart, Tasmania 7000, Australia ABSTRACT: The largetooth sawfish Pristis pristis is a Critically Endangered, once widespread shark-like ray. The species is now extinct or severely depleted in many former parts of its range and is protected in some other range states where populations persist. The likelihood of collecting substantial new biological information is now low. Here, we review all available life history infor- mation on size, age and growth, reproductive biology, and demography as a resource for popula- tion assessment and demographic modelling. We also revisit a subset of historical data from the 1970s to examine the maternal size−litter size relationship. All available information on life history is derived from the Indo-West Pacific (i.e. northern Australia) and the Western Atlantic (i.e. Lake Nicaragua-Río San Juan system in Central America) subpopulations. P. pristis reaches a maxi- mum size of at least 705 cm total length (TL), size-at-birth is 72−90 cm TL, female size-at-maturity is reached by 300 cm TL, male size-at-maturity is 280−300 cm TL, age-at-maturity is 8−10 yr, longevity is 30−36 yr, litter size range is 1−20 (mean of 7.3 in Lake Nicaragua), and reproductive periodicity is suspected to be biennial in Lake Nicaragua (Western Atlantic) but annual in Aus- tralia (Indo-West Pacific). -
Mesozoic—Dinos!
MESOZOIC—DINOS! VOLUME 9, ISSUE 8, APRIL 2020 THIS MONTH DINOSAURS! • Dinosaurs ○ What is a Dinosaur? page 2 DINOSAURS! When people think paleontology, ○ Bird / Lizard Hip? page 5 they think of scientists ○ Size Activity 1 page 10 working in the hot sun of ○ Size Activity 2 page 13 Colorado National ○ Size Activity 3 page 43 Monument or the Badlands ○ Diet page 46 of South Dakota and ○ Trackways page 53 Wyoming finding enormous, ○ Colorado Fossils and fierce, and long-gone Dinosaurs page 66 dinosaurs. POWER WORDS Dinosaurs safely evoke • articulated: fossil terror. Better than any bones arranged in scary movie, these were Articulated skeleton of the Tyrannosaurus rex proper order actually living breathing • endothermic: an beasts! from the American Museum of Natural History organism produces body heat through What was the biggest dinosaur? be reviewing the information metabolism What was the smallest about dinosaurs, but there is an • metabolism: chemical dinosaur? What color were interview with him at the end of processes that occur they? Did they live in herds? this issue. Meeting him, you will within a living organism What can their skeletons tell us? know instantly that he loves his in order to maintain life What evidence is there so that job! It doesn’t matter if you we can understand more about become an electrician, auto CAREER CONNECTION how these animals lived. Are mechanic, dancer, computer • Meet Dr. Holtz, any still alive today? programmer, author, or Dinosaur paleontologist, I truly hope that Paleontologist! page 73 To help us really understand you have tremendous job more about dinosaurs, we have satisfaction, like Dr. -
Redalyc.Preliminary Report on a Late Cretaceous Vertebrate Fossil
Boletín de la Sociedad Geológica Mexicana ISSN: 1405-3322 [email protected] Sociedad Geológica Mexicana, A.C. México Rivera-Sylva, Héctor E.; Frey, Eberhard; Palomino-Sánchez, Francisco J.; Guzmán-Gutiérrez, José Rubén; Ortiz-Mendieta, Jorge A. Preliminary Report on a Late Cretaceous Vertebrate Fossil Assemblage in Northwestern Coahuila, Mexico Boletín de la Sociedad Geológica Mexicana, vol. 61, núm. 2, 2009, pp. 239-244 Sociedad Geológica Mexicana, A.C. Distrito Federal, México Available in: http://www.redalyc.org/articulo.oa?id=94316034014 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Preliminary Report on a Late Cretaceous Vertebrate Fossil Assemblage in Northwestern Coahuila, Mexico 239 BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA VOLUMEN 61, NÚM. 2, 2009, P. 239-244 D GEOL DA Ó E G I I C C O A S 1904 M 2004 . C EX . ICANA A C i e n A ñ o s Preliminary Report on a Late Cretaceous Vertebrate Fossil Assemblage in Northwestern Coahuila, Mexico Héctor E. Rivera-Sylva1, Eberhard Frey2, Francisco J. Palomino-Sánchez3, José Rubén Guzmán-Gutiérrez4, Jorge A. Ortiz-Mendieta5 1 Departamento de Paleontología, Museo del Desierto. Pról. Pérez Treviño 3745, 25015, Saltillo, Coah., México. 2 Geowissenschaftliche Abteilung,Staatliches Museum für Naturkunde Karlsruhe. Karlsruhe, Alemania. 3 Laboratorio de Petrografía y Paleontología, Instituto Nacional de Estadística, Geografía e Informática, Aguascalientes, Ags., México. 4 Centro para la Conservación del Patrimonio Natural y Cultural de México, Aguascalientes, Ags., México. -
Asteroid Impact, Not Volcanism, Caused the End-Cretaceous Dinosaur Extinction
Asteroid impact, not volcanism, caused the end-Cretaceous dinosaur extinction Alfio Alessandro Chiarenzaa,b,1,2, Alexander Farnsworthc,1, Philip D. Mannionb, Daniel J. Luntc, Paul J. Valdesc, Joanna V. Morgana, and Peter A. Allisona aDepartment of Earth Science and Engineering, Imperial College London, South Kensington, SW7 2AZ London, United Kingdom; bDepartment of Earth Sciences, University College London, WC1E 6BT London, United Kingdom; and cSchool of Geographical Sciences, University of Bristol, BS8 1TH Bristol, United Kingdom Edited by Nils Chr. Stenseth, University of Oslo, Oslo, Norway, and approved May 21, 2020 (received for review April 1, 2020) The Cretaceous/Paleogene mass extinction, 66 Ma, included the (17). However, the timing and size of each eruptive event are demise of non-avian dinosaurs. Intense debate has focused on the highly contentious in relation to the mass extinction event (8–10). relative roles of Deccan volcanism and the Chicxulub asteroid im- An asteroid, ∼10 km in diameter, impacted at Chicxulub, in pact as kill mechanisms for this event. Here, we combine fossil- the present-day Gulf of Mexico, 66 Ma (4, 18, 19), leaving a crater occurrence data with paleoclimate and habitat suitability models ∼180 to 200 km in diameter (Fig. 1A). This impactor struck car- to evaluate dinosaur habitability in the wake of various asteroid bonate and sulfate-rich sediments, leading to the ejection and impact and Deccan volcanism scenarios. Asteroid impact models global dispersal of large quantities of dust, ash, sulfur, and other generate a prolonged cold winter that suppresses potential global aerosols into the atmosphere (4, 18–20). These atmospheric dinosaur habitats. -
Chondrichthyan Fishes (Sharks, Skates, Rays) Announcements
Chondrichthyan Fishes (sharks, skates, rays) Announcements 1. Please review the syllabus for reading and lab information! 2. Please do the readings: for this week posted now. 3. Lab sections: 4. i) Dylan Wainwright, Thursday 2 - 4/5 pm ii) Kelsey Lucas, Friday 2 - 4/5 pm iii) Labs are in the Northwest Building basement (room B141) 4. Lab sections done: first lab this week on Thursday! 5. First lab reading: Agassiz fish story; lab will be a bit shorter 6. Office hours: we’ll set these later this week Please use the course web site: note the various modules Outline Lecture outline: -- Intro. to chondrichthyan phylogeny -- 6 key chondrichthyan defining traits (synapomorphies) -- 3 chondrichthyan behaviors -- Focus on several major groups and selected especially interesting ones 1) Holocephalans (chimaeras or ratfishes) 2) Elasmobranchii (sharks, skates, rays) 3) Batoids (skates, rays, and sawfish) 4) Sharks – several interesting groups Not remotely possible to discuss today all the interesting groups! Vertebrate tree – key ―fish‖ groups Today Chondrichthyan Fishes sharks Overview: 1. Mostly marine 2. ~ 1,200 species 518 species of sharks 650 species of rays 38 species of chimaeras Skates and rays 3. ~ 3 % of all ―fishes‖ 4. Internal skeleton made of cartilage 5. Three major groups 6. Tremendous diversity of behavior and structure and function Chimaeras Chondrichthyan Fishes: 6 key traits Synapomorphy 1: dentition; tooth replacement pattern • Teeth are not fused to jaws • New rows move up to replace old/lost teeth • Chondrichthyan teeth are -
The Origin and Early Evolution of Dinosaurs
Biol. Rev. (2010), 85, pp. 55–110. 55 doi:10.1111/j.1469-185X.2009.00094.x The origin and early evolution of dinosaurs Max C. Langer1∗,MartinD.Ezcurra2, Jonathas S. Bittencourt1 and Fernando E. Novas2,3 1Departamento de Biologia, FFCLRP, Universidade de S˜ao Paulo; Av. Bandeirantes 3900, Ribeir˜ao Preto-SP, Brazil 2Laboratorio de Anatomia Comparada y Evoluci´on de los Vertebrados, Museo Argentino de Ciencias Naturales ‘‘Bernardino Rivadavia’’, Avda. Angel Gallardo 470, Cdad. de Buenos Aires, Argentina 3CONICET (Consejo Nacional de Investigaciones Cient´ıficas y T´ecnicas); Avda. Rivadavia 1917 - Cdad. de Buenos Aires, Argentina (Received 28 November 2008; revised 09 July 2009; accepted 14 July 2009) ABSTRACT The oldest unequivocal records of Dinosauria were unearthed from Late Triassic rocks (approximately 230 Ma) accumulated over extensional rift basins in southwestern Pangea. The better known of these are Herrerasaurus ischigualastensis, Pisanosaurus mertii, Eoraptor lunensis,andPanphagia protos from the Ischigualasto Formation, Argentina, and Staurikosaurus pricei and Saturnalia tupiniquim from the Santa Maria Formation, Brazil. No uncontroversial dinosaur body fossils are known from older strata, but the Middle Triassic origin of the lineage may be inferred from both the footprint record and its sister-group relation to Ladinian basal dinosauromorphs. These include the typical Marasuchus lilloensis, more basal forms such as Lagerpeton and Dromomeron, as well as silesaurids: a possibly monophyletic group composed of Mid-Late Triassic forms that may represent immediate sister taxa to dinosaurs. The first phylogenetic definition to fit the current understanding of Dinosauria as a node-based taxon solely composed of mutually exclusive Saurischia and Ornithischia was given as ‘‘all descendants of the most recent common ancestor of birds and Triceratops’’. -
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. -
The Cenozoic Era - Nýlífsöld 65 MY-Present Jarðsaga 2 Ólafur Ingólfsson Origin of the Term: the Tertiary Tertiary System
The Cenozoic Era - Nýlífsöld 65 MY-Present Jarðsaga 2 Ólafur Ingólfsson Origin of the Term: The Tertiary Tertiary System. [1760] Named by Giovanni Arduino Period as the uppermost part of his 65-1.8 MY three-fold subdivision of mountains in northern Italy. The Tertiary became a formal period and system when Lyell published his work describing further subdivisions of the Tertiary. The Tertiary Period is divided into five epochs (tímar): Paleocene (65-56 MY), Eocene (56-34 MY), Oligocene (34-24 MY), Miocene (24-5,3 MY), and Pliocene (5,3-1,8 MY). Confusing set of stratigraphic terms... More than 95% of the Cenozoic era belongs to the Tertiary period. During the 18th century the names Primary, Secondary, and Tertiary were given by Giovanni Arduino to successive rock strata, the Primary being the oldest, the Tertiary the more recent. In 1829 a fourth division, the Quaternary, was added by P. G. Desnoyers. These terms were later abandoned, the Primary becoming the Paleozoic Era, and the Secondary the Mesozoic. But Tertiary and Quaternary were retained for the two main stages of the Cenozoic. Attempts to replace the "Tertiary" with a more reasonable division of “Palaeogene” (early Tertiary) and “Neogene” (later Tertiary and Quaternary) have not been very successful. Stanley uses this division. The World at the K/T Boundary Paleocene plate tectonics During the Paleocene, the inland seas of the Cretaceous Period dry up, exposing large land areas in North America and Eurasia. Australia begins to separate from Antarctica, and Greenland splits from North America. A remnant Tethys Sea persists in the equatorial region. -
Surface Geology Wind/Bighorn River Basin Wyoming and Montana
WYOMING STATE GEOLOGICAL SURVEY Plate I Thomas A. Drean, State Geologist Wind/Bighorn Basin Plan II - Available Groundwater Determination Technical Memorandum Surface Geology - Wind/Bighorn River Basin SWEET GRASS R25E R5E R15E R30E R10E R20E MONTANA Mm PM Jsg T7S KJ !c Pp Jsg KJ water Qt Surface Geology Ti ! Red Lodge PM DO PM PM Ts Ts p^r PM N ^r DO KJ DO !c Wind/Bighorn River Basin Tts Mm water Mm Ti Ti ^r DO Kmt Ti LOCATION MAP p^r ^r ^r Qt WYOMING Wyoming and Montana Kf Qt Ti p^r !c p^r PM 0 100 250 Miles Tts ^r PM DO Ti Jsg MD Ts Ti MzPz Kmv !Pg Qt compiled DO DO Tts Ts Taw DO DO DO water Qt Kc PM ^r Twl Qt Ob O^ by ^r Mm DO !c MD MONTANA Thr Ti Kc Qr Klc p^r Kmv Kc : # Ts ^r : O^ Nikolaus Gribb, Brett Worman, # Ts # water : PM Taw # Kf : PM !cd : Ket Qb Taw Qu Twp Thr # Ki Twl 345 P$Ma : Thr O^ Qa KJg Tfu : Jsg ^r Qu : :: # Kl (! KJk : Qr Qls Tomas Gracias, and Scott Quillinan Qb : Thr Ts Taw # Tfu 37 PM Kft: : # :: T10S Qls # Thr : # ^r Kc (! Kft Kmt # :::::: p^r :: : Qu KJk Kc MD Taw DO Qu # p^r Qg :: Km KJ WYOMING Taw Ti : Kl 2012 Thr : Qb # # # Qg : water DO Qls ::: !c !Pg !cd MDO water water Kc Qa :::::: :: Kmt ::: : Twl 90 : Ti Ts Qu Qa Qg Kmv !Pcg Mm KJk : Qg : 212 : Qu Qg £¤ Kmv KJ ¨¦§ Tts Taw p^r ^r # Kl : Kf Kf 338 Ob !cd Qu Qu Ttp # (! : : : p^r ::: !Pg O^ MD P$Ma Thr : Qa # DO Km Qls 343 ^r Qls Taw : Qb Qg Qls Qa Km Jsg water (! : Qb # !cd ^r Kc BighornLake : MD # Taw Qa Qls Qt MD A′ MD MD Qg Twl !Pg Qu Qb Tii # Twp ^r water MzPz Qg Tfu Kl ::: Taw Taw Twp Qls : Qt Kmv Qa Ob P$Ma : Thr Qa # Tcr ^r water Qa Kft # Qt O^ -
Memorial to Carl Owen Dunbar 1891-1979 KARL M
Memorial to Carl Owen Dunbar 1891-1979 KARL M. WAAGE Peabody Museum, Yale University, P.O. Box 6666, New Haven, Connecticut 06511 Carl Owen Dunbar died suddenly at the age of 88 on April 7, 1979, while at the home of his son, just across the street from his own home in Dunedin, Florida. He is survived by his son, Carl Owen Dunbar, Jr.; his daughter, Mrs. Lora Louise Johnson of Atlanta, Geor gia; six grandchildren, and three great-grandchildren. His wife, Lora Beamer Dunbar, whom he married at Lawrence, Kansas, in September of 1914, predeceased him in December 1978. Carl was born January 1, 1891, to David and Emma Thomas Dunbar on their wheat ranch near Hal- lowell, Cherokee County, Kansas. The Dunbars were pioneer wheat farmers in Kansas Territory and among the first in that area to use powered farm machinery. From his early youth, Carl commonly ran the machines and, as he matured, served as foreman of the hired crews. Graduating from Cherokee County High School in 1909, he entered the University of Kansas the following Sep tember. Early in his undergraduate days a visiting uncle asked whether he would study any geology. “What’s geology? I never heard of it,” replied Carl. The uncle confessed that he didn’t know much about it himself, but he had a friend who was a geologist, and he thought it was great. According to Carl, “Three days later, I was enrolled in a geology course, and the instructor was W. H. Twenhofel.” Recruitment through the inspiration and encouragement of one interested individual is a familiar pattern in our profession. -
Crustacea: Thalassinidea, Brachyura) from Puerto Rico, United States Territory
Bulletin of the Mizunami Fossil Museum, no. 34 (2008), p. 1–15, 6 figs., 1 table. © 2008, Mizunami Fossil Museum New Cretaceous and Cenozoic Decapoda (Crustacea: Thalassinidea, Brachyura) from Puerto Rico, United States Territory Carrie E. Schweitzer1, Jorge Velez-Juarbe2, Michael Martinez3, Angela Collmar Hull1, 4, Rodney M. Feldmann4, and Hernan Santos2 1)Department of Geology, Kent State University Stark Campus, 6000 Frank Ave. NW, North Canton, Ohio, 44720, USA <[email protected]> 2)Department of Geology, University of Puerto Rico, Mayagüez Campus, P. O. Box 9017, Mayagüez, Puerto Rico, 00681 United States Territory <[email protected]> 3)College of Marine Science, University of South Florida, 140 7th Ave. South, St. Petersburg, Florida 33701, USA <[email protected]> 4)Department of Geology, Kent State University, Kent, Ohio 44242, USA <[email protected]> Abstract A large number of recently collected specimens from Puerto Rico has yielded two new species including Palaeoxanthopsis tylotus and Eurytium granulosum, the oldest known occurrence of the latter genus. Cretaceous decapods are reported from Puerto Rico for the first time, and the Cretaceous fauna is similar to that of southern Mexico. Herein is included the first report of Pleistocene decapods from Puerto Rico, which were previously known from other Caribbean localities. The Pleistocene Cardisoma guanhumi is a freshwater crab of the family Gecarcinidae. The freshwater crab families have a poor fossil record; thus, the occurrence is noteworthy and may document dispersal of the crab by humans. Key words: Decapoda, Thalassinidea, Brachyura, Puerto Rico, Cretaceous, Paleogene, Neogene. Introduction than Eocene are not separated by these fault zones and even overlie parts of the fault zones in some areas (Jolly et al., 1998). -
Dinotracks.Indb 358 1/22/16 11:23 AM Dinosaur Tracks in Eolian Strata: New Insights Into Track Formation, Walking Kinetics and Trackmaker Behavior 18
358 DinoTracks.indb 358 1/22/16 11:23 AM Dinosaur Tracks in Eolian Strata: New Insights into Track Formation, Walking Kinetics and Trackmaker Behavior 18 David B. Loope and Jesper Milàn Dinosaur tracks are abundant in wind-blown hooves of the bison deformed soft, laminated sediment – the Mesozoic deposits, but the nature of loose eolian sand perfect medium to preserve recognizable tracks. The next makes it difficult to determine how they are preserved. This windstorm buried the tracks. Today, the thick cover of grasses also raises the questions: Why would dinosaurs be walking protects the land surface so well that there are no soft, lami- around in dune fields in the first place? And, if they did go nated sediments for cattle to step on. And, if any tracks were, there, why would their tracks not be erased by the next wind somehow, to get formed, no moving sediment would be avail- storm? able to bury them. Mesozoic eolian sediments around the world, which have been the focus of a number of case studies Introduction in recent years, preserve the tracks of dinosaurs that walked on actively migrating sand dunes. This chapter summarizes Most dunes today form only in deserts and along shore- the known occurrences of dinosaur tracks in Mesozoic eo- lines – the only sandy land surfaces that are nearly devoid of lian strata and discusses their unique modes of preservation plants. Normally plants slow the wind at the ground surface and the anatomical and behavioral information about the enough that sand will not move even when the plant cover trackmakers that can be deduced from them.