Papers by Cristianini Trescastro Bergue
The "Bradleya problem", the spearhead of ostracod-based paleoceanography - contribution and outcomes
Micropaleontology, 2022
Since their origin in the Ordovician, ostracods have radiated to several different aquatic and ev... more Since their origin in the Ordovician, ostracods have radiated to several different aquatic and even semiterrestrial environments, evolving under influence of both extrinsic (ecological) and intrinsic (genetic) factors. The deep ocean does not constitute an exception to these controls, no matter how different the concept of deep-sea might be among students of Paleozoic and post-Paleozoic ostracods. Once integrated to the bathybic biotas (i.e., from bathyal to abyssal depths, including guyots), ostracods followed a particular pattern of diversification and dispersal in response to climatic and tectonic events.
Filosofia e História da Biologia, 2019
Research on deep-sea ostracods -hereafter referred to as bathybic -and its contribution to the un... more Research on deep-sea ostracods -hereafter referred to as bathybic -and its contribution to the understanding of past oceans is the theme of this paper. Its development is an outcome of the strategic expansion of oceanography by European nations during the 19 th century and subsequent improvements in deep-sea sampling technology, during the 20 th century. The bathybic ostracodology has revealed unusual ecological and taxonomic patterns over the last 140 years. Since its full-establishment by the end of the 1960s, the field has followed three main paths: (i) the faunal approach; (ii) the geochemical approach, and (iii) the morphometric approach. Advancements in the knowledge on recent and fossil assemblages expanded the use of bathybic ostracods as hydrological markers, enhancing their application in the study of changes in the oceans through time. In spite of limitations imposed by the inadequate taxonomy of some genera, the astounding diversity, and the long evolutionary history of ostracods make them critical organisms for the understanding of deep oceans. This paper reviews some crucial studies on bathybic assemblages, since the pioneering work by George Stewardson Brady, with an emphasis on their contribution to the development of ostracodology and oceanography.
Holocene deep-sea ostracods of the São Paulo Ridge, São Paulo Plateau, and Rio Grande Rise, southwestern Atlantic Ocean
Marine Biodiversity
Research on deep-sea ostracods -hereafter referred to as bathybic -and its contribution to the un... more Research on deep-sea ostracods -hereafter referred to as bathybic -and its contribution to the understanding of past oceans is the theme of this paper. Its development is an outcome of the strategic expansion of oceanography by European nations during the 19 th century and subsequent improvements in deep-sea sampling technology, during the 20 th century. The bathybic ostracodology has revealed unusual ecological and taxonomic patterns over the last 140 years. Since its full-establishment by the end of the 1960s, the field has followed three main paths: (i) the faunal approach; (ii) the geochemical approach, and (iii) the morphometric approach. Advancements in the knowledge on recent and fossil assemblages expanded the use of bathybic ostracods as hydrological markers, enhancing their application in the study of changes in the oceans through time. In spite of limitations imposed by the inadequate taxonomy of some genera, the astounding diversity, and the long evolutionary history of ostracods make them critical organisms for the understanding of deep oceans. This paper reviews some crucial studies on bathybic assemblages, since the pioneering work by George Stewardson Brady, with an emphasis on their contribution to the development of ostracodology and oceanography.
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil
Global and Planetary Change, 2021
Abstract The tectonic evolution of the Equatorial Atlantic Gateway (EAG) throughout the early Cre... more Abstract The tectonic evolution of the Equatorial Atlantic Gateway (EAG) throughout the early Cretaceous had global implications. This break-up of western Gondwana has played a significant role in causing, or amplifying, environmental changes due to its influence on ocean chemistry, nutrient distribution, water mass circulation, and bottom waters ventilation. However, the timing of its establishment and the areal extent of this oceanic gateway is still poorly constrained. Marine settings were recorded by the black shales of the Romualdo Formation (Late Aptian), Araripe Basin - Northeastern Brazil, which are known worldwide for their fossil content and importance for paleogeographic reconstructions of Gondwana. In this contribution, we present multiproxy analyses, combining macro- and micropaleontological, as well as sediment compositional data to evaluate paleoenvironmental conditions during the deposition of sedimentary strata assigned to the Romualdo Formation. We investigate the ~100-m-thick succession of the Sobradinho Section, which is the most complete exposure of the Romualdo Formation. Increased abundances of ostracods, the occurrence of agglutinated benthic foraminifera, bakevelliid bivalves, and cassiopid gastropods coincide with levels of relatively high paleosalinity estimates based on the Sr/Ba (strontium/barium) and S/TOC (sulfur/total organic carbon) ratios. These levels correspond to a transgressive system tract and the lower interval of a highstand systems tract. Throughout the section, black shales occur intercalated with sparse sandstone and calcarenite levels, and the deposition of these black shales is associated with dysoxic to anoxic bottom water conditions, as suggested by the V/Cr (vanadium/chrome) ratio. The occurrence of stagnant bottom water conditions may explain the mass mortality of ostracods in the lower interval of the succession. The upper part of the highstand system tract in the studied section was deposited in coastal environments and is characterized by coarser-grained siliciclastic-dominated facies (high log(Zr/Rb) (zirconium/rubidium) ratio), as well as increased phytoclasts and terrigenous (high magnetic susceptibility) contents.
Cytheroidea Baird 1850
Superfamily CYTHEROIDEA Baird, 1850 FAMILY Copytidae fam. nov. Coimbra, Bergue & Ramos Type-genus... more Superfamily CYTHEROIDEA Baird, 1850 FAMILY Copytidae fam. nov. Coimbra, Bergue & Ramos Type-genus. <i>Copytus</i> Skogsberg, 1939, by present designation. <b>Diagnosis.</b> Carapace elongate, barely calcified in most species. Dorsal and ventral margins parallel or subparallel, posterior margin rounded, anterior margin rounded or protruded in the ventral half. Surface smooth or ornamented by striae and/or ribs, more rarely partially gently reticulate. Normal pore canals simple, small and scattered, usually poorly visible. Inner lamella wide, more developed anteriorly, in some species narrow ventrally. A conspicuous vestibule occurs at each end margin, larger anteriorly. Marginal pore canals simple and straight, in some species some false. Hinge very long, adont, more rarely weakly lophodont, without terminal teeth. Central muscle scars often weakly developed. Adductors a rounded group of four somewhat ovate or subtriangular imprints. Frontal scar usually ovate...
Journal of Natural History, 2015
Ephippia of Cladocera (Crustacea: Branchiopoda) are found in the Oligocene deposits of Tremembé F... more Ephippia of Cladocera (Crustacea: Branchiopoda) are found in the Oligocene deposits of Tremembé Formation (Taubaté Basin, Southeast Brazil). Thirty specimens from a short stratigraphic interval of a 115-m section of a core drilled in Taubaté city, São Paulo state, have been studied. Based on the morphology, we assumed that they might belong to two diferent species of Daphnia (Ctenodaphnia) which lived either in the Tremembé palaeolake or in some surrounding temporary waters. Our find represents the oldest record of fossil ephippia in South America and the second record of Daphnia (Ctenodaphnia) in the former Gondwana. A tentative palaeolimnological interpretation is proposed based on the ephippia occurrences, allied to ostracod and lithological data.
Iheringia Serie Zoologia, Sep 1, 2003
Ostracods were collected on Sargassum sp. from the littoral of São Sebastião, São Paulo State, so... more Ostracods were collected on Sargassum sp. from the littoral of São Sebastião, São Paulo State, southeastern Brazil. A new species, Aurila ornellasae, is illustrated and described based on a population with various instars and adult specimens. This is the first living species of this genus described from Brazil. A brief discussion on the systematics of the genus Aurila Pokorný, 1955 and its allied genera is presented.
Revista Brasileira de Paleontologia
New ostracod species are described for Middle to Upper Permian (Guadalupian) rocks of the Teresin... more New ostracod species are described for Middle to Upper Permian (Guadalupian) rocks of the Teresina Formation, Paraná Basin, from two localities in the São Paulo State, southwestern Brazil: Xavante Dam and Pau Preto Quarry. Paranacythere nigripallus gen. nov. and sp. nov., Velatomorpha xavante sp. nov., and Velatomorpha pseudoaltilis sp. nov. are herein described. The association Velatomorpha–Paranacythere is proposed as typical of Permian mixohaline environments of the Teresina Formation, and is the most abundant in the two studied localities. Paranacythere nigripallus gen. nov. and sp. nov. is proposed to accommodate a very abundant species with typically cytheroidean characteristics, and tentatively ascribed to the family Cytheruridae. Some ecological remarks are presented based on ostracod population age structure, biostratinomy and taxonomic composition of assemblages. The diagnosis of Velatomorpha Tibert & Dewey is emended. Keywords: evolution, marginal marine environments, pal...
Brazilian Journal of Geology
Benthic foraminifera, ostracods and pteropods are reliable paleoenvironmental indicators in Quate... more Benthic foraminifera, ostracods and pteropods are reliable paleoenvironmental indicators in Quaternary deposits. However, in the Ceará Basin, on the Brazilian Equatorial Margin, these microfossils are poorly studied. This paper investigates environmental changes during the Pleistocene-Holocene transition in the Icaraí subbasin based on micropaleontological analysis of the core ANP 1011. Seventy-four taxa of benthic foraminifera, represented predominantly by Globocassidulina, Uvigerina, Pyrgo and Melonis, have been identified. The ostracod assemblages are composed mainly by the families Macrocyprididae, Cytheruridae, Trachyleberididae, Pontocyprididae and Krithidae, of which the genus Krithe was the most abundant. The composition of the ostracod assemblages identified in this study area differs somewhat from other regions of the Brazilian Margin. The assemblages of foraminifera and ostracod characterize a typical bathyal paleoenvironment. The occurrence of pteropods and dominance of epifaunal foraminifera taxa, mainly Pyrgo sp. and Miliolinella sp. in the lower portion of the core (Pleistocene), indicates higher phytodetritus input and oxygen concentration. A conspicuous environmental change was observed in the upper portion of the core, which corresponds to the Holocene, where the increase of infaunal foraminifera (e.g., Uvigerina, Globocassidulina and Melonis) suggests reduction in the organic matter input and, probably, increased bacterial density and depletion in dissolved oxygen in the sediment.
Revista Brasileira de Paleontologia
A micropaleontological analysis on 15 beachrock samples from the Northern sector of Rio Grande do... more A micropaleontological analysis on 15 beachrock samples from the Northern sector of Rio Grande do Sul Coastal Plain (RSCP ), southern Brazil , revealed a relatively diverse and well-preserved ostracod assemblage composed of 16 species , including Cyprideis multidentata Hartmann, Callistocythere nucleoperiscum Whatley et al., Cytheretta punctata Sanguinetti, Caudites ohmerti Coimbra & Ornellas , and Argenticytheretta levipunctata Sanguinetti et al. Eleven ostracod species are left in open nomenclature or tentatively identified . Besides ostracods , some foraminifers , echinoderm spines, and fish remains (teeth) were also recovered ; however , the scarcity of specimens or poor preservation precluded identification at species level. Based on the Ostracoda taxonomic composition it is proposed that the beachrocks characterize environmentally condensed assemblages . This preliminary study reveals the importance and potentiality of micropaleontology for understanding the processes involved...
The Permian podocopids (Crustacea: Ostracoda) from the Serra Alta and Teresina formations, Parana Basin, Brazil
Micropaleontology
Twenty-five species of Podocopida are reported in seven localities in the Sao Paulo State, Brazil... more Twenty-five species of Podocopida are reported in seven localities in the Sao Paulo State, Brazil, corresponding to the Serra Alta and Teresina formations (Middle to Upper Permian). The specimens are mostly preserved as steinkerns (internal molds), except some carbonitids and cytherocopines which are predominantly recrystallized. The results indicate marginal marine environments influenced by influxes of nonmarine waters, as suggested by the occurrence of Velatomorpha, Gutschickia, Carbonita and Darwinuloidea. Velatomorpha rochacamposi sp. nov. is described, and evidences of predation are reported for the first time in Paleozoic ostracods. This study contributes to the understanding of the ecology and evolution of nonmarine ostracods during the Late Paleozoic.
Brazilian Journal of Geology, 2021
Bathybic ostracods (i.e., bathyal and abyssal assemblages) are important indicators of temperatur... more Bathybic ostracods (i.e., bathyal and abyssal assemblages) are important indicators of temperature and productivity changes of Cenozoic marine ecosystems. The present work presents the first study on Quaternary ostracods of the Camamu Basin, off the state of Bahia, northeastern Brazilian continental margin. The analysis of 59 samples from the piston-core CMU 14 (14°24'S, 38°49'W; 965 m water depth), revealed rich and abundant assemblages. The 14 C accelerator mass spectrometry (AMS) dating indicates that the studied interval covers the last 108 kyr, corresponding to the oxygen stable isotope stages (MIS) 5 to 1. Comparison with data from previous publications allowed discernment of three groups of ostracod species in CMU 14: Pandemic Group of species registered in more than one oceanic basin; Atlantic/Mediterranean Group of species restricted to the Atlantic Ocean and Mediterranean; and Brazilian Group of species restricted to the Brazilian continental margin). Four new species are herein proposed: Cytherella pindoramensis sp. nov., Ambocythere amadoi sp. nov., Pseudobosquetina pucketti sp. nov., and Bythoceratina bonaterrae sp. nov. Ostracod occurrences reveal the influence of glacial/interglacial cycles on assemblages composition. Interglacial stages 5 and 1 in the Camamu Basin are characterized by the association Bythocypris affinis-Cytherella pindoramensis sp. nov.-Cytheropteron perlaria-Bradleya dictyon; glacial stages (i.e., 2 to 4) register decreased diversity, possibly due to lower oceanic productivity.
Iconography : Taxonomy and climatic zonation of the Late Quaternary bathyal ostracods from the Campos Basin, Brazil
The Paleocene-Oligocene Ostracodes from DSDP Site 329 (Falkland Plateau): Taxonomy and Paleozoogeographical Remarks
Paleontological Research, 2012
ABSTRACT This article presents a taxonomic study of the Late Paleocene-Oligocene ostracode faunas... more ABSTRACT This article presents a taxonomic study of the Late Paleocene-Oligocene ostracode faunas of DSDP (Deep Sea Drilling Project) Site 329, Falkland Plateau. Six species were identified at specific level: Actinocythereis orientalis Guernet, Dutoitella mimica Dingle, Legitimocythere presequenta (Benson), Anebocythereis hostizea (Hornibrook), Poseidonamicus pseudorobustus Coles and Whatley, and Abyssocythere diagrenona (Guernet). Nineteen species were left in open nomenclature, one of them as gen. et sp. indet. Krithe, Cytherella, Cytherelloidea and Pennyella (two species each) are the richest genera. Three faunal groups are identified with characteristic associations, as follows: the Paleocene Fauna—PAF (A. hostizea-Abyssocythere diagrenona-Cytheropteron sp.-D. mimica), the Eocene Fauna-EOF (A. orientalis—Cytherelloidea sp. 2—Pennyella spp.) and the Oligocene Fauna—OLF (P. pseudorobustus—Ambocythere sp.—Krithe morkhoveni lamellalata). Preservational aspects linked to carapace dissolution and their relation to the paleoceanographical context are briefly discussed.
Unveiling the Permian and Triassic record of drilling predation on ostracods
Marine Micropaleontology, 2022
Revista Brasileira de Paleontologia, 2021
Holocene ostracods from a core obtained in the Itapeva Lake, Rio Grande do Sul coastal plain, are... more Holocene ostracods from a core obtained in the Itapeva Lake, Rio Grande do Sul coastal plain, are studied in this paper. Twenty-six species belonging to 22 genera and 13 families were registered in nine samples analyzed, two of them new: Cytherella eros sp. nov. and Loxoconcha itapevensis sp. nov. The taxonomic composition of the assemblages varies along the core, being Cyprideis multidentataHartmann the most abundant and frequent species (273 specimens), followed by Cytheretta punctata Sanguinetti (56 specimens) and L.itapevensis sp. nov. (51 specimens). Variation in richness and diversity observed along the core probably results from sedimentary and hydrological changes during the evolution of the Itapeva Lake. The results obtained in this work reinforce the importance of ostracods in the study of coastal paleoenvironments. Keywords: barrier-lagoon system, biostratinomy, micropaleontology, Quaternary.
Boletim do Museu Paraense Emílio Goeldi, Mar 19, 2021
Resumo: A micropaleontologia é uma importante aliada à pesquisa paleoceanográfica e paleoclimátic... more Resumo: A micropaleontologia é uma importante aliada à pesquisa paleoceanográfica e paleoclimática, contribuindo para o estudo de parâmetros, como taxas de sedimentação, variações do nível relativo dos oceanos e mudanças hidrológicas (circulação, temperatura, produtividade e salinidade, por exemplo). Este artigo de revisão objetiva apresentar algumas potencialidades e limitações de três importantes grupos de microfósseis calcários: nanofósseis, foraminíferos e ostracodes. Abordagens envolvendo a composição de espécies e geoquímica nestes grupos, no Cretáceo e Cenozóico, são aqui discutidas com base em estudos recentes e, sempre que possível, com exemplos de pesquisas desenvolvidas no Brasil.
Abordagens faunísticas e geoquímicas em microfósseis calcários e suas aplicações à paleoceanografia e paleoclimatologia The faunal and geochemical approaches in the calcareous microfossils and their applications to the palaeoceanography and palaeoclimatology
Bathyal Ostracods from the Upper Pleistocene of the Rio Grande Cone, Pelotas Basin, Brazil
Revue de Micropaléontologie, 2021
Quaternary deep-sea ostracods supply invaluable data for the understanding of both hydrological a... more Quaternary deep-sea ostracods supply invaluable data for the understanding of both hydrological and sedimentary processes in the continental slope. A huge portion of western South Atlantic bathyal regions is still poorly explored with respect to deep-sea ostracod research. This article contributes to the study of the assemblage ostracod of the Upper Pleistocene of five piston cores recovered in the Cone of Rio Grande, Pelotas Basin, Brazil. Taxonomic analysis revealed 21 species belonging to 13 genera:
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Papers by Cristianini Trescastro Bergue