Ostracods Research Articles

New Protocytheridae and Mandocytheridae Ostracods from the Aptian of the Crimean Mountains

Two new Ostracoda species are described from Aptian sediments of the Crimean Mountains, Protocythere whatleyi Karpuk, sp. nov. (Protocytheridae Lyubimova, 1955) and Homocythere spinasphaerica Karpuk, sp. nov. (Mandocytheridae Grundel, 1969).

Ostracods of the Toarcian (Jurassic) of Peniche, Portugal: taxonomy and evolution across and beyond the GSSP interval

Ostracods of the Toarcian (Jurassic) of Peniche, Portugal: taxonomy and evolution across and beyond the GSSP interval

Interaction between ostracods and anurans: a review and new records in Brazil

Interaction between ostracods and anurans: a review and new records in Brazil

Corrigendum to: Luminaries of the reef: The history of luminescent ostracods and their courtship displays in the Caribbean

Corrigendum to: Luminaries of the reef: The history of luminescent ostracods and their courtship displays in the Caribbean

Luminaries of the reef: The history of luminescent ostracods and their courtship displays in the Caribbean

Luminaries of the reef: The history of luminescent ostracods and their courtship displays in the Caribbean

Six species of the ostracod families Loxoconchidae and Cushmanideidae from South Korea

Three Loxoconcha Sars, 1866 (L. bizenensis Okubo, 1980, L. japonica Ishizaki, 1968, and L. tosaensis Ishizaki, 1968), one Loxocorniculum Benson and Coleman, 1963 (Lc. mutsuense Ishizaki, 1971), and two Pontocythere Dubowsky, 1939 (P. miurensis (Hanai, 1959), and P. xiphoidea Nakao and Tsukagoshi, 2002) species are briefly redescribed and illustrated. Soft part morphology of L. tosaensis are described and illustrated here for the first time, since this species was known only by the shell morphology. A key to all living Loxoconcha and Loxocorniculum species from East Asia is suggested to facilitate subsequent identification, along with the lists to all East Asian species of the three genera.

First data on predation of Eucypris mareotica (Crustacea, Ostracoda) in hypersaline waters

Seed shrimp Eucypris mareotica is a widespread species and can reach high abundance in hypersaline lakes and lagoons of the Crimea and other regions. As an example, the maximum abundance of E. mareotica in the hypersaline Chersonesskoye lake reached 198,500 ind./m3 in the plankton, 580,000 ind./m2 in the benthos, and 220,000 ind./m2 in floating Cladophora mats. The species with such high abundance must play an important role in food webs but this role is not known now. Samples were collected from the different habitats in the lake to conduct gut content analysis of E. mareotica. The proportion of ostracods with food items in guts ranged from 9% to 100% in a sample. In 50% of them, animals found in ostracod gut contents include animals (Copepoda (Calanoida or/and Harpacticoida), Cladocera, or Nematoda). The most abundant food item was Cletocamptus retrogressus (Harpacticoida). Experiments with eggs, cysts and nauplii of Artemia (Anostraca) suggested that ostracods cannot break the cyst shells, but as soon as the nauplii hatched, they could be eaten by ostracods. Non-dormant (summer) Artemia eggs have weaker outer shells; ostracods break shell integrity with their antennae and then consume them. Animals play an important role in the diets of E. mareotica in the Crimean hypersaline lakes and lagoons, as can be assumed in other regions also.

백악기 함평분지에서 산출되는 담수 개형충 화석 연구

이 연구에서는 전라남도 함평군 일대에 분포하는 백악기 함평분지에서 산출된 담수 개형충의 분류학적 기재, 생층서 연대 및 고환경을 논의하였다. 연구지역의 개형충 군집은 총 5속 10종으로 이루어져 있으며, 전형적인 호소 환경의 종들로 확인되었다: Cypridea cf. changluensis, C. cf. subprognata, C. sp., Mongolocypris sp. 1, M. sp. 2, Candona cf. arcinaeformis, C. sp. 1, C. sp. 2, Mantelliana sp. 및 Timiriasevia sp. 이 중에서 Mantelliana와 Timiriasevia에 속하는 종들은 남한에서 처음으로 보고되는 분류군들이며, 특히 Timiriasevia의 산출을 통해 함평분지가 주기적인 계절변화의 영향을 받았던 호소환경이었다고 추론하였다. 또한 함평분지의 개형충 군집을 백악기 동아시아의 분류군들과 비교한 결과를 토대로 분지의 형성시기를 Aptian 내지 Albian으로 해석하였다.

Cd2+对Cypridopsis vidua（介形纲）肠壁结构的毒性效应

Cypridopsis vidua is one of the few ostracods which can surrive from heavy pollution water. The toxic effects of Cd2+ on C. vidua and its intestinal ultrastructure were examined using a static renewal system. The LC50 values for cadmium in C. vidua were 5.00, 2.01, 0.46 and 0.14 mg/L at 24, 48, 72 and 96 h exposure respectively, and the safe concentration of Cd2+ for long-term C. vidua survival was less than 0.014 mg/L. To observe the structure changes of its intestinal, four Cd2+ concentrations were set up, and two of them were below the safe concentration of Cd2+ (0.001 and 0.004 mg/L) and the other concentrations were above its safe concentration (0.016 and 0.064 mg/L). The experiment lasted for 7 days. When microstructure of C. vidua was observed, the gastrointestinal orga-nization was not damaged below the safe concentration; while the degree of injury showed a certain amount of time and dose effects in 24-72 hours above the safe concentration, and some structures among those surviving animals were slightly recovered in 7 days under same concentration. Sub-microscopic analysis of intestinal cells of C. vidua in two concentrations (0.004 and 0.064 mg/L) groups showed, different degrees of structure damage were found in the cell membrane, cytoplasm and organelles, which worsened with increasing Cd2+ con-centrations. Among these cellular structures, the damage to the membrane system of the cell was especially serious.

The stratigraphic architecture and depositional environments of non-marine carbonates from barremian-aptian pre-salt strata of the Brazilian continental margin

The stratigraphic architecture and depositional environments of non-marine carbonates from barremian-aptian pre-salt strata of the Brazilian continental margin

Five new records of ostracods (Crustacea) from Korea

Five new records of ostracods (Crustacea) from Korea

SPINICAUDATANS FROM THE UPPER JURASSIC OF ARGENTINA AND THEIR PALEOENVIRONMENTS

Fil: Monferran, Mateo Daniel. Universidad Nacional del Nordeste; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Nordeste. Centro de Ecologia Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecologia Aplicada del Litoral; Argentina

Ostracod evidence for the Neolithic environment of Rio Sizandro, Portugal: Part 2

Ostracod evidence for the Neolithic environment of Rio Sizandro, Portugal: Part 2

Paleolimnological record of the climate and pre-historic settlement from chalk karst region (Chełm Hills, SE Poland)

The multi-proxy study (subfossil Cladocera and Ostracoda, palynology, sediment chemistry, stable isotopes) of the sedimentological record from three, closely situated, shallow lakes reveals multiple interactions between the lake esosystems and the main drivers of their mid- and late-Holocene development – climate changes and human actions within their vicinity. Such multi-proxy studies, built upon four complete cores obtained from three nearby situated sites, provide us with an unique advantage/opportunity to disentangle climate and human influence, as well as to trace in detail the ecosystem response. Starting from the Atlantic period, the favourable natural conditions of the Chelm Hills region (mainly rich, workable soils) attracted early settlement more than did nearby regions. This settlement grouped with close vicinity to natural water sources: lakes and small river valleys. Despite the rather low impact of the early settlement on the natural environment, its traces can be made visible from the pollen record of lake archives, as well as from eutrophication signals revealed by subfossil Cladocera and Ostracoda. In this study, three main settlement phases were noted. Herein, hemp retting practices were identified for all the lakes. This is put forward as the most profound factor in this lake ecosystem development (resulting, among other issues, in severe anoxia) and therefore, it was studied in detail as well as the issue of its further recovery

Organización trófica de las mojarras (Pisces: Gerreidae) de la Ciénaga Grande de Santa Marta (Caribe Colombiano)

The feeding habits of the eight species of mojarras (Gerreidae) occurring at the Cienaga Grande de Santa Marta are described. Three methods were used to analyze the food eaten by 365 specimens: gravimetric, frecuency of ocurrence and a relative importance indexo Mojarras are omnivorous and euriphagous fishes, eating a wide spectrum of items, mainly small invertebrates (bivalves, gastropods, ostracods, copepods, polychaetes) taken on the oyster banks located inside the Cienaga and on the sand-muddy bottoms near the mouth of Ihe lagoon. Intraspecific competilIon seems lo be lowered as a consequence of the spatial segregation of the populations and the diel variation of the food items. Percentage of replenished stomachs increases in Ihe high salinity periodo The usefulness of Ihe various food analysis methods is compared, and the frecuency of occurrence method is recommended for this group.

Micropalaeontology and Stratigraphy

The 25th Indian colloquium on micropalaeontology and stratigraphy was organized recently. The principal themes of the silver jubilee event were: recent developments in micropalaeontology; advances in micropalaeontological studies of Foraminifera, Radiolarians, Ostracods, Bryozoa, Calcareous Algae, Diatoms, Nannoplanktons, Dinoflagellates, palynological studies, geochemical studies of microfossils and their application in palaeoclimatology, palaeoceanography, palaeolimnology and tracing the history of marine and lake pollution; microfossils and Late Quaternary climate.

Non-marine Ostracoda in Sağlık plain, Kahramanmaraş, Turkey, since the Late Glacial to mid-Holocene

We present the freshwater ostracod stratigraphy of former lake, in Saglik plain, South Central Anatolia, Turkey, since the Last Late Glacial until the mid-Holocene. Podocopoid (non-marine) ostracods were identified in Saglik II (SAĞ II) core whose the lowermost part goes back to 15500 years ago. Both smooth and noded forms of Cyprideis torosa ( Jones, 1850 ), Candona sp . ( Baird, 1845 ), Ilyocypris sp. ( Brady & Norman, 1889 ) , Darwinula stevensoni ( Brady & Robertson, 1870 ), Plesiocypridopsis newtoni ( Brady & Robertson, 1870 ), and Prionocypris zenkeri ( Chyzer&Toth, 1858 ) were the observed species

PALEOBIOGEOGRAPHY AND PALEOECOLOGY OF THE OSTRACOD HELIOCYTHERE BONADUCE, RUGGIERI & RUSSO, 1988 WITH RE-DESCRIPTION OF MIDDLE MIOCENE HELIOCYTHERE MORAVICA (PROCHÁZKA, 1893) FROM THE CARPATHIAN FOREDEEP (CZECH REPUBLIC)

Twelve species attributed to the genus Heliocythere have been recorded from the epineritic/neritic and circalittoral/epibathyal deposits of Cenozoic subtropical seas. The oldest species is from the Lower Oligocene deposits of the northwest Indian Ocean. The youngest species are confirmed from the Late Miocene (Messinian) of the Mediterranean area and one stratigraphically uncertain record from the Early Pliocene of Vejer de la Frontera (southern Spain). Heliocythere profited of a marine connection between the Mediterranean and the Paratethys through the Slovenian corridor during the latest Burdigalian (Karpatian) and settled in Central Europe and Balkan Peninsula marine biotopes, but a paleogeographic and paleoecologic change during the late Serravallian caused an extinction of Paratethyan Heliocythere . In Late Miocene times, Heliocythere spread through the entire Mediterranean area and extended its biogeographic range to the eastern Atlantic Ocean. This was a period of maximum species diversity of Heliocythere. No Heliocythere species has been described from present-day marine ostracod associations and we suppose that this fully marine genus is extinct. Due to the loss of the type material and the necessary correction of genus attribution, we designate herewith a neotype for theearly Badenian (early Langhian) Cythere moravica Proch√°zka, 1893 from the Carpathian Foredeep, referred to in this work as Heliocythere moravica (Proch√°zka, 1893). We discuss its paleoecology and position within the genus Heliocythere .

Eucypris fontana(Graf, 1931) (Crustacea, Ostracoda) in permanent environments of Patagonia Argentina: a geometric morphometric approach

Fil: Ramos, Lorena Yesica. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Patagonia Norte. Instituto de Investigacion En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; Argentina

ANADOLU HİSARI (İSTANBUL BOĞAZI) HOLOSEN ÇÖKELLERİNİN DENİZEL MİKRO VE MAKRO FAUNASI İLE XANTHO PORESSA (OLIVI) (Crustacea : Decapoda : Xanth Idae )’NIN VARLIĞI

In this study, have been revealed known as recently in Holocene sediments Anadolu Hisari of Xantho poressa (Olivi) from Crustacea-Decapoda. This crab species is recorded from Mediterranean to Black Sea, and also from the Canary Islands to Portugal in north-eastern Atlantic Ocean. It is generally found at depths between 0 to 15 m in the intertidal and shallow subtidal zones. Broken crab carapaces together with bentic foraminifer, ostracod, bryozoan, pelecipod and gastropod are found in 78 samples collected from different levels of eigth of the cores taken from the basement of Kucuksu Palace at the Anadolu Hisari. These parts of crab carapaces are determined as belonged to Xantho poressa (Olivi). The 14C numerical age data is fixed as 6.644±48 BP the age of the basement levels of the studied sequence. This crab species and the other fauna assemblages of the Mediterranean and Black Sea origin are shown to live at the same environmental conditions