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Showing 1 to 20 of 42 for “"Ostracods"”.
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Palaeogene ostracods from the South African continental shelf
92 cytheracean species, representing 44 genera are recorded from the Palaeogene Agulhas Bank and west coast margin of South Africa. 11 genera and 3 species are common with the Upper Cretaceous faunas. 12 genera (18 species) are left in open nomenclature. The following genera are represented:- …
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High-Resolution Event Stratigraphy of Ostracods in the Ozan Formation of Texas and Arkansas
… Southwest AR which is richly fossiliferous in ostracods. Little research has been published on the Ozan Formation and even less dealing with Ozan ostracods. Additionally, correlation of Upper Cretaceous units between Texas and AR is controversial due to the general lack of good exposures in …
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The holocene ostracods of the Agulhas Bank, South Africa : their classification, distribution and ecology
An analysis of the Holocene ostracod fauna of the Agulhas Bank has been carried out on seventy-three surficial sediment samples. Sixty-six species of Ostracoda have been recorded, of which fifty-nine species are accounted for in forty genera and the remaining seven species are of indeterminate …
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The Ecology of The Recent Ostracods of The Todos Santos Bay Region, Baja California, Mexico
Made available in DSpace on 2014-12-04T19:13:32Z (GMT). No. of bitstreams: 1 0015185.pdf: 9664799 bytes, checksum: 5ad6d8a3b347ad7ba137ec72c20e1fde (MD5) Previous issue date: 1955
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Paleoecology of late quaternary Molluscan-Ostracod assemblages from the Norwood site, southeastern Minnesota
<p>Well-preserved fossils, including mollusks, ostracods, beetles and plant remains were extracted from sediments at the Norwood Site in southeastern Minnesota during July, 1977. Stratigraphic units, in ascending order, were: (1) sandy claystone, (2) clayey siltstone, (3) sandy siltstone, and (4) …
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Paleoenvironments of the Eocene Green River Formation (Laney Member) in the Anvil Wash area, Southwestern Wyoming
… that require oxygenated water and freshwater ostracods indicate deposition of finely laminated sediments in a well oxygenated, shallow, freshwater lake. Mineralogical evidence indicating that Lake Gosiute was primarily fresh during deposition of the upper portion of the Laney Member includes …
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Comparative analysis of gene expression in two sexually dimorphic crustacean species Euphilomedes carcharodonta and Euphilomedes morini
… Many members of the sarseilloid family of ostracods exhibit sexual dimorphism of their lateral eyes with males having an image forming eye, while females have a rudimentary eye limited to sensing light and dark. Ostracods progress through five instar stages of development before becoming an …
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Feeding Ecology of Fishes in a South Dakota Power Plant Cooling Reservoir
… length-groups positively selected Chydorinae, ostracods, Caenis spp. larvae, chironomid pupae, and Physa spp., while they negatively selected cyclopoid copepods, Ceriodaphnia spp., and Tanypodinae larvae. Chironomid larvae were positively selected by bluegills mm, but were negatively selected …
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Postglacial ostracod distribution and paleoecology, Devils Lake basin, northeastern North Dakota
… The cores were sampled, for the recovery of the ostracods, at 10-cm intervals. Fifteen species of ostracods were present in the studied cores: 8 candonids, 1 cyclocyprid, 3 cyprids, and 3 limnocytherids. Two distinct faunas are recognized. The Devils Lake-East Devils Lake fauna consists of …
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Analysis of Lacustrine Deposits of Custer Lookout and Leftor Butte, Stark County, North Dakota
… analysis and fossil allochems. Fossil ostracods and a charaphyte were critical in determining the lacustrine origin of the limestone beds. </p>
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Thin and Etched Section Analysis of a Limestone in the White River Formation
… are present which appear to be fresh water ostracods. The porosity and permeability of the sample were found to be relatively poor.</p>
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Ecology of Lake District ostracoda
Freshwater ostracods are potentially useful for environmental monitoring and, since their calcified valves may be preserved in lake sediments, are also valuable in palaeolimnological studies of environmental pollution such as eutrophication and surface water acidification. To establish a data-base …
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Paleontology of brackish-water faunas in two tongues of the Cannonball Formation (Paleocene, Danian), Slope and Golden Valley counties, southwestern North Dakota
… cf. G. tenuicarinata, and ?Coniobasis sp.) 2 ostracods (Candona sp. and Ilyocypris sp.), and 1 charophyte (Sphaerochara sp.). No species are in common with the two formations and only two species are in common with the two Cannonball tongues (Corbicula berthoudi? and Corbula (Bicorbula) …
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Paragenesis of Lacustrine Microbialites in the Upper Wilkins Peak Member, Green River Formation, Wyoming
… dolomite or occasional euhedral calcite. Ostracods embedded in the microbialites are replaced by dolomite with secondary calcite cement coating the dolomitized shell. However, the associated matrix contains unaltered ostracods (original calcite). The order of diagenesis for microbialites …
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Cretaceous ostracoda of the super family Cytheracea from Iraq, their biostratigraphy and correlation with adjacent regions
The cretaceous ostracods of Iraq are poorly known, so the aim of the project was to study their taxonomy and to discover their value in correlation between wells in Iraq and between Iraq and neighbouring countries. The Cenomanian-Santonian ostracods of the superfamily Cytheracea were studied in …
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Physical and chemical correlates of Sacramento County vernal pool crustaceans
… the first species to emerge in large numbers. Ostracods, Cladocera and clam shrimp experienced large populations later in the season. Temperature showed strong correlations with most species and likely affected growth rates and emergence; conductivity, depth, and surface area were also …
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The entocytherid ostracod fauna of the James and York River basins
Entocytherid ostracods were collected on crayfishes inhabiting the James and York River basins of Virginia. Of the seventeen species encountered, only one (Donnaldsoncythere ardis) seems to be endemic. Ankylocythere ancyla, Dactylocythere banana, Dt. falcata, Dt. suteri, Donnaldsoncythere ardis, …
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