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BOA2.1 Caecilian Biology and Natural History.Key
The Biology of Amphibians @ Agnes Scott College Mark Mandica Executive Director The Amphibian Foundation [email protected] 678 379 TOAD (8623) 2.1: Introduction to Caecilians Microcaecilia dermatophaga Synapomorphies of Lissamphibia There are more than 20 synapomorphies (shared characters) uniting the group Lissamphibia Synapomorphies of Lissamphibia Integumen is Glandular Synapomorphies of Lissamphibia Glandular Skin, with 2 main types of glands. Mucous Glands Aid in cutaneous respiration, reproduction, thermoregulation and defense. Granular Glands Secrete toxic and/or noxious compounds and aid in defense Synapomorphies of Lissamphibia Pedicellate Teeth crown (dentine, with enamel covering) gum line suture (fibrous connective tissue, where tooth can break off) basal element (dentine) Synapomorphies of Lissamphibia Sacral Vertebrae Sacral Vertebrae Connects pelvic girdle to The spine. Amphibians have no more than one sacral vertebrae (caecilians have none) Synapomorphies of Lissamphibia Amphicoelus Vertebrae Synapomorphies of Lissamphibia Opercular apparatus Unique to amphibians and Operculum part of the sound conducting mechanism Synapomorphies of Lissamphibia Fat Bodies Surrounding Gonads Fat Bodies Insulate gonads Evolution of Amphibians † † † † Actinopterygian Coelacanth, Tetrapodomorpha †Amniota *Gerobatrachus (Ray-fin Fishes) Lungfish (stem-tetrapods) (Reptiles, Mammals)Lepospondyls † (’frogomander’) Eocaecilia GymnophionaKaraurus Caudata Triadobatrachus Anura (including Apoda Urodela Prosalirus †) Salientia Batrachia Lissamphibia -
Constraints on the Timescale of Animal Evolutionary History
Palaeontologia Electronica palaeo-electronica.org Constraints on the timescale of animal evolutionary history Michael J. Benton, Philip C.J. Donoghue, Robert J. Asher, Matt Friedman, Thomas J. Near, and Jakob Vinther ABSTRACT Dating the tree of life is a core endeavor in evolutionary biology. Rates of evolution are fundamental to nearly every evolutionary model and process. Rates need dates. There is much debate on the most appropriate and reasonable ways in which to date the tree of life, and recent work has highlighted some confusions and complexities that can be avoided. Whether phylogenetic trees are dated after they have been estab- lished, or as part of the process of tree finding, practitioners need to know which cali- brations to use. We emphasize the importance of identifying crown (not stem) fossils, levels of confidence in their attribution to the crown, current chronostratigraphic preci- sion, the primacy of the host geological formation and asymmetric confidence intervals. Here we present calibrations for 88 key nodes across the phylogeny of animals, rang- ing from the root of Metazoa to the last common ancestor of Homo sapiens. Close attention to detail is constantly required: for example, the classic bird-mammal date (base of crown Amniota) has often been given as 310-315 Ma; the 2014 international time scale indicates a minimum age of 318 Ma. Michael J. Benton. School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, U.K. [email protected] Philip C.J. Donoghue. School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, U.K. [email protected] Robert J. -
Early Tetrapod Relationships Revisited
Biol. Rev. (2003), 78, pp. 251–345. f Cambridge Philosophical Society 251 DOI: 10.1017/S1464793102006103 Printed in the United Kingdom Early tetrapod relationships revisited MARCELLO RUTA1*, MICHAEL I. COATES1 and DONALD L. J. QUICKE2 1 The Department of Organismal Biology and Anatomy, The University of Chicago, 1027 East 57th Street, Chicago, IL 60637-1508, USA ([email protected]; [email protected]) 2 Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire SL57PY, UK and Department of Entomology, The Natural History Museum, Cromwell Road, London SW75BD, UK ([email protected]) (Received 29 November 2001; revised 28 August 2002; accepted 2 September 2002) ABSTRACT In an attempt to investigate differences between the most widely discussed hypotheses of early tetrapod relation- ships, we assembled a new data matrix including 90 taxa coded for 319 cranial and postcranial characters. We have incorporated, where possible, original observations of numerous taxa spread throughout the major tetrapod clades. A stem-based (total-group) definition of Tetrapoda is preferred over apomorphy- and node-based (crown-group) definitions. This definition is operational, since it is based on a formal character analysis. A PAUP* search using a recently implemented version of the parsimony ratchet method yields 64 shortest trees. Differ- ences between these trees concern: (1) the internal relationships of aı¨stopods, the three selected species of which form a trichotomy; (2) the internal relationships of embolomeres, with Archeria -
The Braincase of Eocaecilia Micropodia (Lissamphibia, Gymnophiona) and the Origin of Caecilians
The Braincase of Eocaecilia micropodia (Lissamphibia, Gymnophiona) and the Origin of Caecilians Hillary C. Maddin1,2*, Farish A. Jenkins, Jr.1, Jason S. Anderson2 1 Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, United States of America, 2 Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, Alberta, Canada Abstract The scant fossil record of caecilians has obscured the origin and evolution of this lissamphibian group. Eocaecilia micropodia from the Lower Jurassic of North America remains the only stem-group caecilian with an almost complete skull preserved. However, this taxon has been controversial, engendering re-evaluation of traits considered to be plesiomorphic for extant caecilians. Both the validity of the placement of E. micropodia as a stem caecilian and estimates of the plesiomorphic condition of extant caecilians have been questioned. In order to address these issues, the braincase of E. micropodia was examined via micro-computed tomography. The braincase is considered to be a more reliable phylogenetic indicator than peripheral regions of the skull. These data reveal significant new information, including the possession of an ossified nasal septum, ossified anterior wall of the sphenethmoid, long anterolateral processes on the sphenethmoid, and paired olfactory nerve foramina, which are known only to occur in extant caecilians; the latter are possibly related to the evolution of the tentacle, a caecilian autapomorphy. A phylogenetic analysis that included 64 non-amniote taxa and 308 characters represents the first extensive test of the phylogenetic affinities of E. micropodia. The results place E. micropodia securely on the stem of extant caecilians, representing a clade within Temnospondyli that is the sister taxon to batrachians plus Gerobatrachus. -
Physical and Environmental Drivers of Paleozoic Tetrapod Dispersal Across Pangaea
ARTICLE https://doi.org/10.1038/s41467-018-07623-x OPEN Physical and environmental drivers of Paleozoic tetrapod dispersal across Pangaea Neil Brocklehurst1,2, Emma M. Dunne3, Daniel D. Cashmore3 &Jӧrg Frӧbisch2,4 The Carboniferous and Permian were crucial intervals in the establishment of terrestrial ecosystems, which occurred alongside substantial environmental and climate changes throughout the globe, as well as the final assembly of the supercontinent of Pangaea. The fl 1234567890():,; in uence of these changes on tetrapod biogeography is highly contentious, with some authors suggesting a cosmopolitan fauna resulting from a lack of barriers, and some iden- tifying provincialism. Here we carry out a detailed historical biogeographic analysis of late Paleozoic tetrapods to study the patterns of dispersal and vicariance. A likelihood-based approach to infer ancestral areas is combined with stochastic mapping to assess rates of vicariance and dispersal. Both the late Carboniferous and the end-Guadalupian are char- acterised by a decrease in dispersal and a vicariance peak in amniotes and amphibians. The first of these shifts is attributed to orogenic activity, the second to increasing climate heterogeneity. 1 Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK. 2 Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany. 3 School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK. 4 Institut -
(Temnospondyli), and the Evolution of Modern
THE LOWER PERMIAN DISSOROPHOID DOLESERPETON (TEMNOSPONDYLI), AND THE EVOLUTION OF MODERN AMPHIBIANS Trond Sigurdsen Department of Biology McGill University, Montreal November 2009 A thesis submitted to McGill University in partial fulfillment of the requirements of the degree of Doctor of Philosophy © Trond Sigurdsen 2009 1 ACKNOWLEDGMENTS I am deeply grateful to my supervisors Robert L. Carroll and David M. Green for their support, and for revising and correcting the drafts of the individual chapters. Without their guidance, encouragement, and enthusiasm this project would not have been possible. Hans Larsson has also provided invaluable help, comments, and suggestions. Special thanks go to John R. Bolt, who provided specimens and contributed to Chapters 1 and 3. I thank Farish Jenkins, Jason Anderson, and Eric Lombard for making additional specimens available. Robert Holmes, Jean-Claude Rage, and Zbyněk Roček have all provided helpful comments and observations. Finally, I would like to thank present and past members of the Paleolab at the Redpath Museum, Montreal, for helping out in various ways. Specifically, Thomas Alexander Dececchi, Nadia Fröbisch, Luke Harrison, Audrey Heppleston and Erin Maxwell have contributed helpful comments and technical insight. Funding was provided by NSERC, the Max Stern Recruitment Fellowship (McGill), the Delise Allison and Alma Mater student travel grants (McGill), and the Society of Vertebrate Paleontology Student Travel Grant. 2 CONTRIBUTIONS OF AUTHORS Chapters 1 and 3 were written in collaboration with Dr. John R. Bolt from the Field Museum of Chicago. The present author decided the general direction of these chapters, studied specimens, conducted the analyses, and wrote the final drafts. -
Maddin Etal 2012
The Braincase of Eocaecilia micropodia (Lissamphibia, Gymnophiona) and the Origin of Caecilians The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Maddin, Hillary Catherine, Farish A. Jenkins Jr., and Jason S. Anderson. 2012. The braincase of Eocaecilia micropodia (Lissamphibia, Gymnophiona) and the origin of caecilians. PLoS ONE 7(12): e50743. Published Version doi:10.1371/journal.pone.0050743 Citable link http://nrs.harvard.edu/urn-3:HUL.InstRepos:9969388 Terms of Use This article was downloaded from Harvard University’s DASH repository, and is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http:// nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of- use#OAP The Braincase of Eocaecilia micropodia (Lissamphibia, Gymnophiona) and the Origin of Caecilians Hillary C. Maddin1,2*, Farish A. Jenkins, Jr.1, Jason S. Anderson2 1 Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, United States of America, 2 Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, Alberta, Canada Abstract The scant fossil record of caecilians has obscured the origin and evolution of this lissamphibian group. Eocaecilia micropodia from the Lower Jurassic of North America remains the only stem-group caecilian with an almost complete skull preserved. However, this taxon has been controversial, engendering re-evaluation of traits considered to be plesiomorphic for extant caecilians. Both the validity of the placement of E. micropodia as a stem caecilian and estimates of the plesiomorphic condition of extant caecilians have been questioned. -
Of Modern Amphibians: a Commentary
The origin(s) of modern amphibians: a commentary. D. Marjanovic, Michel Laurin To cite this version: D. Marjanovic, Michel Laurin. The origin(s) of modern amphibians: a commentary.. Journal of Evolutionary Biology, Wiley, 2009, 36, pp.336-338. 10.1007/s11692-009-9065-8. hal-00549002 HAL Id: hal-00549002 https://hal.archives-ouvertes.fr/hal-00549002 Submitted on 7 May 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. The origin(s) of modern amphibians: a commentary By David Marjanović1 and Michel Laurin1* 1Address: UMR CNRS 7207 “Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements”, Muséum National d’Histoire Naturelle, Département Histoire de la Terre, Bâtiment de Géologie, case postale 48, 57 rue Cuvier, F-75231 Paris cedex 05, France *Corresponding author tel/fax. (+33 1) 44 27 36 92 E-mail: [email protected] Number of words: 1884 Number of words in text section only: 1378 2 Anderson (2008) recently reviewed the controversial topic of extant amphibian origins, on which three (groups of) hypotheses exist at the moment. Anderson favors the “polyphyly hypothesis” (PH), which considers the extant amphibians to be polyphyletic with respect to many Paleozoic limbed vertebrates and was most recently supported by the analysis of Anderson et al. -
A Triassic Stem-Salamander from Kyrgyzstan and the Origin of Salamanders
A Triassic stem-salamander from Kyrgyzstan and the origin of salamanders Rainer R. Schocha,1, Ralf Werneburgb, and Sebastian Voigtc aStaatliches Museum für Naturkunde in Stuttgart, D-70191 Stuttgart, Germany; bNaturhistorisches Museum Schloss Bertholdsburg, D-98553 Schleusingen, Germany; and cUrweltmuseum GEOSKOP/Burg Lichtenberg (Pfalz), D-66871 Thallichtenberg, Germany Edited by Neil H. Shubin, University of Chicago, Chicago, IL, and approved April 3, 2020 (received for review January 24, 2020) The origin of extant amphibians remains largely obscure, with Cretaceous in northwestern China, providing much data on the only a few early Mesozoic stem taxa known, as opposed to a much early evolution and diversification of the clade. better fossil record from the mid-Jurassic on. In recent time, an- Recently, a German team excavating in the Kyrgyz Madygen urans have been traced back to Early Triassic forms and caecilians Formation (16) recovered a second find of Triassurus that is not have been traced back to the Late Jurassic Eocaecilia, both of only larger and better preserved, but also adds significantly more which exemplify the stepwise acquisition of apomorphies. Yet data on this taxon. Reexamination of the type has revealed the most ancient stem-salamanders, known from mid-Jurassic shared apomorphic features between the two Madygen speci- rocks, shed little light on the origin of the clade. The gap between mens, some of which turned out to be stem-salamander (uro- salamanders and other lissamphibians, as well as Paleozoic tetra- pods, remains considerable. Here we report a new specimen of dele) autapomorphies. The present findings demonstrate not Triassurus sixtelae, a hitherto enigmatic tetrapod from the Middle/ only that Triassurus is a valid tetrapod taxon, but also, and more Late Triassic of Kyrgyzstan, which we identify as the geologically oldest importantly, that it forms a very basal stem-salamander, com- stem-group salamander. -
The Earliest Equatorial Record of Frogs from the Late Triassic of Arizona
Palaeontology The earliest equatorial record of frogs royalsocietypublishing.org/journal/rsbl from the Late Triassic of Arizona Michelle R. Stocker1, Sterling J. Nesbitt1, Ben T. Kligman1,2, Daniel J. Paluh3, Adam D. Marsh2, David C. Blackburn3 and William G. Parker2 Research 1Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, USA 2 Cite this article: Stocker MR, Nesbitt SJ, Petrified Forest National Park, 1 Park Road, Petrified Forest, AZ 86028, USA 3Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA Kligman BT, Paluh DJ, Marsh AD, Blackburn DC, Parker WG. 2019 The earliest equatorial record MRS, 0000-0002-6473-8691; SJN, 0000-0002-7017-1652; BTK, 0000-0003-4400-8963; DJP, 0000-0003-3506-2669; ADM, 0000-0002-3223-8940; DCB, 0000-0002-1810-9886; of frogs from the Late Triassic of Arizona. Biol. WGP, 0000-0002-6005-7098 Lett. 15: 20180922. http://dx.doi.org/10.1098/rsbl.2018.0922 Crown-group frogs (Anura) originated over 200 Ma according to molecular phylogenetic analyses, though only a few fossils from high latitudes chronicle the first approximately 60 Myr of frog evolution and distribution. We report fos- sils that represent both the first Late Triassic and the earliest equatorial record of Received: 29 December 2018 Salientia, the group that includes stem and crown-frogs. These small fossils con- Accepted: 1 February 2019 sist of complete and partial ilia with anteriorly directed, elongate and distally hollow iliac blades. These features of these ilia, including the lack of a prominent dorsal protuberance and a shaft that is much longer than the acetabular region, suggest a closer affinity to crown-group Anura than to Early Triassic stem anur- ans Triadobatrachus from Madagascar and Czatkobatrachus from Poland, both Subject Areas: high-latitude records. -
For Peer Review 2.3.2
Earth and Environmental Science Transactions of the Royal Society of Edinburgh The evolution of the tetrapod humerus: morphometrics, disparity, and evolutionary rates Earth and Environmental Science Transactions of the Royal Society of Journal: Edinburgh Manuscript ID TRE-2018-0013.R1 Manuscript Type: Early Vertebrate Evolution Date Submitted by the Author: 25-Jul-2018 Complete List of Authors: Ruta, Marcello; University of Lincoln, School of Life Sciences Krieger, Jonathan; Home address, 11A Wynford Road ForAngielczyk, Peer Kenneth; Review Field Museum of Natural History, Earth Sciences, Integrative Research Centre Wills, Matthew; University of Bath, The Milner Centre for Evolution, Department of Biology and Biochemistry amniotes, eigenshape analysis, evolutionary rate shifts, humeral Keywords: morphology, lepospondyls, lissamphibians, tetrapodomorphs Cambridge University Press Page 1 of 53 Earth and Environmental Science Transactions of the Royal Society of Edinburgh 1 The evolution of the tetrapod humerus: morphometrics, disparity, and evolutionary rates Marcello Ruta1,*, Jonathan Krieger2, Kenneth D. Angielczyk3 and Matthew A. Wills4 1 School of Life Sciences,For University Peer of Lincoln, Review Lincoln LN6 7DL, UK 2 11A Wynford Road, Poole BH14 8PG, UK 3 Earth Sciences, Integrative Research Center, Field Museum of Natural History, Chicago, Illinois 60605-2496, USA 4 The Milner Centre for Evolution, Department of Biology and Biochemistry, The University of Bath, Bath BA2 7AY, UK * Corresponding author Cambridge University Press Earth and Environmental Science Transactions of the Royal Society of Edinburgh Page 2 of 53 2 ABSTRACT: The present study explores the macroevolutionary dynamics of shape changes in the humeri of all major grades and clades of early tetrapods and their fish-like forerunners. -
Tetrapod Biostratigraphy and Biochronology Across the Triassic-Jurassic Boundary in Northeastern Arizona
Heckert, A.B., and Lucas, S.G., eds., 2005, Vertebrate Paleontology in Arizona. New Mexico Museum of Natural History and Science Bulletin No. 29. 84 TETRAPOD BIOSTRATIGRAPHY AND BIOCHRONOLOGY ACROSS THE TRIASSIC-JURASSIC BOUNDARY IN NORTHEASTERN ARIZONA SPENCER G. LUCAS1, LAWRENCE H. TANNER2 and ANDREW B. HECKERT3 1New Mexico Museum of Natural History, 1801 Mountain Rd. N.W., Albuquerque, NM 87104-1375; 2Department of Biology, Le Moyne College, 1419 Salt Springs Road, Syracuse, NY, 13214; 3Department of Geology, Appalachian State University, ASU Box 32067, Boone, NC, 28608-2067 Abstract—Nonmarine fluvial, eolian and lacustrine strata of the Chinle and Glen Canyon groups in northeastern Arizona and adjacent areas preserve tetrapod body fossils and footprints that are one of the world’s most extensive tetrapod fossil records across the Triassic-Jurassic boundary. We organize these tetrapod fossils into five, time-successive biostratigraphic assemblages (in ascending order, Owl Rock, Rock Point, Dinosaur Canyon, Whitmore Point and Kayenta) that we assign to the (ascending order) Revueltian, Apachean, Wassonian and Dawan land-vertebrate faunachrons (LVF). In doing so, we redefine the Wassonian and the Dawan LVFs. The Apachean-Wassonian boundary approximates the Triassic-Jurassic boundary. This tetrapod biostratigraphy and biochronology of the Triassic-Jurassic transition on the southern Colorado Plateau confirms that non-crocodilian crurotarsan extinction closely corresponds to the end of the Triassic, and that a dramatic increase in dinosaur diversity, abundance and body size preceded the end of the Triassic. Keywords: Triassic, Jurassic, vertebrate, biostratigraphy, Arizona, Glen Canyon Gp, Moenave Fm INTRODUCTION 114o Gateway Lisbon Valley The Four Corners (common boundary of Utah, Colorado, UTAH 50 km COLORADO Arizona and New Mexico) sit in the southern portion of the Colo- rado Plateau (Fig.