DOCSLIB.ORG

(Polyphysacea, Dasycladales, Chlorophyta), Mid

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
(Polyphysacea, Dasycladales, Chlorophyta), Mid Geologica Acta: an international earth science journal ISSN: 1695-6133 [email protected] Universitat de Barcelona España Granier, B.; Dias Brito, D.; Bucur, I. I. Clypeina tibanai, sp. nov. (Polyphysacea, Dasycladales, Chlorophyta), mid-Cretaceous green alga from the Potiguar Basin, Brazilian margin of the young South Atlantic Ocean Geologica Acta: an international earth science journal, vol. 12, núm. 3, julio-septiembre, 2014, pp. 227- 237 Universitat de Barcelona Barcelona, España Available in: http://www.redalyc.org/articulo.oa?id=50531655005 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 Geologica Acta, Vol.12, Nº 3, September 2014, 227-237 DOI: 10.1344/GeologicaActa2014.12.3.5 Clypeina tibanai, sp. nov. (Polyphysacea, Dasycladales, Chlorophyta), mid-Cretaceous green alga from the Potiguar Basin, Brazilian margin of the young South Atlantic Ocean B. GRANIER1 D. DIAS-BRITO2 I.I. BUCUR3 1Department of Ecology and Evolutionary Biology, The University of Kansas 1200 Sunnyside Avenue, Lawrence, Kansas 66045 (USA). E-mail: [email protected] 2UNESP - Universidade Estadual Paulista, Center for Geosciences Applied to Petroleum (UNESPetro) and Departamento de Geologia Caixa Postal 178, Av. 24 A, n º 1515, Bela Vista, CEP13506-900 - Rio Claro -SP (Brazil) 3Babeş-Bolyai University, Department of Geology and Center for Integrated Geological Studies Str. M. Kogalniceanu nr.1, 400084 Cluj-Napoca (Romania) ABS TRACT The fossil genus Clypeina (Michelin, 1845) comprises some 40 species. We describe Clypeina tibanai, a new spe- cies from ? upper Albian–Cenomanian strata of the Potiguar Basin, Brazil, characterised by closely set verticils of tubular, bended laterals. It is compared with Clypeina hanabataensis Yabe & Toyama, 1949, a Late Jurassic species, and with Pseudoactinoporella fragilis (Conrad, 1970), an Early Cretaceous taxon. The new species be- longs to a short list of green algae found in the young South Atlantic oceanic corridor, an assemblage defining a phycological paleobioprovince discrete from that of the Tethyan realm. KEYWORDS Dasycladales. Polyphysaceae. Clypeina. Cladosporate. Cretaceous. Albian. Cenomanian. INTRODUCTION as a coral-like animal by Michelin (1840-1847; p. 177-178, pl. 46, fig. 26 a-b). The generic name was given after the Many Dasycladalean genera are monospecific or comprise Latin word “clypeus”, meaning shield, because the first few species. By contrast, Clypeina (Michelin, 1845) looks like specimens collected by Michelin looked like “perfect rings” it had a relatively stable and successful history with more than and “half rings”. These individual calcareous structures forty species (see Appendix I) found over almost 200My, from were easily picked from the loose Cenozoic calcareous the Late Triassic up to the Palaeogene times. However moving sands of the Paris Basin. In contrast, our specimens are from simple counting of the morphospecies and going to the embedded in a hard limestone and studying them requires morphogroup reveal it was probably more heterogeneous than petrographic thin sections, roughly 30µm thick. previously thought. This new taxon is part of the earliest benthic assemblages, poorly diversified, colonizing the shallow-water In the second half of the 19th Century, there was no marine carbonate ramps of the young South Atlantic Ocean. consensus regarding the systematic position of these isolated “whorls”. They were re-assigned to foraminifera as A summary review of genus Clypeina (Michelin, 1845) “Dactylopora cylindracea var. marginiporella” by Parker and Jones (1860; p. 473-474), as “Dactylopora clypeina” The type species of Clypeina, the fossil Clypeina by Carpenter (1862; p. 130-131, fig. XXVIII.A–B), or as marginiporella (Michelin, 1845), was originally described “Haploporella marginiporella” by Gümbel (1872; p. 262- 227 B. Granier e t a l . Clypeina tibanai, a fossil green alga from Brazil 263, pl. IV, fig. 6.a–b) before they were correctly ascribed al., 1978). The last one by the “French Group Studying to the algae, i.e. to the “Siphonées verticillées”, by Munier- Fossil Algae” (Bassoullet et al., 1978) takes into account Chalmas (1877). Later, L. and J. Morellet (1913; p. 34, the observation of J. and L. Morellet (1918) who found pl. III, figs. 20-25) included them in the “Acétabulariées”. pores on the cap (top) of the algal thallus corresponding They illustrated funnels (“entonnoirs”) and discs that were to the mark of a terminal tuft of sterile “hairs”. It also thought to represent terminal caps as in the living thalli incorporates an opinion since J. and L. Morellet (1918; of Acetabularia (see photomicrographs in Berger, 2006). p. 104, § “4°”) report the occurrence of tubes with rows The fossil remains consisting of several superposed and of pores, i.e. verticils of sterile laterals. Such features are imbricated umbels led L. and J. Morellet (1918) to revise observed in some modern Acetabularia (see for instance, this assumption and to provide a modern and synthetic Granier, 1994; pl. 4, figs. 6-9). According to them, these view of the generic concept, which was not formalized tubes should represent the bottom parts of some Clypeina until Bassoullet et al. (1978) sixty years later. thalli. However neither were they part of the material they studied, which is now deposited at the Muséum In their early contribution, L. and J. Morellet (1918) National d’Histoire Naturelle in Paris, nor were they introduced a new species, Clypeina helvetica, adding it observed in newly collected material (P. Génot, personal to the two species already known from Cenozoic strata, communication to B.G., June 6, 2012). Finally, Bassoullet i.e. C. marginiporella (Michelin, 1845) and C. digitata et al. (1978) introduced a new feature, i.e. the possible (Parker & Jones, 1860). However, there was still no record occurrence of sterile verticils between fertile ones. This of a Mesozoic representative of the genus Clypeina until feature was observed in Clypeina sulcata (Alth, 1881), but the description of Clypeina jurassica Favre, 1927, from it does not exist in the type-species, i.e. C. marginiporella uppermost Jurassic Purbeckian strata (Favre and Richard, (Michelin, 1845). In our opinion, other key features, such 1927; p. 34-35, figs. 10-11, pl. I, figs. 2-3), which was as the presence or absence of large interverticilar spacings, originally studied from thin sections and which later should also be taken into consideration. However the proved to be a junior synonym of Actinoporella sulcata revision of the whole group is beyond the aim of this study Alth, 1882. It is worth mentioning that Clypeina sulcata that focuses on the sole description of a new species found (Alth, 1882) is part of a small group of Dasycladales the in ? upper Albian–Cenomanian strata of Brazil. calcification of which is calcitic and mostly intracellular, instead of aragonitic and extracellular as in most other species (Granier, 2012). GEOLOGICAL INFORMATION Deloffre and Génot (1982) listed eleven Cenozoic Locality Clypeina species while ten years later Deloffre and Granier (1992) reported twelve. The catalogue of Jurassic and Petrobras Well 1-RNS-11 (Fig. 1), 30km North of Cretaceous algae published by Bassoullet et al. (1978) Macau, State of Rio Grande do Norte, SAD 69 (Brazil): included nine species while Granier and Deloffre (1992) UTM 24S 776981.92E 9461584.57N as indicated by reported twenty-one for the same time interval. To complete the Banco de Dados de Exploração e Produção (BDEP) the record there is also one Triassic representative: Clypeina of the Agência Nacional do Petróleo (ANP) (latitude besici Pantić in Granier & Deloffre, 1993, non 1965, and 4°51’59.198”S, longitude 36°30’9.655”W; see Google a number of recently described species: C. parasolkani Maps: -4.866444, -36.502682). Farinacci & Radoičić, 1991, C. bavarica Schlagintweit & Ebli, 1997, C. dragastani Dieni & Radoičić, 1999, Stratigraphic level C. dusanbrstinai Radoičić, 1997, C. isabellae Masse et al., 1999, C. bucuri Barattolo & Romano, 2002, C. Uppermost part of the Ponta do Mel Formation, ? late lucana Barattolo & Romano, 2002, C. ummshaifensis Albian–Cenomanian in age (Tibana and Terra, 1981; Granier Granier, 2002, C. loferensis Schlagintweit et al., 2009, et al., 2008). Ponta do Mel is a facies-driven lithostratigraphic and C. ? teakolarae Radoičić et al., 2011, transferred to unit represented by a dominantly calcareous interval Falsolikanella by Sokač et al. (2012). Finally, there are also sandwiched in the dominantly siliciclastic Açu Formation some new additions due to revision and subsequent new (Neto et al., 2007); locally, the upper siliciclastics are combinations: for instance, Heteroporella paucicalcarea missing and replaced by the pelagic facies of the Jandaíra Conrad, 1970 was re-ascribed to the genus Clypeina Formation (see Granier et al., 2008; Fig. 1). (Granier, 2013). To date there are forty valid species (see appendix for detailed listing). Facies and assemblage There were many revisions of the generic diagnosis The microfacies (Fig. 2A) displays a grain-dominated of Clypeina (see Rezak, 1957; Elliott, 1968; Bassoullet et fabric, commonly bioturbated: it is a floatstone of large Geologica Acta, 12(3), 226-237 (2014) 228 DOI: 10.1344/GeologicaActa2014.12.3.5 B. Granier e t a l . Clypeina tibanai, a fossil green alga from Brazil 4º40’S SOUTH ATLANTIC 1-RNS-11 5ºS Porto do Mangue Macau Guamaré 0 10 Km 37º W 36º40’W 36º20’W FIGURE 1. Location of the Petrobras well 1-RNS-11, 30km North of Macau, offshore of the State of Rio Grande do Norte (Brazil). aggregates and solenoporacean nodules with a poorly Material studied. The material studied is housed at sorted grainstone matrix. The smaller grains are pelletoids the Université de Bretagne Occidentale, Brest (France), and micritic ooids. There are few bioclasts, partly micritized Laboratoire de Paléontologie, catalogue number LPB and commonly microbially coated: echinoderms, small 27381–27395.
Load more

Recommended publications
  • Plant Life Magill’S Encyclopedia of Science
    MAGILLS ENCYCLOPEDIA OF SCIENCE PLANT LIFE MAGILLS ENCYCLOPEDIA OF SCIENCE PLANT LIFE Volume 4 Sustainable Forestry–Zygomycetes Indexes Editor Bryan D. Ness, Ph.D. Pacific Union College, Department of Biology Project Editor Christina J. Moose Salem Press, Inc. Pasadena, California Hackensack, New Jersey Editor in Chief: Dawn P. Dawson Managing Editor: Christina J. Moose Photograph Editor: Philip Bader Manuscript Editor: Elizabeth Ferry Slocum Production Editor: Joyce I. Buchea Assistant Editor: Andrea E. Miller Page Design and Graphics: James Hutson Research Supervisor: Jeffry Jensen Layout: William Zimmerman Acquisitions Editor: Mark Rehn Illustrator: Kimberly L. Dawson Kurnizki Copyright © 2003, by Salem Press, Inc. All rights in this book are reserved. No part of this work may be used or reproduced in any manner what- soever or transmitted in any form or by any means, electronic or mechanical, including photocopy,recording, or any information storage and retrieval system, without written permission from the copyright owner except in the case of brief quotations embodied in critical articles and reviews. For information address the publisher, Salem Press, Inc., P.O. Box 50062, Pasadena, California 91115. Some of the updated and revised essays in this work originally appeared in Magill’s Survey of Science: Life Science (1991), Magill’s Survey of Science: Life Science, Supplement (1998), Natural Resources (1998), Encyclopedia of Genetics (1999), Encyclopedia of Environmental Issues (2000), World Geography (2001), and Earth Science (2001). ∞ The paper used in these volumes conforms to the American National Standard for Permanence of Paper for Printed Library Materials, Z39.48-1992 (R1997). Library of Congress Cataloging-in-Publication Data Magill’s encyclopedia of science : plant life / edited by Bryan D.
    [Show full text]
  • Fossil Flora and Fauna of Bosnia and Herzegovina D Ela
    FOSSIL FLORA AND FAUNA OF BOSNIA AND HERZEGOVINA D ELA Odjeljenje tehničkih nauka Knjiga 10/1 FOSILNA FLORA I FAUNA BOSNE I HERCEGOVINE Ivan Soklić DOI: 10.5644/D2019.89 MONOGRAPHS VOLUME LXXXIX Department of Technical Sciences Volume 10/1 FOSSIL FLORA AND FAUNA OF BOSNIA AND HERZEGOVINA Ivan Soklić Ivan Soklić – Fossil Flora and Fauna of Bosnia and Herzegovina Original title: Fosilna flora i fauna Bosne i Hercegovine, Sarajevo, Akademija nauka i umjetnosti Bosne i Hercegovine, 2001. Publisher Academy of Sciences and Arts of Bosnia and Herzegovina For the Publisher Academician Miloš Trifković Reviewers Dragoljub B. Đorđević Ivan Markešić Editor Enver Mandžić Translation Amra Gadžo Proofreading Amra Gadžo Correction Sabina Vejzagić DTP Zoran Buletić Print Dobra knjiga Sarajevo Circulation 200 Sarajevo 2019 CIP - Katalogizacija u publikaciji Nacionalna i univerzitetska biblioteka Bosne i Hercegovine, Sarajevo 57.07(497.6) SOKLIĆ, Ivan Fossil flora and fauna of Bosnia and Herzegovina / Ivan Soklić ; [translation Amra Gadžo]. - Sarajevo : Academy of Sciences and Arts of Bosnia and Herzegovina = Akademija nauka i umjetnosti Bosne i Hercegovine, 2019. - 861 str. : ilustr. ; 25 cm. - (Monographs / Academy of Sciences and Arts of Bosnia and Herzegovina ; vol. 89. Department of Technical Sciences ; vol. 10/1) Prijevod djela: Fosilna flora i fauna Bosne i Hercegovine. - Na spor. nasl. str.: Fosilna flora i fauna Bosne i Hercegovine. - Bibliografija: str. 711-740. - Registri. ISBN 9958-501-11-2 COBISS/BIH-ID 8839174 CONTENTS FOREWORD ...........................................................................................................
    [Show full text]
  • Neoproterozoic Origin and Multiple Transitions to Macroscopic Growth in Green Seaweeds
    bioRxiv preprint doi: https://doi.org/10.1101/668475; this version posted June 12, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Neoproterozoic origin and multiple transitions to macroscopic growth in green seaweeds Andrea Del Cortonaa,b,c,d,1, Christopher J. Jacksone, François Bucchinib,c, Michiel Van Belb,c, Sofie D’hondta, Pavel Škaloudf, Charles F. Delwicheg, Andrew H. Knollh, John A. Raveni,j,k, Heroen Verbruggene, Klaas Vandepoeleb,c,d,1,2, Olivier De Clercka,1,2 Frederik Leliaerta,l,1,2 aDepartment of Biology, Phycology Research Group, Ghent University, Krijgslaan 281, 9000 Ghent, Belgium bDepartment of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052 Zwijnaarde, Belgium cVIB Center for Plant Systems Biology, Technologiepark 71, 9052 Zwijnaarde, Belgium dBioinformatics Institute Ghent, Ghent University, Technologiepark 71, 9052 Zwijnaarde, Belgium eSchool of Biosciences, University of Melbourne, Melbourne, Victoria, Australia fDepartment of Botany, Faculty of Science, Charles University, Benátská 2, CZ-12800 Prague 2, Czech Republic gDepartment of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742, USA hDepartment of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, 02138, USA. iDivision of Plant Sciences, University of Dundee at the James Hutton Institute, Dundee, DD2 5DA, UK jSchool of Biological Sciences, University of Western Australia (M048), 35 Stirling Highway, WA 6009, Australia kClimate Change Cluster, University of Technology, Ultimo, NSW 2006, Australia lMeise Botanic Garden, Nieuwelaan 38, 1860 Meise, Belgium 1To whom correspondence may be addressed. Email [email protected], [email protected], [email protected] or [email protected].
    [Show full text]
  • Acetabularia Acetabulum
    Plant Cell Physiol. 48(1): 122–133 (2007) doi:10.1093/pcp/pcl053, available online at www.pcp.oxfordjournals.org ß The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: [email protected] Spectroscopic and Biochemical Analysis of Regions of the Cell Wall of the Unicellular ‘Mannan Weed’, Acetabularia acetabulum Erin K. Dunn 1, 5, Douglas A. Shoue 2, 5, Xuemei Huang 3, Raymond E. Kline 4, Alex L. MacKay 3, Nicholas C. Carpita 2, Iain E.P. Taylor 4 and Dina F. Mandoli 1,Ã 1 Department of Biology, Center for Developmental Biology & Institute for Stem Cell and Regenerative Medicine, Box 35325, University of Washington, Seattle, WA 98195-5325, USA 2 Department of Botany and Plant Pathology, Purdue University, W. Lafayette, Indiana 47907-2054, USA 3 Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1 4 Department of Botany, University of British Columbia, Vancouver, BC, Canada V6T 1Z4 Downloaded from https://academic.oup.com/pcp/article/48/1/122/2469303 by guest on 29 September 2021 Although the Dasycladalean alga Acetabularia acetabulum Introduction has long been known to contain mannan-rich walls, it is not known to what extent wall composition varies as a function of The Mediterranean coralline alga Acetabularia the elaborate cellular differentiation of this cell, nor has it acetabulum (previously classified as A. mediterranea)isa been determined what other polysaccharides
    [Show full text]
  • "Phycology". In: Encyclopedia of Life Science
    Phycology Introductory article Ralph A Lewin, University of California, La Jolla, California, USA Article Contents Michael A Borowitzka, Murdoch University, Perth, Australia . General Features . Uses The study of algae is generally called ‘phycology’, from the Greek word phykos meaning . Noxious Algae ‘seaweed’. Just what algae are is difficult to define, because they belong to many different . Classification and unrelated classes including both prokaryotic and eukaryotic representatives. Broadly . Evolution speaking, the algae comprise all, mainly aquatic, plants that can use light energy to fix carbon from atmospheric CO2 and evolve oxygen, but which are not specialized land doi: 10.1038/npg.els.0004234 plants like mosses, ferns, coniferous trees and flowering plants. This is a negative definition, but it serves its purpose. General Features Algae range in size from microscopic unicells less than 1 mm several species are also of economic importance. Some in diameter to kelps as long as 60 m. They can be found in kinds are consumed as food by humans. These include almost all aqueous or moist habitats; in marine and fresh- the red alga Porphyra (also known as nori or laver), an water environments they are the main photosynthetic or- important ingredient of Japanese foods such as sushi. ganisms. They are also common in soils, salt lakes and hot Other algae commonly eaten in the Orient are the brown springs, and some can grow in snow and on rocks and the algae Laminaria and Undaria and the green algae Caulerpa bark of trees. Most algae normally require light, but some and Monostroma. The new science of molecular biology species can also grow in the dark if a suitable organic carbon has depended largely on the use of algal polysaccharides, source is available for nutrition.
    [Show full text]
  • Chlorophyta, Dasycladales) from the Pridolian to Middle Lochkovian Indian Point Formation, New Brunswick, Canada Steve T
    Document generated on 09/25/2021 8:42 a.m. Atlantic Geology Journal of the Atlantic Geoscience Society Revue de la Société Géoscientifique de l'Atlantique Medusaegraptus (Chlorophyta, Dasycladales) from the Pridolian to middle Lochkovian Indian Point Formation, New Brunswick, Canada Steve T. LoDuca, Randall F. Miller and Reginald A. Wilson Volume 49, 2013 Article abstract Carbonaceous compressions from the Pridolian to middle Lochkovian Indian URI: https://id.erudit.org/iderudit/1062310ar Point Formation in the Flatlands area of New Brunswick comprising a central DOI: https://doi.org/10.4138/atlgeol.2013.005 axis with irregularly arranged unbranched appendages are assigned to Medusaegraptusmirabilis. This is the first report of intact thalli of this See table of contents noncalcified macroalgal taxon from a locality outside of western New York. The biotic composition, stratigraphic context, and sedimentology of this occurrence suggest a shallow-marine depositional setting roughly comparable Publisher(s) to that for the type material of Medusaegraptus mirabilis from Gasport, New York.RÉSUMÉRÉSUMÉLes fossiles carbonés comprimés de la formation Atlantic Geoscience Society d’Indian Point, située dans la région de Flatlands du Nouveau-Brunswick et qui date du Pridolien au Lochkovien moyen, sont attribués àMedusaegraptus ISSN mirabilis; ils présentent un axe central avec des appendices non ramifiés et disposés de façon irrégulière. C’est la première fois qu’on signale la présence 0843-5561 (print) de thalles intacts de ce taxon de macroalgues non calcifiées dans une localité 1718-7885 (digital) ailleurs que dans l’ouest de l’État de New York. La composition biotique, le contexte stratigraphique et les données sédimentologiques permettent de Explore this journal penser à un dépôt marin peu profond à peu près comparable à ce qu’on trouve dans le cas de Medusaegraptus mirabilis de Gasport, dans l’État de New York.[Traduit par la redaction] Cite this article LoDuca, S., Miller, R.
    [Show full text]
  • Compartmentalization of Mrnas in the Giant, Unicellular Green Algae
    bioRxiv preprint doi: https://doi.org/10.1101/2020.09.18.303206; this version posted September 18, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Compartmentalization of mRNAs in the giant, 2 unicellular green algae Acetabularia acetabulum 3 4 Authors 5 Ina J. Andresen1, Russell J. S. Orr2, Kamran Shalchian-Tabrizi3, Jon Bråte1* 6 7 Address 8 1: Section for Genetics and Evolutionary Biology, Department of Biosciences, University of 9 Oslo, Kristine Bonnevies Hus, Blindernveien 31, 0316 Oslo, Norway. 10 2: Natural History Museum, University of Oslo, Oslo, Norway 11 3: Centre for Epigenetics, Development and Evolution, Department of Biosciences, University 12 of Oslo, Kristine Bonnevies Hus, Blindernveien 31, 0316 Oslo, Norway. 13 14 *Corresponding author 15 Jon Bråte, [email protected] 16 17 Keywords 18 Acetabularia acetabulum, Dasycladales, UMI, STL, compartmentalization, single-cell, mRNA. 19 20 Abstract 21 Acetabularia acetabulum is a single-celled green alga previously used as a model species for 22 studying the role of the nucleus in cell development and morphogenesis. The highly elongated 23 cell, which stretches several centimeters, harbors a single nucleus located in the basal end. 24 Although A. acetabulum historically has been an important model in cell biology, almost 25 nothing is known about its gene content, or how gene products are distributed in the cell. To 26 study the composition and distribution of mRNAs in A.
    [Show full text]
  • Dasycladales Morphogenesis: the Pattern Formation Viewpoint
    Dasycladales Morphogenesis: The Pattern Formation Viewpoint By Jacques Dumais B.Sc. (Biology) Universite de Sherbrooke, 1993 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER IN SCIENCE in THE FACULTY OF GRADUATE STUDIES DEPARTMENT OF BOTANY We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA April 1996 © Jacques Dumais, 1996 In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission. Department of l^OlXlrnu The University of British Columbia Vancouver, Canada Date Apl fl3^ , % DE-6 (2/88) Abstract The Dasycladalian algae produce diverse whorled structures, among which the best-known are the reproductive whorl (cap) and the vegetative whorls (hair whorls) of Acetabularia acetabulum. The origin of these structures is addressed in terms of three pattern forming mechanisms proposed to explain whorl formation. The mechanisms involve either: mechanical buckling of the cell wall, reaction-diffusion of morphogens along the cell membrane, or Ca2+-cytoskeleton mechano- chemical interactions in the cytosol. They are described and their idiosyncrasies underlined to provide a ground to test them experimentally. It is also suggested that the closely regulated spacing between the elements of a whorl is a key component of such a test.
    [Show full text]
  • Genera of the World: an Overview and Estimates Based on the March 2020 Release of the Interim Register of Marine and Nonmarine Genera (IRMNG)
    Megataxa 001 (2): 123–140 ISSN 2703-3082 (print edition) https://www.mapress.com/j/mt/ MEGATAXA Copyright © 2020 Magnolia Press Article ISSN 2703-3090 (online edition) https://doi.org/10.11646/megataxa.1.2.3 http://zoobank.org/urn:lsid:zoobank.org:pub:F4A52C97-BAD0-4FD5-839F-1A61EA40A7A3 All genera of the world: an overview and estimates based on the March 2020 release of the Interim Register of Marine and Nonmarine Genera (IRMNG) TONY REES 1, LEEN VANDEPITTE 2, 3, BART VANHOORNE 2, 4 & WIM DECOCK 2, 5 1 Private address, New South Wales, Australia. [email protected]; http://orcid.org/0000-0003-1887-5211 2 Flanders Marine Institute/Vlaams Instituut Voor De Zee (VLIZ), Wandelaarkaai 7, 8400 Ostend, Belgium. 3 [email protected]; http://orcid.org/0000-0002-8160-7941 4 [email protected]; https://orcid.org/0000-0002-6642-4725 5 [email protected]; https://orcid.org/0000-0002-2168-9471 Abstract Introduction We give estimated counts of known accepted genera of the The concept of a series of papers addressing portions of world (297,930±65,840, of which approximately 21% are the question of “all genera of the world” is a valuable one, fossil), of a total 492,620 genus names presently held for which can benefit from as much preliminary scoping as “all life”, based on the March 2020 release of the Interim may be currently available. To date, synoptic surveys of Register of Marine and Nonmarine Genera (IRMNG). A fur- biodiversity have been attempted mainly at the level of ther c.
    [Show full text]
  • Sea Lettuce Systematics: Lumping Or Splitting?
    bioRxiv preprint doi: https://doi.org/10.1101/413450; this version posted September 10, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Sea lettuce systematics: lumping or splitting? Manuela Bernardes Batista1‡, Regina L. Cunha 2‡, Rita Castilho2 and Paulo Antunes Horta3* 1Postgraduate Program in Ecology, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil 2Centre of Marine Sciences, CCMAR, Universidade do Algarve, Faro, Portugal. 3Phycology Laboratory, Department of Botany, Federal University of Santa Catarina, Florianópolis, SC 88040-900, Brazil ‡ These authors contributed equally to the work *Corresponding author: [email protected] 1 bioRxiv preprint doi: https://doi.org/10.1101/413450; this version posted September 10, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Abstract 2 Phylogenetic relationships within sea lettuce species belonging to the genus Ulva is a 3 daunting challenge given the scarcity of diagnostic morphological features and the pervasive 4 phenotypic plasticity. With more than 100 species described on a morphological basis, an 5 accurate evaluation of its diversity is still missing. Here we analysed 277 chloroplast-encoded 6 gene sequences (43 from this study), representing 35 nominal species of Ulva from the 7 Pacific, Indian Ocean, and Atlantic (with a particular emphasis on the Brazilian coast) in an 8 attempt to solve the complex phylogenetic relationships within this widespread genus.
    [Show full text]
  • Biodiversity and Community Structure of Seaweeds in Minahasa Peninsula, North Sulawesi, Indonesia Rene C
    Biodiversity and community structure of seaweeds in Minahasa Peninsula, North Sulawesi, Indonesia Rene C. Kepel, Lawrence J. L. Lumingas, John L. Tombokan, Desy M. H. Mantiri Faculty of Fisheries and Marine Science, Sam Ratulangi University, Manado, North Sulawesi, Indonesia. Corresponding author: R. C. Kepel, [email protected] Abstract. This study was conducted to determine the biodiversity and community structure (species composition, richness, diversity, evenness, dominance and clustering) of seaweeds found along the intertidal zone of Minahasa Peninsula, North Sulawesi Indonesia. The line transect method was used to identify and quantify the seaweeds abounding the three established stations divided into three transects each station, and each transect divided into ten quadrates. A total of 35 different species of seaweeds were identified in the study area belonging Rhodophyta (Rhodomelaceae, Lithophyllaceae, Mastoporaceae, Galaxauraceae, Gelidiaceae, Gracilariaceae, Solieriaceae, Cystocloniaceae), Phaeophyta (Dictyotaceae, Scytosiphonaceae, Sargassaceae) and Chlorophyta (Ulvaceae, Caulerpaceae, Halimedaceae, Dichotomosiphonaceae, Cladophoraceae, Anadyomenaceae, Siphonocladaceae, Valoniaceae, Dasycladaceae, Polyphysaceae). The most abundant seaweed species across the three stations were: Amphiroa fragilissima, Gracilaria edulis, and Bornetella sphaerica. The seaweed species identified also has different densities ranging from 0.03 to 23.77/m2. A. fragilissima had the highest density, and Hydroclathrus clathratus and had the lowest density. Species richness index, diversity index, evenness index and dominance index were calculated to determine diversity of seaweeds along the study area. Station 2 obtained the highest species richness and station 3 obtained the lowest species richness. On the other hand, station 2 recorded the highest diversity and station 1 recorded the lowest diversity. Evenness index was highest at station 2, while the lowest was at station 1.
    [Show full text]
  • A Multi-Locus Time-Calibrated Phylogeny of the Siphonous Green Algae
    Molecular Phylogenetics and Evolution 50 (2009) 642–653 Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev A multi-locus time-calibrated phylogeny of the siphonous green algae Heroen Verbruggen a,*, Matt Ashworth b, Steven T. LoDuca c, Caroline Vlaeminck a, Ellen Cocquyt a, Thomas Sauvage d, Frederick W. Zechman e, Diane S. Littler f, Mark M. Littler f, Frederik Leliaert a, Olivier De Clerck a a Phycology Research Group and Center for Molecular Phylogenetics and Evolution, Ghent University, Krijgslaan 281, Building S8, 9000 Ghent, Belgium b Section of Integrative Biology, University of Texas at Austin, 1 University Station MS A6700, Austin, TX 78712, USA c Department of Geography and Geology, Eastern Michigan University, Ypsilanti, MI 48197, USA d Botany Department, University of Hawaii at Manoa, 3190 Maile Way, Honolulu, HI 96822, USA e Department of Biology, California State University at Fresno, 2555 East San Ramon Avenue, Fresno, CA 93740, USA f Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA article info abstract Article history: The siphonous green algae are an assemblage of seaweeds that consist of a single giant cell. They com- Received 4 November 2008 prise two sister orders, the Bryopsidales and Dasycladales. We infer the phylogenetic relationships Revised 15 December 2008 among the siphonous green algae based on a five-locus data matrix and analyze temporal aspects of their Accepted 18 December 2008 diversification using relaxed molecular clock methods calibrated with the fossil record. The multi-locus Available online 25 December 2008 approach resolves much of the previous phylogenetic uncertainty, but the radiation of families belonging to the core Halimedineae remains unresolved.
    [Show full text]