DOCSLIB.ORG

Stratigraphic Paleobiology of Late Quaternary Mollusk Assemblages from the Po Plain-Adriatic Sea System

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Stratigraphic Paleobiology of Late Quaternary Mollusk Assemblages from the Po Plain-Adriatic Sea System Alma Mater Studiorum – Università di Bologna DOTTORATO DI RICERCA IN SCIENZE DELLA TERRA DELLA VITA E DELL’AMBIENTE Ciclo XXXI Settore concorsuale: 04/A2 Settore Scientifico disciplinare: GEO/01 Stratigraphic paleobiology of late Quaternary mollusk assemblages from the Po Plain-Adriatic Sea system Presentata da: Michele Azzarone Coordinatore Dottorato: Supervisore: Prof. Giulio Viola Dott.Daniele Scarponi Esame Finale anno 2019 Abstract Stratigraphic paleobiology - a relatively new approach for investigating fossiliferous sedimentary successions - is rooted on the assumption that the fossil record cannot be read at face value, being controlled not only by biotic, but also by sedimentary processes that control deposition and erosion of sediments. By applying the stratigraphic paleobiology tenets, this Ph.D. project focused on acquisition and analyses of macrofossils data to assess the response of late Quaternary ecosystems to environmental changes and enhance stratigraphic interpretations of fossiliferous successions. A primary activity of my Ph.D. research involved assembling a macrobenthic dataset from the latest Pleistocene glacial succession of the near-Mid Adriatic Deep (Central Adriatic, Italy). This dataset once combined with its counterpart from the Po coastal plain (Holocene), will offer a unique perspective on mollusk faunas and their dynamics during the current glacial-interglacial cycle. This thesis includes four papers. The first one assessed the quality and resolution of the macrofossil record from transgressive Holocene deposits of Po plain (Italy). The second paper focused on the Holocene fossil record of the Po coastal plain to evaluate the response of trematode parasites to high-frequency sea-level oscillations. The third study investigated distribution of last occurrences of macrobenthic species along a down-dip transect in the Po coastal plain and evaluate potential effects of sequence stratigraphic architecture on mass extinction pattern. The fourth is a case study to test the robustness of the paleoecological pattern derived by the application of different ordination analyses (DCA and nMDS) and to assess the main environmental driver(s) of faunal turnover in marine settings. In summary, my Ph.D. demonstrates that even if the fossil record cannot always be read literally, the stratigraphic paleobiology approach to the geologic record makes it possible to interpret biological trends from the fossil record and enhance the stratigraphic resolution of fossiliferous successions. Index 1. Introduction ........................................................................................................ 6 1.1. The Quaternary fossil record: an ideal laboratory for stratigraphic paleobiology................ 7 1.2. Mollusk fauna as a tool for stratigraphic paleobiology ......................................................... 8 1.3. The Milankovitch and sub-Milankovitch cyclicity ................................................................ 8 2. The Po Plain-Adriatic Sea system ........................................................................ 13 2.1. The Po Delta and its southern coastal plain ........................................................... 15 2.1.1. Tectonic setting ............................................................................................................ 16 2.1.2. Late Quaternary stratigraphic architecture .............................................................. 18 2.2. The Adriatic Sea and the Mid Adriatic Deep (MAD) ............................................. 25 2.2.1. Tectonic setting ............................................................................................................ 26 2.2.2. Late Quaternary stratigraphic architecture ..............................................................2 9 3. Research Outlines .............................................................................................. 34 4. The Mid Adriatic Deep (MAD) dataset ................................................................ 38 4.1. MAD data collection ............................................................................................................3 9 4.2. MAD dataset structure ........................................................................................................ 41 4.3. Future applications and outreach ....................................................................................... 44 5. Manuscript I ...................................................................................................... 46 “Systematic vertical and lateral changes in quality and time resolution of the macrofossil record: Insights from Holocene transgressive deposits, Po coastal plain, Italy” 6. Manuscript II ..................................................................................................... 60 “Surges in trematode prevalence linked to centennial-scale flooding events in the Adriatic” 7. Manuscript III .................................................................................................... 87 “Stratigraphic signatures of mass extinction: ecological and sedimentary determinants” 8. Manuscript IV ................................................................................................... 113 “Early-Middle Pleistocene benthic turnover and oxygen isotope stratigraphy from the Central Mediterranean (Valle di Manche, Crotone Basin, Italy): Data and trends” 9. Concluding remarks .......................................................................................... 129 References .............................................................................................................. 132 “It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes with various insect flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependant on each other in so complex manner, have all been produced by laws acting around us […]. There is a grandeur in this view of life, with several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms, most beautiful and most wonderful have been, and are being, evolved”. Charles Darwin On the Origin of Species Chapter 1 Introduction 6 1. Introduction Since the last few decades, a new approach for investigating fossiliferous sedimentary successions has gained approval throughout the paleontological scientific community. This recent development in the field of paleontology relies on the assumptions that the fossil record cannot be read at face value and that fossil dynamics through time and space are easier to interpret when analyzed in conjunction with their stratigraphic context (e.g., Kidwell, 1993; Holland, 1995, 2000; Scarponi and Kowalewski, 2004; Dominici and Kowalke, 2007; Patzkowsky and Holland, 2012; Terry and Novack, 2015; Danise and Holland, 2017). This relatively new paradigm to the investigation of the fossil record is known as stratigraphic paleobiology (Patzkowsky and Holland, 2012), which is rooted on the postulation that interpretation of the fossil record should also consider a modern understanding of the principles of sediment accumulation (Patzkowsky and Holland, 2012). Indeed, the distribution of fossil taxa in time and space is controlled not only by biotic processes (e.g., taxa niches, taxa evolutionary strategies, extinctions/originations) but also by physical processes that govern where and when fossiliferous sedimentary bodies are deposited and preserved. Teasing apart the effects of these two suites of processes on structuring fossil associations or at least acknowledgement of their conjunct effects, is pivotal for understand and reconstructing the dynamics of environments and their organisms through time. This is the core of stratigraphic paleobiology. Such an integrated approach is intended primarily to augment the potential of paleontological investigations to answer core questions that lays buried in the geological record of the Earth. A clear example on the assessment and magnitude of stratigraphic controls on fossil distribution is provided by Holland (1995). Here the author shows, by means of model data, that previously described paleobiologic patterns concerning mass extinction and evolutionary dynamics may be partly stratigraphic artifacts originating from the stratigraphic architecture of investigated successions. Specifically, the first and last occurrences (FOs and LOs, respectively) of marine fossil taxa cluster within intervals of strong time condensation or along sequence boundaries. This produces a distortion of the real time of appearance or extinction so that in the fossil record, such FOs and LOs will appear to be simultaneous even if they are not. Examples of such stratigraphic forcing on fossil records have been reported for decades (Patzkowsky and Holland, 1999; Holland, 2000; Kidwell and Holland, 2002; Scarponi and Kowalewski, 2007; Holland and Allen, 2008) and have reached full recognition in Patzkowsky and Holland (2012). The authors pointed out that the introduction of sequence stratigraphy concepts, which lead to a better understanding of sedimentary basin dynamics, will help to sort true biological signals from stratigraphic artifacts that shaped the fossil record. The last few years saw a growing wealth of case studies
Load more

Recommended publications
  • Seeking Criteria for Biodiversity Roofs Under Finnish Conditions
    SEEKING CRITERIA FOR BIODIVERSITY ROOFS UNDER FINNISH CONDITIONS WENFEI LIAO UNIVERSITY OF HELSINKI Department of Environmental Sciences Master’s Degree Programme in Environmental Ecology MASTER’S THESIS Octorber 2016 Tiedekunta/Osasto – Fakultet/Sektion – Faculty Laitos – Institution – Department Faculty of Biological and Environmental Sciences Department of Environmental Sciences Tekijä – Författare – Author Wenfei Liao Työn nimi – Arbetets titel – Title Seeking criteria for biodiversity roofs under Finnish conditions Oppiaine – Läroämne – Subject Social aspect of urban ecology Työn laji – Arbetets art – Level Aika – Datum – Month, year Sivumäärä – Sidoantal – Number of pages Master’s thesis October, 2016 76 + Appendices Tiivistelmä – Referat – Abstract Urbanisation has caused many environmental problems, such as air pollution and the loss of biodiversity. One way to mitigate these problems is to expand green spaces. Roofs, as the last frontier, could be made full use of. Green roofs have become a hot topic in recent years. In this study, I investigated the ability of green roofs to support urban biodiversity by conducting a literature review, and then I sought the criteria for biodiversity roofs under Finnish conditions by interviewing ecologists. My research questions in this study were 1) What kinds of habitats could be “ideal ecosystems” to be mimicked on biodiversity roofs in Finland; 2) which plant species could exist on roofs and whether they contribute to biodiversity; 3) what kinds of substrates support the biodiversity on roofs; 4) whether green roofs support faunal diversity and what faunal taxa could exist on roofs; 5) if and how roof structural characteristics influence roof biodiversity; 6) what kinds of management are practiced on biodiversity roofs; 7) what are people’s attitudes towards or perceptions of biodiversity roofs in general.
    [Show full text]
  • A Conservation Palaeobiological Approach to Assess Faunal Response of Threatened Biota Under Natural and Anthropogenic Environmental Change
    Biogeosciences, 16, 2423–2442, 2019 https://doi.org/10.5194/bg-16-2423-2019 © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change Sabrina van de Velde1,*, Elisabeth L. Jorissen2,*, Thomas A. Neubauer1,3, Silviu Radan4, Ana Bianca Pavel4, Marius Stoica5, Christiaan G. C. Van Baak6, Alberto Martínez Gándara7, Luis Popa7, Henko de Stigter8,2, Hemmo A. Abels9, Wout Krijgsman2, and Frank P. Wesselingh1 1Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, the Netherlands 2Palaeomagnetic Laboratory “Fort Hoofddijk”, Faculty of Geosciences, Utrecht University, Budapestlaan 17, 3584 CD Utrecht, the Netherlands 3Department of Animal Ecology & Systematics, Justus Liebig University, Heinrich-Buff-Ring 26–32 IFZ, 35392 Giessen, Germany 4National Institute of Marine Geology and Geoecology (GeoEcoMar), 23–25 Dimitrie Onciul St., 024053 Bucharest, Romania 5Department of Geology, Faculty of Geology and Geophysics, University of Bucharest, Balcescu˘ Bd. 1, 010041 Bucharest, Romania 6CASP, West Building, Madingley Rise, Madingley Road, CB3 0UD, Cambridge, UK 7Grigore Antipa National Museum of Natural History, Sos. Kiseleff Nr. 1, 011341 Bucharest, Romania 8NIOZ Royal Netherlands Institute for Sea Research, Department of Ocean Systems, 1790 AB Den Burg, the Netherlands 9Department of Geosciences and Engineering, Delft University of Technology, Stevinweg 1, 2628 CN Delft, the Netherlands *These authors contributed equally to this work. Correspondence: Sabrina van de Velde ([email protected]) and Elisabeth L. Jorissen ([email protected]) Received: 10 January 2019 – Discussion started: 31 January 2019 Revised: 26 April 2019 – Accepted: 16 May 2019 – Published: 17 June 2019 Abstract.
    [Show full text]
  • Laboratory Reference Module Summary Report LR22
    Laboratory Reference Module Summary Report Benthic Invertebrate Component - 2017/18 LR22 26 March 2018 Author: Tim Worsfold Reviewer: David Hall, NMBAQCS Project Manager Approved by: Myles O'Reilly, Contract Manager, SEPA Contact: [email protected] MODULE / EXERCISE DETAILS Module: Laboratory Reference (LR) Exercises: LR22 Data/Sample Request Circulated: 10th July 2017 Sample Submission Deadline: 31st August 2017 Number of Subscribing Laboratories: 7 Number of LR Received: 4 Contents Table 1. Summary of mis-identified taxa in the Laboratory Reference module (LR22) (erroneous identifications in brackets). Table 2. Summary of identification policy differences in the Laboratory Reference Module (LR22) (original identifications in brackets). Appendix. LR22 individual summary reports for participating laboratories. Table 1. Summary of mis-identified taxa in the Laboratory Reference Module (LR22) (erroneous identifications in brackets). Taxonomic Major Taxonomic Group LabCode Edits Polychaeta Oligochaeta Crustacea Mollusca Other Spio symphyta (Spio filicornis ) - Leucothoe procera (Leucothoe ?richardii ) - - Scolelepis bonnieri (Scolelepis squamata ) - - - - BI_2402 5 Laonice (Laonice sarsi ) - - - - Dipolydora (Dipolydora flava ) - - - - Goniada emerita (Goniadella bobrezkii ) - Nebalia reboredae (Nebalia bipes ) - - Polydora sp. A (Polydora cornuta ) - Diastylis rathkei (Diastylis cornuta ) - - BI_2403 7 Syllides? (Anoplosyllis edentula ) - Abludomelita obtusata (Tryphosa nana ) - in mixture - - Spirorbinae (Ditrupa arietina ) - - - -
    [Show full text]
  • WMSDB - Worldwide Mollusc Species Data Base
    WMSDB - Worldwide Mollusc Species Data Base Family: TURBINIDAE Author: Claudio Galli - [email protected] (updated 07/set/2015) Class: GASTROPODA --- Clade: VETIGASTROPODA-TROCHOIDEA ------ Family: TURBINIDAE Rafinesque, 1815 (Sea) - Alphabetic order - when first name is in bold the species has images Taxa=681, Genus=26, Subgenus=17, Species=203, Subspecies=23, Synonyms=411, Images=168 abyssorum , Bolma henica abyssorum M.M. Schepman, 1908 aculeata , Guildfordia aculeata S. Kosuge, 1979 aculeatus , Turbo aculeatus T. Allan, 1818 - syn of: Epitonium muricatum (A. Risso, 1826) acutangulus, Turbo acutangulus C. Linnaeus, 1758 acutus , Turbo acutus E. Donovan, 1804 - syn of: Turbonilla acuta (E. Donovan, 1804) aegyptius , Turbo aegyptius J.F. Gmelin, 1791 - syn of: Rubritrochus declivis (P. Forsskål in C. Niebuhr, 1775) aereus , Turbo aereus J. Adams, 1797 - syn of: Rissoa parva (E.M. Da Costa, 1778) aethiops , Turbo aethiops J.F. Gmelin, 1791 - syn of: Diloma aethiops (J.F. Gmelin, 1791) agonistes , Turbo agonistes W.H. Dall & W.H. Ochsner, 1928 - syn of: Turbo scitulus (W.H. Dall, 1919) albidus , Turbo albidus F. Kanmacher, 1798 - syn of: Graphis albida (F. Kanmacher, 1798) albocinctus , Turbo albocinctus J.H.F. Link, 1807 - syn of: Littorina saxatilis (A.G. Olivi, 1792) albofasciatus , Turbo albofasciatus L. Bozzetti, 1994 albofasciatus , Marmarostoma albofasciatus L. Bozzetti, 1994 - syn of: Turbo albofasciatus L. Bozzetti, 1994 albulus , Turbo albulus O. Fabricius, 1780 - syn of: Menestho albula (O. Fabricius, 1780) albus , Turbo albus J. Adams, 1797 - syn of: Rissoa parva (E.M. Da Costa, 1778) albus, Turbo albus T. Pennant, 1777 amabilis , Turbo amabilis H. Ozaki, 1954 - syn of: Bolma guttata (A. Adams, 1863) americanum , Lithopoma americanum (J.F.
    [Show full text]
  • Phylum MOLLUSCA
    285 MOLLUSCA: SOLENOGASTRES-POLYPLACOPHORA Phylum MOLLUSCA Class SOLENOGASTRES Family Lepidomeniidae NEMATOMENIA BANYULENSIS (Pruvot, 1891, p. 715, as Dondersia) Occasionally on Lafoea dumosa (R.A.T., S.P., E.J.A.): at 4 positions S.W. of Eddystone, 42-49 fm., on Lafoea dumosa (Crawshay, 1912, p. 368): Eddystone, 29 fm., 1920 (R.W.): 7, 3, 1 and 1 in 4 hauls N.E. of Eddystone, 1948 (V.F.) Breeding: gonads ripe in Aug. (R.A.T.) Family Neomeniidae NEOMENIA CARINATA Tullberg, 1875, p. 1 One specimen Rame-Eddystone Grounds, 29.12.49 (V.F.) Family Proneomeniidae PRONEOMENIA AGLAOPHENIAE Kovalevsky and Marion [Pruvot, 1891, p. 720] Common on Thecocarpus myriophyllum, generally coiled around the base of the stem of the hydroid (S.P., E.J.A.): at 4 positions S.W. of Eddystone, 43-49 fm. (Crawshay, 1912, p. 367): S. of Rame Head, 27 fm., 1920 (R.W.): N. of Eddystone, 29.3.33 (A.J.S.) Class POLYPLACOPHORA (=LORICATA) Family Lepidopleuridae LEPIDOPLEURUS ASELLUS (Gmelin) [Forbes and Hanley, 1849, II, p. 407, as Chiton; Matthews, 1953, p. 246] Abundant, 15-30 fm., especially on muddy gravel (S.P.): at 9 positions S.W. of Eddystone, 40-43 fm. (Crawshay, 1912, p. 368, as Craspedochilus onyx) SALCOMBE. Common in dredge material (Allen and Todd, 1900, p. 210) LEPIDOPLEURUS, CANCELLATUS (Sowerby) [Forbes and Hanley, 1849, II, p. 410, as Chiton; Matthews. 1953, p. 246] Wembury West Reef, three specimens at E.L.W.S.T. by J. Brady, 28.3.56 (G.M.S.) Family Lepidochitonidae TONICELLA RUBRA (L.) [Forbes and Hanley, 1849, II, p.
    [Show full text]
  • Central Mediterranean Sea) Subtidal Cliff: a First, Tardy, Report
    Biodiversity Journal , 2018, 9 (1): 25–34 Mollusc diversity in Capo d’Armi (Central Mediterranean Sea) subtidal cliff: a first, tardy, report Salvatore Giacobbe 1 & Walter Renda 2 ¹Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale F. Stagno d’Al - contres 31, 98166 Messina, Italy; e-mail: [email protected] 2Via Bologna, 18/A, 87032 Amantea, Cosenza, Italy; e-mail: [email protected] ABSTRACT First quantitative data on mollusc assemblages from the Capo d’Armi cliff, at the south en - trance of the Strait of Messina, provided a baseline for monitoring changes in benthic biod- iversity of a crucial Mediterranean area, whose depletion might already be advanced. A total of 133 benthic taxa have been recorded, and their distribution evaluated according to depth and seasonality. Bathymetric distribution showed scanty differences between the 4-6 meters and 12-16 meters depth levels, sharing all the 22 most abundant species. Season markedly affected species composition, since 42 taxa were exclusively recorded in spring and 35 in autumn, contrary to 56 shared taxa. The occurrence of some uncommon taxa has also been discussed. The benthic mollusc assemblages, although sampled in Ionian Sea, showed a clear western species composition, in accordance with literature placing east of the Strait the bound- ary line between western and eastern Mediterranean eco-regions. Opposite, occasional records of six mesopelagic species, which included the first record for this area of Atlanta helicinoi - dea
    [Show full text]
  • T.C. Ordu Üniversitesi Fen Bilimleri Enstitüsü Orta
    T.C. ORDU ÜNİVERSİTESİ FEN BİLİMLERİ ENSTİTÜSÜ ORTA KARADENİZ’DEKİ MOLLUSCA FAUNASI VE KATALOGLANMASI MUSTAFA BİÇER Bu tez, Balıkçılık Teknolojisi Mühendisliği Anabilim Dalında Yüksek Lisans derecesi için hazırlanmıştır. ORDU 2014 TEZ BİLDİRİMİ Tez yazım kurallarına uygun olarak hazırlanan bu tezin yazılmasında bilimsel ahlak kurallarına uyulduğunu, başkalarının eserlerinden yararlanılması durumunda bilimsel normlara uygun olarak atıfta bulunulduğunu, tezin içerdiği yenilik ve sonuçların başka bir yerden alınmadığını, kullanılan verilerde herhangi bir tahrifat yapılmadığını, tezin herhangi bir kısmının bu üniversite veya başka bir üniversitedeki başka bir tez çalışması olarak sunulmadığını beyan ederim. İmza Mustafa BİÇER Not: Bu tezde kullanılan özgün ve başka kaynaktan yapılan bildirişlerin, çizelge, şekil ve fotoğrafların kaynak gösterilmeden kullanımı, 5846 sayılı Fikir ve Sanat Eserleri Kanunundaki hükümlere tabidir. I ÖZET ORTA KARADENİZ’ DEKİ MOLLUSCA FAUNASI VE KATALOGLANMASI Mustafa BİÇER Ordu Üniversitesi Fen Bilimleri Enstitüsü Balıkçılık Teknolojisi Mühendisliği Anabilim Dalı, 2014 Yüksek Lisans Tezi, 60s Danışman: Yrd. Doç. Dr. Mehmet AYDIN Bu çalışma ile Orta Karadeniz’de birçok sayıda familya ve cins ile temsil edilen mollusca sınıfına ait türlerin Ordu İlindeki dağılımının belirlenmesi ve araştırılması amaçlanmıştır. Mollusca türlerini tespit etmek amacıyla gerçekleştirilen bu çalışmada, derinlikleri 0-25 m arasında değişen 14 istasyondan örneklemeler yapılmıştır. Araştırma mediolittoral bölgeden elle, dalarak ve el direcleri
    [Show full text]
  • Early Ontogeny and Palaeoecology of the Mid−Miocene Rissoid Gastropods of the Central Paratethys
    Early ontogeny and palaeoecology of the Mid−Miocene rissoid gastropods of the Central Paratethys THORSTEN KOWALKE and MATHIAS HARZHAUSER Kowalke, T. and Harzhauser, M. 2004. Early ontogeny and palaeoecology of the Mid−Miocene rissoid gastropods of the Central Paratethys. Acta Palaeontologica Polonica 49 (1): 111–134. Twenty−six species of Rissoidae (Caenogastropoda: Littorinimorpha: Rissooidea) are described from the Badenian and Early Sarmatian of 14 localities in Austria and the Czech Republic (Molasse Basin, Styrian Basin, Vienna Basin) and from the Badenian of Coştei (Romania). For the first time, the early ontogenetic skeletal characters of these gastropods are de− scribed. Based on these features an indirect larval development with a planktotrophic veliger could be reconstructed for all investigated Mid−Miocene species. The status of Mohrensterniinae as a subfamily of the Rissoidae is confirmed by the mor− phology of the low conical protoconch, consisting of a fine spirally sculptured embryonic shell and a larval shell which is smooth except for growth lines. Transitions from embryonic shells to larval shells and from larval shells to teleoconchs are slightly thickened and indistinct. Whilst representatives of the subfamily Rissoinae characterise the marine Badenian assem− blages, Mohrensterniinae predominate the Early Sarmatian faunas. We hypothesize that this take−over by the Mohren− sterniinae was triggered by changes in the water chemistry towards polyhaline conditions. Consequently, the shift towards hypersaline conditions in the Late Sarmatian is mirrored by the abrupt decline of the subfamily. Four new species Rissoa costeiensis (Rissoinae) from the Badenian and Mohrensternia hollabrunnensis, Mohrensternia pfaffstaettensis,and Mohrensternia waldhofensis (Mohrensterniinae) from the Early Sarmatian are introduced.
    [Show full text]
  • Mollusca) Found Along the Brazilian Coast, with Two New Synonymies in the Genus Gadila Gray, 1847
    Biota Neotrop., vol. 13, no. 2 A commented list of Scaphopoda (Mollusca) found along the Brazilian coast, with two new synonymies in the genus Gadila Gray, 1847 Leonardo Santos de Souza1,2, Isabella Campos Vieira Araújo1 & Carlos Henrique Soares Caetano1 1Departamento de Zoologia, Instituto de Biociências, Universidade Federal do Estado do Rio de Janeiro – UNIRIO, Av. Pasteur, 458, Urca, CEP 22290-240, Rio de Janeiro, RJ, Brasil 2Corresponding author: Leonardo Santos de Souza, e-mail: [email protected] SOUZA, L.S., ARAÚJO, I.C.V. & CAETANO, C.H.S. A commented list of Scaphopoda (Mollusca) found along the Brazilian coast, with two new synonymies in the genus Gadila Gray, 1847. Biota Neotrop. (13)2: http://www.biotaneotropica.org.br/v13n2/en/abstract?inventory+bn03213022013 Abstract: This review aims to present an updated checklist of scaphopods, based mainly on literature database. There is a total of 40 species (six families) for Brazil, including information about the distribution and bathymetric range of each taxon. We propose two synonyms with the aid of morphometry of the shell, for the genus Gadila: G. longa as junior synonym of G. elongata and G. robusta as junior synonym of G. pandionis. Keywords: scaphopods, morphometry, synonyms, distribution, bathymetry. SOUZA, L.S., ARAÚJO, I.C.V. & CAETANO, C.H.S. Lista comentada dos Scaphopoda (Mollusca) encontrados ao longo da costa Brasileira, com duas novas sinonímias no gênero Gadila Gray, 1847. Biota Neotrop. 13(2): http://www.biotaneotropica.org.br/v13n2/pt/abstract?inventory+bn0321302201 Resumo: Uma lista atualizada dos escafópodes da costa brasileira pertencentes a seis famílias é apresentada baseada principalmente em dados da literatura.
    [Show full text]
  • Accepted Manuscript
    Accepted Manuscript 8000years of coastal changes on a western Mediterranean island: A multiproxy approach from the Posada plain of Sardinia Rita T. Melis, Federico Di Rita, Charles French, Nick Marriner, Francesca Montis, Giovanni Serreli, Federica Sulas, Matteo Vacchi PII: S0025-3227(17)30532-7 DOI: doi:10.1016/j.margeo.2018.05.004 Reference: MARGO 5794 To appear in: Marine Geology Received date: 1 November 2017 Revised date: 23 April 2018 Accepted date: 14 May 2018 Please cite this article as: Rita T. Melis, Federico Di Rita, Charles French, Nick Marriner, Francesca Montis, Giovanni Serreli, Federica Sulas, Matteo Vacchi , 8000years of coastal changes on a western Mediterranean island: A multiproxy approach from the Posada plain of Sardinia. The address for the corresponding author was captured as affiliation for all authors. Please check if appropriate. Margo(2017), doi:10.1016/j.margeo.2018.05.004 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT 8000 YEARS OF COASTAL CHANGES ON A WESTERN MEDITERRANEAN ISLAND: A MULTIPROXY APPROACH FROM THE POSADA PLAIN OF SARDINIA Rita T. Melis1⁎, Federico Di Rita2, Charles
    [Show full text]
  • The Ultrastructure of Spermatozoa and Spermiogenesis in Pyramidellid Gastropods, and Its Systematic Importance John M
    HELGOLANDER MEERESUNTERSUCHUNGEN Helgol~inder Meeresunters. 42,303-318 (1988) The ultrastructure of spermatozoa and spermiogenesis in pyramidellid gastropods, and its systematic importance John M. Healy School of Biological Sciences (Zoology, A08), University of Sydney; 2006, New South Wales, Australia ABSTRACT: Ultrastructural observations on spermiogenesis and spermatozoa of selected pyramidellid gastropods (species of Turbonilla, ~gulina, Cingufina and Hinemoa) are presented. During spermatid development, the condensing nucleus becomes initially anterio-posteriorly com- pressed or sometimes cup-shaped. Concurrently, the acrosomal complex attaches to an electron- dense layer at the presumptive anterior pole of the nucleus, while at the opposite (posterior) pole of the nucleus a shallow invagination is formed to accommodate the centriolar derivative. Midpiece formation begins soon after these events have taken place, and involves the following processes: (1) the wrapping of individual mitochondria around the axoneme/coarse fibre complex; (2) later internal metamorphosis resulting in replacement of cristae by paracrystalline layers which envelope the matrix material; and (3) formation of a glycogen-filled helix within the mitochondrial derivative (via a secondary wrapping of mitochondria). Advanced stages of nuclear condensation {elongation, transformation of fibres into lamellae, subsequent compaction) and midpiece formation proceed within a microtubular sheath ('manchette'). Pyramidellid spermatozoa consist of an acrosomal complex (round
    [Show full text]
  • Pyramidellidae, Philinidae Et Retusidae De La Région De
    PYRAMIDELLIDAE, PHILINIDAE ET RETUSIDAE DE LA RÉG ION DE ROSCOFF. ÉTUDE PARTICULIÈRE DES PROTOCONQUES DE QUELQUES ESPÈCES. (I) par Celso Rodriguez Babio ( 2 ) e t Catherine Thiriot-Quiévreux Station biologique de Roscoff et Centre océanologique de Bretagne (Brest). Résumé Des observations au microscope électronique à balayage ont été effectuées sur les coquilles de plusieurs espèces de Gastéropodes de la région de Roscoff : Pyra­ midellidae, Odostomia acuta, 0. unidentata, O. turrita, O. plicata, O. scalaris, O. lukisi, Turbonilla crenata, T. elegantissima, T. innovata, Chrysallida decussata, C. excavata, C. obtusa, C. spiralis, Evalea obliqua Philinidae, ; Philine catena ; R etu ­ sid ae, Retusa mammillata, R. truncatula. La protoconque et les premiers tours de spire juvéniles sont plus particuliè­ rement étudiés. Parmi les Pyramidellidae, nous avons séparé quatre types de protoconques : — type A : protoconque sénestre, turriculée, axe d’enroulement perpendiculaire à celui de la téloconque ; présent chez Odostomia acuta, O. unidentata, O. turrita, O. plicata et Turbonilla elegantissima, espèces à développement pélagique (ana­ logue à celui de O. acuta décrit par Thorsoni ; — type B : protoconque sénestre, globuleuse et à enroulement planorbiforme ; présent chez Turbonilla crenata, espèce à développement pélagique ; — type C : protoconque sénestre, apex masqué par le dernier tour de spire et avec une petite ornementation granuleuse, présent chez Evalea obliqua, espèce à déve­ loppement direct ou à très courte phase pélagique ; — type D : protoconque sénestre et lisse, apex masqué par le dernier tour de spire ; présent chez Odostomia scalaris, Turbonilla innovata, Chrysallida decussata, C. excavata, C. obtusa, C. spiralis, espèces à développement direct ou à très courte phase pélagique (analogue à celui deOdostomia eulimoides, décrit par Lebouri.
    [Show full text]