DOCSLIB.ORG

Author's Personal Copy

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Author's Personal Copy Author's personal copy Journal of South American Earth Sciences 42 (2013) 216e241 Contents lists available at SciVerse ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames Ostracods (Crustacea) and their palaeoenvironmental implication for the Solimões Formation (Late Miocene; Western Amazonia/Brazil) Martin Gross a,*, Maria Ines Ramos b, Marco Caporaletti c, Werner E. Piller c a Department for Geology and Palaeontology, Universalmuseum Joanneum, Weinzöttlstrasse 16, 8045 Graz, Austria b Coordenação de Ciências da Terra e Ecologia, Museu Paraense Emílio Goeldi, Avenida Perimetral, s/n Terra Firme, Belém-PA 66077-830, Brazil c Institute for Earth Sciences, Karl-Franzens-University, Heinrichstrasse 26, 8010 Graz, Austria article info abstract Article history: Western Amazonia’s landscape and biota were shaped by an enormous wetland during the Miocene Received 5 March 2012 epoch. Among the most discussed topics of this ecosystem range the question on the transitory influx of Accepted 5 October 2012 marine waters. Inter alia the occurrence of typically brackish water associated ostracods is repeatedly consulted to infer elevated salinities or even marine ingressions. The taxonomical investigation of Keywords: ostracod faunas derived from the upper part of the Solimões Formation (Eirunepé; W-Brazil) documents Western Amazonia a moderately diverse assemblage (19 species). A wealth of freshwater ostracods (mainly Cytheridella, Late Miocene Penthesilenula) was found co-occurring with taxa (chiefly Cyprideis) usually related to marginal marine Solimões Formation d18 d13 Palaeoenvironments settings today. The observed faunal compositions as well as constantly very light O- and C-values Ostracoda obtained by measuring both, the freshwater and brackish water ostracod group, refer to entirely freshwater conditions. These results corroborate with previous sedimentological and palaeontological observations, which proposed a fluvial depositional system for this part of western Amazonia during the Late Miocene. We demonstrate that some endemic, “brackish” water ostracods (i.e., Cyprideis)havebeen effectively adapted to freshwater conditions. Thus, their occurrence is no univocal evidence for the influence of brackish or marine waters in western Amazonia during the Miocene. Ó 2012 Elsevier Ltd. All rights reserved. 1. Introduction and bivalves have been studied intensively during the last years and revealed (aside essential palaeoenvironmental and bio- Today, lowland Amazonia is famous for its biodiversity, which stratigraphical results) prime examples for speciation events obviously root in pre-Quaternary times (e.g., Haffer, 2008; Hoorn related to a variety of ecological factors. Thus, fundamental ques- et al., 2010a; Jaramillo et al., 2010; Wesselingh et al., 2010). The tions of evolutionary biology are touched based on the fossil record evolution of the modern Amazon system and its precursors is (e.g., Wesselingh, 2007; Anderson et al., 2010). Comparably, ostra- synoptically summarised recently (Hoorn and Wesselingh, 2010; cods experienced an extensive radiation during the “Pebas phase” Hoorn et al., 2010a). However, it remains heavily disputed by e.g., (especially the genus Cyprideis; e.g., Whatley et al., 1998), which is, Latrubesse et al. (2007, 2010). Nevertheless, from a palaeobiological however, less well documented and understood. point of view the proposed Middle to (early) Late Miocene “Pebas Studies on Neogene ostracods from the “Pebas system”, started system” (Hoorn et al., 2010a) is of outstanding interest. Albeit of its with the fundamental work of Purper (1977, 1979), followed by still debated nature (mega-lake, e.g., Wesselingh et al., 2002; mega- contributions of Sheppard and Bate (1980), Purper and Pinto (1983, wetland, e.g., Hoorn et al., 2010b; mega-fan (partly), e.g., Latrubesse 1985), Purper and Ornellas (1991) and Swain (1998). Later, the et al., 2010) and chronology, this vast wetland (w1 million km2; comprehensive research of Muñoz-Torres et al. (1998), Whatley Fig. 1a) shaped western Amazonia’s landscapes and life for several et al. (1998, 2000) significantly improved ostracod taxonomy and millions of years. Among aquatic biota it holds a spectacularly stimulated an initial ostracod based biozonation as well as phylo- diverse, largely endemic mollusc and ostracod fauna. Gastropods genetic hypotheses. Additional publications come from Ramos (2006), Celestino and Ramos (2007), Ramos et al. (2009). Lately, the state of the art in ostracodological research is reviewed by * Corresponding author. Tel.: þ43 316 8017 9733; fax: þ43 316 8017 9671. Wesselingh and Ramos (2010). E-mail addresses: [email protected] (M. Gross), mramos@ museu-goeldi.br (M.I. Ramos), [email protected] (M. Caporaletti), The current paper investigates ostracod faunas originating from [email protected] (W.E. Piller). a region, which is suggested to be situated at the edge of the “Pebas 0895-9811/$ e see front matter Ó 2012 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.jsames.2012.10.002 Author's personal copy M. Gross et al. / Journal of South American Earth Sciences 42 (2013) 216e241 217 Fig. 1. Location of the study area around Eirunepé (western Amazonia). (a) Schematic illustration of the maximal extent of the “Pebas system” (¼ hatched area) during the Middle Miocene after Wesselingh (2008). (b) Location of investigated outcrops along the cut banks of the Juruá and Tarauacá River. system” e both in terms of palaeogeography and time (Eirunepé (1977), Purper (1979), Hoorn (1994), Latrubesse et al. (1997, area, western Brazil; Wesselingh et al., 2006a; Wesselingh and 2010), Hoorn et al. (2010b) and Silva-Caminha et al. (2010). Ramos, 2010; Figueiredo, 2012; Fig. 1a, b). We aim to provide a profound taxonomical base, which is crucial for forthcoming palaeoecological, biostratigraphical and phylogenetic research. Our 3. Materials and methods systematic evaluation is supplemented by compilations of the autecology as well as by detailed illustrations, inclusively of For micropalaeontological investigations bulk samples (w1e2kg) different sexes and ontogenetic stages. Ostracodological results of were taken from all outcrops under investigation (Gross et al., 2011). the present study are complementary to an earlier sedimentolog- 500 g of dried sediment (40 C, 24 h) were washed by using diluted fl ical analysis, which documented an aggrading uvial system as hydrogen superoxide for disintegration through standard sieves depositional environment for the examined outcrops (Gross et al., (H2O2:H2O ¼ 1:5; 63/125/250/500 mm). Wet sieve residuals were 2011). washed with ethanol (70%) before drying (40 C, 24 h). Residuals 250 mm were picked out completely and subject of 2. Geological setting detailed taxonomic investigations. From the 125 mm sieve-residual 0.2 g/sample were picked, which contained mainly, hardly distin- The sampled sections are situated along the river banks of the guishable juvenile and/or fragmented ostracod valves. Therefore Juruá and Tarauacá River, NE respectively SE of Eirunepé (state of the following taxa are not further differentiated within this fraction Amazonia; Solimões Basin (Jandiatuba Sub-Basin); e.g., Caputo, (for details see ESM 1): Cypria sp. and Physocypria sp. are counted as 1991; Wanderley-Filho et al., 2010; Fig. 1a, b). Aside Quaternary Cypria/Physocypria. Cyprideis graciosa, Cyprideis longispina, Cypri- deposits (alluvium, terraces) the studied outcrops (Remanso, deis pebasae, C. aff. pebasae, Cyprideis sp. 1 and 2 are summarised Aquidabã, Morada Nova, Pau D’Alho, Torre da Lua, Barro Branco) under Cyprideis “ornate” as well as Cyprideis aff. machadoi and expose sediments of the upper part of the Solimões Formation Cyprideis ?olivencai are subsumed under Cyprideis “smooth”. (Del’ Arco et al., 1977; Maia et al., 1977; Paz et al., in press). Prior to stable isotope analyses (d18O, d13C; 48 measurements) Detailed sedimentological descriptions of these locations and ostracod valves were additionally washed with distilled water in an interpretations are already presented in Gross et al. (2011) to ultrasonic bath and rinsed in ethanol finally. Adults and juveniles which we refer here. (A-1 instars) of 5 species were measured: C. pebasae, C. graciosa, The more than 1000 m thick Solimões Fm. covers most of Cytheridella danielopoli, Penthesilenula olivencae (only adults), western Amazonia and comprises peliticesandy alternations, Rhadinocytherura amazonensis (only adults). The number of valves lignitic intercalation as well as paleosols. Diverging views on in its required for analyses (w50 mg) varied between 2 and 7. For analyses definition, its stratigraphical and geographical range as well of its a Thermo-Finnigan Kiel II automated reaction system and depositional environments clearly mirror the controversially a Thermo-Finnigan Delta Plus isotope-ratio mass spectrometer debated history of Amazonia through Neogene times. In-depth were used (University of Graz; standard deviation ¼ 0.1& relative reviews of the Solimões Fm. are provided by e.g., Del’ Arco et al. to NBS-19; results in per mille relative to VPDB). Author's personal copy 218 M. Gross et al. / Journal of South American Earth Sciences 42 (2013) 216e241 4. Results Juveniles of Vestalenula Rossetti & Martens, 1998 have antero- and posteroventral teeth in left valves (which are absent in adults) 4.1. Systematic palaeontology and no external posteroventral keel in right valves
Load more

Recommended publications
  • 15 International Symposium on Ostracoda
    Berliner paläobiologische Abhandlungen 1-160 6 Berlin 2005 15th International Symposium on Ostracoda In Memory of Friedrich-Franz Helmdach (1935-1994) Freie Universität Berlin September 12-15, 2005 Abstract Volume (edited by Rolf Kohring and Benjamin Sames) 2 ---------------------------------------------------------------------------------------------------------------------------------------- Preface The 15th International Symposium on Ostracoda takes place in Berlin in September 2005, hosted by the Institute of Geological Sciences of the Freie Universität Berlin. This is the second time that the International Symposium on Ostracoda has been held in Germany, following the 5th International Symposium in Hamburg in 1974. The relative importance of Ostracodology - the science that studies Ostracoda - in Germany is further highlighted by well-known names such as G.W. Müller, Klie, Triebel and Helmdach, and others who stand for the long tradition of research on Ostracoda in Germany. During our symposium in Berlin more than 150 participants from 36 countries will meet to discuss all aspects of living and fossil Ostracoda. We hope that the scientific communities working on the biology and palaeontology of Ostracoda will benefit from interesting talks and inspiring discussions - in accordance with the symposium's theme: Ostracodology - linking bio- and geosciences We wish every participant a successful symposium and a pleasant stay in Berlin Berlin, July 27th 2005 Michael Schudack and Steffen Mischke CONTENT Schudack, M. and Mischke, S.: Preface
    [Show full text]
  • 2.6 Reproductive System
    Edith Cowan University Copyright Warning You may print or download ONE copy of this document for the purpose of your own research or study. The University does not authorise you to copy, communicate or otherwise make available electronically to any other person any copyright material contained on this site. You are reminded of the following: • Copyright owners are entitled to take legal action against persons who infringe their copyright. • A reproduction of material that is protected by copyright may be a copyright infringement. • A court may impose penalties and award damages in relation to offences and infringements relating to copyright material. Higher penalties may apply, and higher damages may be awarded, for offences and infringements involving the conversion of material into digital or electronic form. EDITH COWAN UNIVERSITY EVOLUTION,SYSTEMATICS & GEOGRAPHIC PARTHENOGENESIS OF Ilyodromus (CRUSTACEA,OSTRACODA) by Rylan James Shearn, BSc Hons A thesis submitted to Edith Cowan University in accordance with requirements for the degree of Doctor of Philosophy Submitted 27th February 2015 HAPTER C 2 AN INTRODUCTION TO MORPHOLOGY OFTHE CYPRIDOIDEA (CRUSTACEA,OSTRACODA) 2.1 Abstract Several chapters of this thesis frequently use specialist terminology to iden- tify and describe morphological features of ostracods from the superfam- ily Cypridoidea. To assist the non-specialist reader, this chapter guides the reader through a series of illustrations that serve to explain the fundamen- tal terms and concepts required to interpret these descriptive sections. It is hoped that this chapter will serve as a basic guide, or atlas from which read- ers can refer back to while reading the remainder of the thesis.
    [Show full text]
  • Non-Commercial Use Only
    J. Limnol., 2017; 76(1): 68-84 ORIGINAL ARTICLE DOI: 10.4081/jlimnol.2016.1480 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). Candona alchichica (Podocopida: Candonidae), a new ostracod species from saline, tropical Lake Alchichica, Mexico Sergio COHUO,1* María del Carmen HERNÁNDEZ,2 Liseth PÉREZ,3 Javier ALCOCER4 1Institut für Geosysteme und Bioindikation, Technische Universität Braunschweig, Langer Kamp 19c D-38106 Braunschweig, Germany; 2Universidad Nacional Autónoma de México, Programa de Posgrado en Ciencias del Mar y Limnología, México; 3Universidad Nacional Autónoma de México, Instituto de Geología. Circuito Institutos. Ciudad Universitaria, Delegación Coyoacán. C.P. 4510, Ciudad de México, México; 4Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Iztacala, Proyecto de Investigación en Limnología Tropical, Av. de los Barrios No. 1, Los Reyes Iztacala, 54090 Tlalnepantla, Estado de México, México *Corresponding author: [email protected] ABSTRACT In North America, most species of the Candonidae family belong to the genus Candona. These species are frequently found in freshwater ecosystems and in sediment sequences, which makes them valuable tools for paleoenvironmental reconstructions. Knowledge of Mexican Candona species is limited, however, and scant information exists regarding their taxonomy and ecology. Here we describe Candona alchichica, a new ostracod species we suggest being endemic to Lake Alchichica, central Mexico.only The species belongs to the acuminata group of species, based on the presence of 5+1 setae on the second segment of the mandibular palp. It is closely related to C. patzcuaro, C. tahoensis and C. ohioensis, but differs from those species in that the females have an elongated genital field, wide at the base and narrow at the end.
    [Show full text]
  • 21 Ostracoda
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Servicio de Difusión de la Creación Intelectual 21 OSTRACODA Cecilia Laprida OSTRACODA Sara Ballent INTRODUCCIÓN sido relacionados con los ostrácodos, pero los estudios morfológicos de las partes blandas de Los ostrácodos constituyen una clase de crus- ejemplares preservados excepcionalmente, per- táceos de hábitos acuáticos y morfológicamen- mitirían afirmar que no serían verdaderos os- te muy conservadores, fácilmente identificables trácodos (Hou et al., 1996; Siveter et al., 2001). De- por su pequeña talla y la presencia de un bido a sus reducidas dimensiones, los ostráco- exoesqueleto o caparazón bivalvo, de naturale- dos son objeto de estudio de la Micropaleontolo- za quitinoso-calcárea, que cubre completamen- gía. Esto implica técnicas especiales de muestreo, te las partes blandas. El tamaño de un ostrácodo preparación y observación. Dentro de esta disci- adulto oscila entre los 0,15 y los 2-3 mm, si bien plina, conforman uno de los grupos de mayor algunas especies de agua dulce alcanzan los 8 importancia, por lo que numerosos investigado- mm; las de Gigantocypris miden hasta 32 mm y res están dedicados a su estudio. Históricamen- algunas paleozoicas del género Leperditia, llega- te, la importancia de estos artrópodos se basó en ron a los 50 mm. sus aplicaciones bioestratigráficas asociadas a El caparazón está compuesto por carbonato la industria del petróleo pero, en la actualidad, la de calcio en forma de calcita con proporciones mayoría de las investigaciones se desarrollan en variables de magnesio, recubierto externamen- centros académicos y se hallan más relaciona- te por una capa de quitina.
    [Show full text]
  • Crustacea: Ostracoda) De Pozas Temporales
    Heterocypris bosniaca (Petkowski et al., 2000): Ecología y ontogenia de un ostrácodo (Crustacea: Ostracoda) de pozas temporales. ESIS OCTORAL T D Josep Antoni Aguilar Alberola Departament de Microbiologia i Ecologia Universitat de València Programa de doctorat en Biodiversitat i Biologia Evolutiva Heterocypris bosniaca (Petkowski et al., 2000): Ecología y ontogenia de un ostrácodo (Crustacea: Ostracoda) de pozas temporales. Tesis doctoral presentada por Josep Antoni Aguilar Alberola 2013 Dirigida por Francesc Mesquita Joanes Imagen de cubierta: Vista lateral de la fase eclosionadora de Heterocypris bosniaca. Más detalles en el capítulo V. Tesis titulada "Heterocypris bosniaca (Petkowski et al., 2000): Ecología y ontogenia de un ostrácodo (Crustacea: Ostracoda) de pozas temporales" presentada por JOSEP ANTONI AGUILAR ALBEROLA para optar al grado de Doctor en Ciencias Biológicas por la Universitat de València. Firmado: Josep Antoni Aguilar Alberola Tesis dirigida por el Doctor en Ciencias Biológicas por la Universitat de València, FRANCESC MESQUITA JOANES. Firmado: F. Mesquita i Joanes Profesor Titular de Ecología Universitat de València A Laura, Paco, i la meua família Resumen Los ostrácodos son un grupo de pequeños crustáceos con amplia distribución mundial, cuyo cuerpo está protegido por dos valvas laterales que suelen preservarse con facilidad en el sedimento. En el presente trabajo se muestra la primera cita del ostrácodo Heterocypris bosniaca Petkowski, Scharf y Keyser, 2000 para la Península Ibérica. Se trata de una especie de cipridoideo muy poco conocida que habita pozas de aguas temporales. Se descubrió el año 2000 en Bosnia y desde entonces solo se ha reportado su presencia en Israel (2004) y en Valencia (presente trabajo).
    [Show full text]
  • Soft Body Morphology, Dissection and Slide-Preparation of Ostracoda: a Primer
    Joannea Geol. Paläont. 11: 327-343 (2011) Soft body morphology, dissection and slide-preparation of Ostracoda: a primer Tadeusz NAMIOTKO, Dan L. DANIELOPOL & Angel BALTANÁS Abstract: Most commonly used techniques for treating ostracod soft body for taxonomi- cal purposes with optical microscopy are described with emphasis on the order Podo- copida. A variety of procedures for pre-treatment, storage, recovery of dried specimens, dissection, temporary and permanent mounting, and staining methods are presented and evaluated. General morphology and terminology of the ostracod appendages are also summarised. Key Words: Ostracoda; Dissection; Mounting; Staining; Appendages; Morphology. 1. Introduction One of best diagnostic and most conspicuous trait of Ostracoda is a bivalved carapace that may completely envelop the whole animal body with limbs. Ostracodologists usu- ally refer to calcified valves as “hard parts”, whereas to the appendages and other in- ternal organs as „soft parts”. The classification of Recent ostracods is based mainly on differences in the soft part morphology which is ordinarily of little use by palaeontolo- gists. However, considering the close functional relationship often existing between the soft and hard parts, each expressing to a considerable extent the morphology of the other, even basic knowledge on the appendages without doubt should help palaeonto- logists to better understand and interpret various features displayed in the valves of the fossil ostracods. Examining living material collected from modern habitats enables pa- laeontologists also to become familiar with intraspecific variability or ecology, which could greatly facilitate both taxonomical and palaeoenvironmental studies. Therefore the morphology and terminology of the soft parts of ostracods is outlined (focusing on limbs) in this primer prior to the description of various laboratory techniques involved in the appendage preparation for optical microscopy.
    [Show full text]
  • CLASE OSTRACODA. Orden Podocopida
    Revista IDE@ - SEA, nº 74 (30-06-2015): 1–10. ISSN 2386-7183 1 Ibero Diversidad Entomológica @ccesible www.sea-entomologia.org/IDE@ Clase: Ostracoda Orden Podocopida Manual CLASE OSTRACODA Orden Podocopida Ángel Baltanás1 & Francesc Mesquita-Joanes2 1 Dep. Ecología (Fac. Ciencias), Universidad Autónoma de Madrid, C/ Darwin, 2, 28049 Madrid (España). [email protected] 2 Inst. “Cavanilles” de Biodiversidad y Biología Evolutiva, Universidad de Valencia, Av. Dr. Moliner, 50, 46100 Burjassot (España). [email protected] 1. Breve definición del grupo y principales caracteres diagnósticos Según el criterio más extendido actualmente, y que aquí seguiremos, se considera a los ostrácodos como una clase (Cl. Ostracoda) del Subphylum Crustacea, perteneciente al Phylum Arthropoda. No obstante, existen autores que defienden su pertenencia, como subclase, a la clase Maxillopoda (que incluiría tam- bién a branquiuros, tantulocáridos, copépodos y cirrípedos, entre otros). Más allá de esta circunstancia, los ostrácodos pueden describirse como crustáceos de tamaño mediano a pequeño (desde los 0,2 a los 5 mm; con casos excepcionales que alcanzan los 3 cm), que poseen un ojo naupliar medial, con la segmen- tación corporal severamente reducida, entre cinco y ocho pares de apéndices y, como elemento más significativo, la presencia de un caparazón bivalvo. Aunque el caparazón contiene en sí mismo rasgos diagnósticos (tamaño, forma, ornamentación...) que ayudan a la correcta asignación taxonómica de los ostrácodos, su presencia—que obstaculiza la observación in vivo de muchos detalles diagnósticos del animal— y el pequeño tamaño de estos organismos obligan con frecuencia a la disección de los ejempla- res para su identificación, especialmente para la identificación a nivel específico.
    [Show full text]
  • ©Zoologische Staatssammlung München;Download
    ©Zoologische Staatssammlung München;download: http://www.biodiversitylibrary.org/; www.biologiezentrum.at SPIXIANA ©Zoologische Staatssammlung München;download: http://www.biodiversitylibrary.org/; www.biologiezentrum.at marked reduction in unnecessary parts, while the In the present paper, I propose an hypothetical an- functional parts are strongly developed. Therefore, cestral ostracod antennula which is quite different it is sometimes difficult to recognize the various from the "ground plan" ostracod limb proposed by components of a primitive crustacean limb part. Hartmann (1966) (comprising all three protopod The antennula has retained a clearly recogniz- segments, several endites and two epipodites, four able biramous form in two crustacean ciasses, segmented endopod and eight segmented exopod), Remipedia and Malacostraca; while in four others however, in contrast to Maddocks (2000), with the (Branchiopoda, Maxillopoda, Cephalocarida and clear presence of two rami (Fig. 3). The presence of Ostracoda) it has undergone profound reductions the exopod remnants on the darwinulid antennula (for the illustration of the antennula in different (Fig. 5) indicates that this ramus existed in the os- crustacean ciasses see Brusca & Brusca 1990). In tracod ancestor. Using topology as an important tool Ostracoda the antennula has a maximum of eight in the search for homology (Rieppel 1994), it would articles and has sensory and locomotory functions. be possible to distinguish between protopod, endo- In the subclass Myodocopa the antennula of most pod and exopod on the antennula in the recent species shows sexual dimorphism (see Poulsen 1962, Ostracoda. 1965, Hörne et al. 2002). Many authors, especially To aid comparison between taxa and to facilitate recent ones, consider the ostracod antennula to be the identification of homologous structures, a Stand- uniramous, lacking any trace of protopod, endopod ard terminology was adopted (Huys & Boxshall and exopod, and refer to all articles as podomeres 1991).
    [Show full text]
  • Crustacea, Ostracoda
    ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: European Journal of Taxonomy Jahr/Year: 2020 Band/Volume: 0631 Autor(en)/Author(s): Savatenalinton Sukonthip Artikel/Article: A new cypridopsine genus (Crustacea, Ostracoda) from Thailand 1-16 European Journal of Taxonomy 631: 1–16 ISSN 2118-9773 https://doi.org/10.5852/ejt.2020.631 www.europeanjournaloftaxonomy.eu 2020 · Savatenalinton S. This work is licensed under a Creative Commons Attribution Licence (CC BY 4.0). Research article urn:lsid:zoobank.org:pub:9F648B8F-D4DC-4B14-A921-673D50F93CCA A new cypridopsine genus (Crustacea, Ostracoda) from Thailand Sukonthip SAVATENALINTON Department of Biology, Faculty of Science, Mahasarakham University, Maha Sarakham 44150, Thailand. Email: [email protected] urn:lsid:zoobank.org:author:254994A1-C8E1-4242-ADF8-184661366B2D Abstract. A new cypridopsine genus, Cyprettadopsis gen. nov., described here, is principally characterized by the reduced caudal ramus, the strongly serrated claw G2 of the antenna (A2), the A2 subquadrate terminal segment, the undivided penultimate segment of the second thoracopod (T2), the morphology of the third thoracopod bearing a distinctly separated terminal segment, the complete septa on the posteroventral margin and the incomplete septa on the anterior margin of both valves. Based on a combination of these characters, a new tribe, Cyprettadopsini trib. nov., is created in the subfamily Cypridopsinae Kaufmann, 1900 to accommodate this new genus, and one new species, Cyprettadopsis sutura gen. et sp. nov., is described as the type species. Apart from the above generic characters, the following features are also typical of the new species: the tiny needlepoint-like pores along the anterior and ventral margins of both valves, the remarkably large β-seta on the mandibular palp and the considerably short d2 seta on the T2.
    [Show full text]
  • Diversity of Freshwater Ostracods (Crustacea, Ostracoda) in Marginal Habitats of the Province of Parma (Northern Italy)
    J. Limnol., 65(2): 121-131, 2006 Small is beautiful: diversity of freshwater ostracods (Crustacea, Ostracoda) in marginal habitats of the province of Parma (Northern Italy) Giampaolo ROSSETTI*, Koen MARTENS1), Claude MEISCH2), Stefano TAVERNELLI and Valentina PIERI Department of Environmental Sciences, University of Parma, Viale G.P. Usberti 33A, 43100 Parma, Italy 1)Royal Belgian Institute of Natural Sciences, Freshwater Biology, Vautierstraat 29, 1000 Brussels, Belgium 2)Musée d'Histoire Naturelle, 25 rue Münster, 2160 Luxembourg, Grand Duchy of Luxembourg *e-mail corresponding author: [email protected] ABSTRACT A study on the distribution of ostracods in small freshwater habitats of the province of Parma was conducted from May 2004 to December 2005. Vernal pools, ponds, shallow lakes, fountains, springs, ditches, canals, and streams were among the most common types of aquatic systems included in this survey. Altogether, 90 sites located between 24 and 1557 m a.s.l. were visited, and 125 samples were collected. 41 samples did not contain ostracods, and 7 samples were not considered because only immature specimens or empty valves were found. Consequently, 77 samples from 58 sites were analysed. Whenever possible, ostracod identification was done at the species level based on the morphology of both valves and limbs. Thirty-eight taxa from 20 genera belonging to the families Candonidae, Ilyocyprididae, Cyprididae, and Notodromadidae were recorded. This roughly accounts for one-third of the estimated number of non-marine ostracod species in Italy. Scanning electron microscopy images of valves are provided. The maximum number of species per site was six. The most frequent species were Heterocypris incongruens, Eucypris virens, Pseudocandona pratensis, Cypria ophthalmica, and Tonnacypris lutaria.
    [Show full text]
  • Ostracod Soft-Part Morphology, Dissection and Slide-Preparation
    OSTRACOD SOFT-PART MORPHOLOGY, DISSECTION AND SLIDE-PREPARATION Tadeusz Namiotko 1) and Dan L. Danielopol 2) 1) University of Gdańsk, Department of Genetics, Laboratory of Limnozoology, Gdańsk, Poland 2) Commission for the Stratigraphical & Palaeontological Research of Austria, Austrian Academy of Sciences, c/o Institute of Earth Sciences (Geology & Palaeontology), University of Graz, Austria INTRODUCTION General morphology and terminology of the ostracod appendages with emphasis on the order Podocopida Most commonly used techniques for treating ostracod soft body for taxonomical purposes with optical microscopy General morphology and terminology of the ostracod soft body Terminology of limb morphology after RV ● short compact body with no true segmentation ● faint constriction in the centre marks indistinct boundary between two main parts: - anterior head (= cephalon) - posterior trunk (reduced thorax + abdomen) ● trunk in a few taxa with external traces of postcephalic segments: 4-7 (subclass Myodocopa) 10-11 (subclass Podocopa) head trunk ● up to 8 pairs of appendages (the fewest number of limbs of any crustaceans) General morphology and terminology of the ostracod soft body Antennula A1 in Podocopa 4 pairs of limbs (=appendages) attached to cephalon (untypical for crustaceans) Antenna A2 A1 and A2 1 mm (and the Maxillula eye) are Mandibula Mx1 attached Md to the pre-oral forehead 0.5 mm Md and Mx1 are connected to the hypostome General morphology and terminology of the ostracod soft body Antennula A1 head limbs followed by: - 3
    [Show full text]
  • Taxonomy and Zoogeography of Intertidal Ostracoda (Crustacea) from the Cape Verde Islands (Atlantic Ocean)
    I I BULLETI N DE L'INSTITUT RO YAL DES SCIENCES NATURELLES DE BELGIQUE, BIOLOGIE, 73 : 137-1 59, 2003 BULLETI N VAN HET KON INKLIJK BELGI SCH INSTITUUT VOO R NATUU RWETENSC HAPPE N, BIOLOGIE, 73 : 137-159,2003 Taxonomy and zoogeography of intertidal Ostracoda (Crustacea) from the Cape Verde Islands (Atlantic Ocean) by Karel WOUTERS Abstract The aim of this paper is in the first place to in ventory the ostracod fa una of the Cape Verde Islands, and where possi­ Ostracoda recovered fro m five samples collected in the intertidal bl e, to compare it with other regions, in order to draw some zone of St. Vincent Island (Cape Verde Islands) are studied. These zoogeographical conclusions. comprise thirteen species, belonging to eleven genera. Two species are new, three are reported for th e first time since their ori gin al de­ scri pti on in the 19'" century, and three are named in open nomencla­ Material and methods ture. Four species had already been descri bed from elsewhere, two from the tropical realm, and two fro m th e Mediterranean, and one The materi al used in this study was collected by my col­ species had previously been described from the Cape Verde Islands by the present author. Their taxonomy and zoogeography are brie fl y league Thierry BACKELJAU in February 1996, on Ilha de Sao discussed. Vi cente (= St. Vincent), of the Cape Verde Islands. This ar­ chipelago is situated in the A tl antic Ocean, about 850 km Key-words: Ostracoda, taxonomy, Cape Verde Islands, west of Senegal, at ca 16° N and 24° W.
    [Show full text]