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Registros recuperados: 21
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A seasonally varying biotope at Signy Island, Antarctic: implications for meiofaunal structure OMA
Vanhove, S.; Beghyn, M.; Van Gansbeke, D.; Bullough, L.W.; Vincx, M..
Under the typical high-latitude conditions of temperature, productivity and settlement of chlorophyll and phaeophytin to the sediment, many benthic organisms in the Antarctic show strong seasonal variation. Although meiofauna comprise an important component of the southpolar benthic ecosystem, our knowledge of them is limited. The metazoan meiofauna and the surrounding sediments were studied fortnightly for 18 mo in a shallow bay at Signy Island (Factory Cove, South Orkneys, Antarctica) to test whether and how the temporal variability of the environment influenced meiobenthos dynamics. By examination of the distribution of the abundance and biomass of the total community, the density of higher taxonomic groups, and of individual dominant nematode genera...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos; Biomass; Population density; Seasonal variations; Sediment analysis; Trophic relationships; Copepoda [copepods]; Nematoda [Nematodes]; Ostracoda.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6138
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Biochemical substrates expenses and respiration at short-term starvation of marine planktonic animals ArchiMer
Pavlova, Z; Morozova, A; Gaudy, R; Shchepkin, V.
One of the most important indices at estimation of productivity characteristics of hydrobionts is oxygen consumed in the process of respiration. Usually respiration (standard metabolism) is measured in small-volume respirometres (30-50 ml) where animals' activity is considerably restricted. It may underestimate respiration in comparison to natural one. Therefore respirometres of larger volume were used. Simultaneously under same conditions we tried to estimate energy requirements by expense of main biochemical components of organic matter (lipids, protein, glycogen). Results were used to calculate energy budget and to compare energy expenditures, measured according to consumed oxygen and tissue substrates expense.
Tipo: Text Palavras-chave: Euchirella curticauda; Pleuromamma abdominalis; Scolecithrix danae; Ostracoda; Copepoda; Starvation; Oxygen consumption; Biochemical composition; Zooplankton; Energy budget; Respiration; Biological production.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1520.pdf
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Crustacean biodiversity through the marine fossil record Naturalis
Sepkoski Jr., J. John.
Approximately 2,600 genera of marine crustaceans have been recognized in the fossil record, and crustaceans constitute the major component of marine arthropod diversity from the mid-Paleozoic to the Recent. Despite problems of sporadic fossil preservation and/or taxonomic ambiguity, some general statements can be made about the history of crustacean biodiversity, based on global taxonomic data bases. Ostracodes were the first major group to radiate, attaining high diversity during the Ordovician Period with other members of the Paleozoic evolutionary fauna; rates of extinction and responses to mass extinctions were also similar to those of groups within the Paleozoic fauna. Malacostracans and barnacles (cirripedes), the two other crustacean groups with...
Tipo: Article / Letter to the editor Palavras-chave: Crustacean biodiversity; Marine fossil record; Extinction rates; Ostracoda; Malacostraca; Cirripedia.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/534399
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Epi-bathyal ostracod assemblage in Holocene Rhone deltaic sediments (Gulf of Lions, NW Mediterranean) and their palaeoecological implications ArchiMer
Fanget, Anne-sophie; Bassetti, Maria Angela; Berne, Serge; Arnaud, Mireille.
Since the Last Glacial Maximum, the Rhone River, which is the most important source of freshwater and sediment to the western Mediterranean Sea, migrated in a north-westward direction during the rapid Deglacial and Early Holocene sea-level rise. During the phase of global high sea-level (Middle and Late Holocene), an overall eastward migration of the Rhone outlet, under natural and/or human influence, is recorded through several sediment accumulations confined along the inner shelf in the form of deltaic lobes. These lobes that make up the whole Rhone subaqueous delta represent very expanded sedimentary archives of the Rhone Holocene history. In this paper, using three long piston cores retrieved from the most recent Bras de Fer (RHS-KS55) and Roustan...
Tipo: Text Palavras-chave: Ostracodes; Delta sous-marin; Paléoécologie; Holocène; Méditerranée occidentale; Ostracoda; Subaqueous delta; Palaeoecology; Holocene; Western Mediterranean..
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00217/32810/31253.pdf
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Eusarsiella bedoyai (Myodocopida, Sarsiellidae), a new ostracode species from a marine lava cave in the Canary Islands Naturalis
Baltanás, Angel.
A new species of the ostracode genus Eusarsiella (Myodocopida, Sarsiellidae) is described from a marine lava tube in Lanzarote (Canary Islands) and compared with other species known to occur in the same geographical area. Eusarsiella bedoyai n. sp. is the second species in that genus described from anchialine caves. Its importance in determining the origin of the stygobiont fauna is briefly discussed.
Tipo: Article / Letter to the editor Palavras-chave: Taxonomy; Ostracoda; Sarsiellidae; Eusarsiella; Anchialine cave fauna; Canary Islands.
Ano: 1992 URL: http://www.repository.naturalis.nl/record/504112
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Foraminíferos y ostrácodos del Pleistoceno tardío (Mar Chiquita, provincia de Buenos Aires, Argentina) Ameghiniana
Ferrero,Laura.
Sobre la base del estudio de foraminíferos y ostrácodos, se describe la evolución de ambientes marino- costeros al sudeste de la provincia de Buenos Aires afectados por las variaciones del nivel del mar durante el Pleistoceno tardío. Fueron estudiadas dos perforaciones realizadas al sur de la laguna Mar Chiquita. En las secciones inferiores de las perforaciones (A y B) se registran ambientes marinos marginales que pueden ser asignados a la Formación Canal 5 correlacionable con el último máximo interglacial (subestadio isotópico 5e). En los niveles fértiles inferiores de la perforadión A y en toda la sección B las asociaciones de foraminíferos, dominadas por Ammonia beccarii (Linné), permiten inferir ambientes marinos litorales a lagunas costeras. Las...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Foraminifera; Ostracoda; Pleistoceno tardío; Transgresión marina; Paleoambientes.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000400005
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La distribution des assemblages d’ostracodes et de foraminifères benthiques le long des derniers 550 ka dans le bassin Est-Corse, Méditerranée occidentale : une reconstitution paléo-environnementale ArchiMer
Angue Minto’o, Charlie Morelle; Bassetti, Maria-angela; Toucanne, Samuel; Jouet, Gwenael.
The study of Quaternary sediments covering the last 550 kyr from the borehole GDEC-4-2, East-Corsica basin, was performed through the study of benthic meiofaunal assemblages (ostracoda and benthic foraminifera) whose distribution responds to climate changes, and glacial–interglacial variability in particular. The interglacial ostracod group is mainly composed of the Argilloecia acuminata, Cytheropteron alatum, Henryhowella sp., Polycope sp. and Cytherella sp., which indicate an enhanced surface productivity and possibly high bottom water temperature during these warm intervals. Benthic foraminifera, such as Hoeglundina elegans, Sigmoilopsis schlumbergeri, Bigenerina nodosaria and Hyalinea balthica are predominant during interglacial periods and also show...
Tipo: Text Palavras-chave: Est-Corse; Ostracode; Foraminifère benthique; Groupe allochtone; East-Corsica; Ostracoda; Benthic foraminifera; Allochthonous group.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00313/42426/42030.pdf
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Late Pleistocene to Recent ostracod assemblages from the western Black Sea ArchiMer
Boomer, Ian; Guichard, Francois; Lericolais, Gilles.
During the last glacial phase the Black Sea basin was isolated from the world's oceans due to the lowering of global sea-levels. As sea-levels rose during the latest glacial and early Holocene period, the Black Sea was once again connected to the eastern Mediterranean via the Dardanelles-Marmara-Bosporus seaway. In recent years, trace element and stable isotope analyses of ostracod assemblages have yielded important details regarding the hydrological evolution of the Black Sea during these events. Despite this focus on the geochemical signatures of the ostracods, little if any attention has been paid to the taxonomic composition of the ostracod assemblages themselves and there are notably few publications on the sub-littoral fauna of this important water...
Tipo: Text Palavras-chave: Ponto-Caspian; Black Sea; Ostracoda; Pleistocene; Holocene.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00025/13646/10887.pdf
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Microfossils in micrites from Serra da Bodoquena (MS), Brazil: taxonomy and paleoenvironmental implications Anais da ABC (AABC)
Utida,Giselle; Petri,Setembrino; Oliveira,Emiliano C.; Boggiani,Paulo C..
Microfossils present in Quaternary micrites from Serra da Bodoquena, Mato Grosso do Sul State, Brazil, are here described for the first time. The studied taxa are: a) ostracods: Candona sp., Candonopsis sp., Cyclocypris sp., Cypria sp., Cypridopsis sp., Notodromas sp., Ilyocypris sp., Cyprideis sp., Wolburgiopsis cf. chinamuertensis (Musacchio 1970), Darwinula sp. and 5 morphotypes; b) microgastropod Acrobis sp., and c) Characeae remains and gyrogonites Chara sp.. The presence of these microfossils suggests clear-water shallow lacustrine paleoenvironments and the presence of aquatic vegetation. Similarities between microfossils and the living taxa suggest possible Holocene ages for these deposits, which is in accordance with previous C14 dates.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Micrite; Characeae; Lacustrine sediments; Ostracoda; Serra da Bodoquena.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200003
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On Pseudocypridopsis n.gen., with a redescription of Pseudocypridopsis clathrata (Klie, 1936) and a first description of the male (Ostracoda, Cypridopsinae) Naturalis
Karanovic, Ivana.
Pseudocypridopsis n. gen. is described to comprise the species Pseudocypridopsis clathrata (Klie, 1936) found, until now, only in Skadar Valley (Montenegro, SE Europe). This genus is characterised by the absence of the furca in both female and male. In this paper the male is described for the first time. The taxonomic position of the new genus within the subfamily Cypridopsinae is discussed.
Tipo: Article / Letter to the editor Palavras-chave: Ostracoda; Cypridopsinae; Taxonomy; Montenegro.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/505461
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On the genus Strandesia Stuhlmann, 1888 (Crustacea, Ostracoda, Cyprididae) with description of Strandesia kimberleyi n. sp. and a key to the extant species of the genus Naturalis
Karanovic, I..
Strandesia kimberleyi n. sp. is described from subterranean waters of the Kimberley Region (Western Australia). It belongs to the group of relatively elongated Strandesia Stuhlmann, 1888 species, with no projection on the carapace and with a finely serrated posterior margin of the CR and its claws. The new species is characterized by the asymmetrical valves, elongated terminal segment of the maxillular palp, and the presence of a sensory organ antero-proximally on the first segment of the antennula. This is the first time that this organ is reported in the genus Strandesia. Strandesia purpurascens (Brady, 1886) is redescribed, while for S. variegata (Sars, 1901) and S. obliqua (Brady, 1868) some additional notes on the morphology are provided. A key to...
Tipo: Article / Letter to the editor Palavras-chave: Taxonomy; Ostracoda; Cyprididae; Strandesia; Key; 42.74.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/214342
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Ostracodes (Crustacea) from Cananéia-Iguape estuarine/lagoon system and geographical distribution of the mixohaline assemblages in southern and southeastern Brazil Iheringia, Sér. Zool.
Coimbra,João C.; Carreño,Ana L.; Geraque,Eduardo A.; Eichler,Beatriz B..
The ostracode assemblages from Cananéia-Iguape estuarine/lagoon system (southernmost State of São Paulo) are here discussed in detail for the first time. Thirty-four sites, approximately 1 km equidistant, were sampled along the system, including the Cananéia Sea, Pequeno Sea, Cubatão Sea, Ribeira de Iguape River and Itapitangui River. The ostracodes throughout this area have poor assemblages, with a total of 662 specimens of dead and living organisms. The majority of the ostracode fauna is composed of euryhaline species, as follows: Cyprideis multidentata Hartmann, 1955 (174 specimens), Minicythere heinii Ornellas, 1974 (54 specimens), Tanella gracilis Kingma, 1948 (96 specimens) and Whatleyella sanguinettiae Coimbra, Carreño & Ferron, 1994 (226...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ostracoda; Geographical distribution; Ecology; Marginal environments; Brazil.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000300010
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Ostrácodos (Crustacea, Ostracoda) y carófitos (Chlorophyta, Charales) de la Formación Desencuentro (Mioceno superior), provincia de La Rioja, Argentina Ameghiniana
Cusminsky,Gabriela; García,Adriana; Herbst,Rafael.
Se describen e ilustran los ostrácodos y carófitos de la Formación Desencuentro, provincia de La Rioja, Argentina. La asociación muestra baja diversidad con seis taxones de ostrácodos: Eucypris sp., Darwinula sp., Cyamocytheridea sp., Cyprideis salebrosa hartmanni Ramírez, Limnocythere aff. L. reticulata Sharpe, Limnocythere sp., y dos especies de carófitos: Chara zeylanica s. l. Klein ex Willdenow y Chara musacchioi García sp. nov. El hallazgo de veinte girogonites bien preservados de Chara musacchioi permitió evaluar su variabilidad morfológica, establecer su relación con la especie actual Chara hornemannii Wallman, y arribar a la conclusión de que se trata de una nueva especie. Estos taxones indican un ambiente acuático de aguas tranquilas oligohalinas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ostracoda; Charales; Paleolimnología; Mioceno Superior; Argentina.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000200006
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Paleontología de la Formación Lagarcito (Cretácico inferior) en la provincia de San Juan, Argentina Ameghiniana
Prámparo,Mercedes B.; Ballent,Sara C.; Gallego,Oscar F.; Milana,Juan P..
Se presentan los primeros registros paleontológicos de la Formación Lagarcito (Albiano) provenientes de la sección La Yesera Sur, sobre la ladera oriental de la sierra de Guayaguas, en el sudeste de la provincia de San Juan, en el centro-oeste de Argentina. Varios episodios lacustres se detectaron a lo largo del perfil, pero sólo en tres de ellos el contenido paleontológico y palinológico resultó abundante. Se describen e ilustran ocho especies de algas clorofíceas, tres de conchóstracos y once de ostrácodos no marinos. La asociación es indicadora de un ambiente lacustre somero, con buena disponibilidad de nutrientes en una primera etapa y alta evaporación, demostrado por la presencia de yeso interestratificado hacia la parte superior de cada episodio...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Algas clorofíceas; Conchostraca; Ostracoda; Cretácico inferior; San Juan; Argentina.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000100006
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Redescription and morphological variability of <i>Darwinula stevensoni</i> (Brady & Robertson, 1870) (Crustacea, Ostracoda) OMA
Rossetti, G.; Martens, K..
The species <i>Darwinula stevensoni</i> is extensively redescribed. Morphological variability of both valves and soft parts is assessed in several geographical and climatically distant populations and is found to be minimal or non-existant. Only size significantly varies between populations and this can be attributed to the differences in ambient temperatures during the larval development. Number and shape of muscle scars also vary, but this both within and between populations. Valve shape and chaetotaxy of limbs are remarkably constant. One female from an Italian population has aberrant Mx2-palps, but this specimen is considered a teratological case. Earlier records of males of <i>D. stevensoni</i> and the taxonomic position of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal morphology; Taxonomy; Darwinula stevensoni; Ostracoda.
Ano: 1996 URL: http://www.vliz.be/imisdocs/publications/303568.pdf
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Taxonomia e distribuição de Actinocythereis brasiliensis sp. nov. (Podocopida, Trachyleberididae) na plataforma continental brasileira Iheringia, Sér. Zool.
Machado,Cláudia P.; Drozinski,Núscia G. S..
A new species is described, Actinocythereis brasiliensis, from the southern Brazilian continental shelf. It is based on the analysis of 766 samples collected by oceanographical projects. The geographical distribution of this species has revealed its preference by the cold waters and terrigenous sediments and, has a bathymetric distribution between 22 and 164 m but, being concentrated in the shallower waters (< 60 m).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazilian Continental Shelf; Ostracoda; Crustacea; Taxonomy; Zoogeography.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212002000300001
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Taxonomic revision of the recent and Holocene representatives of the Family Darwinulidae (Crustacea, Ostracoda), with a description of three new genera OMA
Rossetti, G.; Martens, K..
The Darwinulidae, the only surviving family of the superfamily Darwinuloidea, are revised and 28 extant species are retained. Twenty-six species (2 of which as yet formally undescribed) are allocated to 5 genera, 3 of which are here described as new; 2 species have an uncertain position within the family because of their insufficient original description are listed here as <i>species inquirendae</i>. New genera are characterised on combinations of soft part and valve characters, but the chaetotaxy of the limbs seems most conservative and most suitable the identification of genera. <i>Darwinula</i> s.s. and <i>Microdarwinula</i> are, with regard to recent species, monospecific.<i>Alicenula</i> nov. gen. is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal fossils; Holocene; New genera; Phylogeny; Taxonomy; Alicenula; Darwinulidae; Ostracoda; Penthesilenula; Vestalenula.
Ano: 1998 URL: http://www.vliz.be/imisdocs/publications/266663.pdf
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The Family Thaerocytheridae Hazel, 1967 (Ostracoda) from the Southern Brazilian Continental Shelf Ameghiniana
Feijó Ramos,Maria Inês; Coimbra,João Carlos; Whatley,Robin.
Of a total fauna of 95 species of benthic Ostracoda recovered from dry sediments from the southern Brazilian continental shelf, 8% belong to the Family Thaerocytheridae. Six species assigned to this family are discussed and figured in this paper; four of these, Bradleya pseudonormani, B. kaesleri, Muellerina cribrosa and Quadracythere nealei are described as new, while Brasilicythere reticulispinosa and Quadracythere eichlerae were described for the first time from the Quaternary of Pelotas Basin, in southern Brazil. Most of these species are restricted to the southern part of the Southwest Atlantic Ocean, and their geographical distribution ranges from the southern Brazilian continental shelf, in Rio de Janeiro State (21ºS), to the Argentinian continental...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ostracoda; Thaerocytheridae; Recent; Brazilian Continental Shelf.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000200007
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Three new genera and nine new species of the subfamily Candoninae (Crustacea, Ostracoda, Podocopida) from the Pilbara region (Western Australia) Naturalis
Karanovic, Ivana; Marmonier, Pierre.
Three new ostracod genera: Humphreyscandona n. gen., Pilbaracandona n. gen., and Notacandona n. gen., and nine new species are described from subterranean waters of the Pilbara Region, Western Australia. They belong to the subfamily Candoninae of the order Podocopida, and are characterized by a 5-segmented antennula and ornamented carapace. Humphreyscandona n. gen. contains five species, all with reduced posterior furcal claw and prominent external lobe on hemipenis. The other new genera each contain two species. Pilbaracandona n. gen. is also characterized by a reduced posterior furcal claw, but can be separated from the previous genus by the chaetotaxy of the antennula, mandibula, and general appearance of the hemipenis. Notacandona n. gen. is separated...
Tipo: Article / Letter to the editor Palavras-chave: Taxonomy; Ostracoda; Candoninae; Australia; Taxonomie; Ostracoda; Candoninae; Australie.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/505207
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Type specimens of Maastrichtian fossils in the National Museum of Natural History, Leiden Naturalis
Leloux, J..
The type specimens of Maastrichtian invertebrate fossils from Limburg, The Netherlands, present in the National Museum of Natural History, Leiden, are listed. The Upper Cretaceous plant type specimens from Limburg of Miquel that were once part of the Staring collection present in the Palaeobotanical Museum of the Utrecht University are also included. Specimens of species described by Bosquet are also listed, since they possibly include type material. Short biographies of some of the important collectors and investigators are presented.
Tipo: Article / Letter to the editor Palavras-chave: Foraminifera; Scleractinia; Bivalvia; Ammonoidea; Nautiloidea; Asterozoa; Fossil plants; Ostracoda; Brachiopoda; Cirripedia; Staring Collection; 38.22.
Ano: 2002 URL: http://www.repository.naturalis.nl/record/216192
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