A rich Ostracod fauna from Cape Kalogeras (Zakynthos island, Greece) (original) (raw)
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Late Pleistocene, Holocene, and Recent ostracods from the Gulf of Argos, Greece
Courier Forschungsinstitut Senckenberg, 1989
The objective of this study is to outline the Late Quaternary history of a submarine depositional environment and the evolution of its ostracod fauna. Samples from the beach and the bottom of the Gulf of Argos provided recent ostracod populations, which are used here as ecological indicators and compared with fossil assemblages taken from core samples of buried marine Holocene and Pleistocene deposits. The Late Quaternary depositional environment of the Gulf of Argos is characterized by sediment accumulation and eustatic sea-level changes which have produced a succession of transgressive and regressive sequences. Each transgressive sequence begins with an assemblage of those organisms which first populated the newly formed euryhaline environment, in which the near-shore fauna as a whole can be characterized as a little diversified Xestoleberis/Loxoconcha assemblage.
International Review of Hydrobiology, 2012
The present study provides a thorough analysis of the composition of recent marine ostracod populations from the bottom sediments of the central Aegean Sea, as well as their distribution patterns. In particular, a detailed qualitative and quantitative study of living ostracod assemblages was carried out in the marine environments of SE Andros Island. Sampling took place at Kastro and Korthi Gulf, both located at the southeastern coast of the Andros Island and from depth of 1.5 to 18 m, while additional samples were collected outside the gulfs at a depth of 120-180 m. Only ostracods considered to have been living at the time of collection were picked from the samples. A total of 51 species belonging to 34 genera were identified and four main ostracod assemblages, representing different biotopes, were distinguished. The results produced from the application of Q-mode cluster analysis in the data set, the calculated assemblage structure indices for each sample, as well as the bathymetric and granulometric data are as follows: Hiltermannicythere rubra assemblage (occurs in substrates of sandy mud and at a water depth ranging from 40-60 m to the depth of 100 m or even more), Loxoconcha affinis, Xestoleberis sexmaculata assemblage (occurs in substrates of muddy very fine to fine sands and shallower environments), Semicytherura incogruens assemblage (occurs in very fine sands at a water depth from 10 to 28 m), Loculicytheretta pavonia and Neocytherideis fasciata, Pontocythere turbita assemblages (occurs mainly in fine sands and at a water depth between 3.5 and 15 m) and Urocythereis neapolitana assemblage (occurs in substrates of medium to coarse sand and at a water depth of less than 20 m).
Micropaleontology
The purpose of this study is to collect micropalaeontological evidence concerning the palaeoenvironmental changes that took place at Southern Evoikos Gulf during the Holocene. Southern Evoikos Gulf is a shallow epicontinental basin, at the northern prolongation of the Cycladic Platform (Western Aegean Sea, Greece). The study area of the present research is located at the northern part of this gulf. Two cores,DEH 1 andDEH 5, the sedimentary record of which covers the last 13910 cal. yr B.P., were recovered from 70m and 75.5mwater depth respectively and a detailed quantitative and qualitative ostracod analysis is performed in 88 samples of DEH 5 and 56 samples ofDEH1.Atotal of 45 ostracod specieswere identified fromDEH1 and 52 species fromDEH5. The distribution of ostracod assemblages in the investigated cores indicates that a restricted shallow oligohaline lagoon was formed sometime before 13540 cal yr BPat the northern basin of the Southern Evoikos Gulf. This closed lagoon existed i...
Revue de Micropaléontologie, 2008
Ostracods from ten Late Miocene coral reef complexes built by Siderastrea, Tarbellastrea and Porites, cropping out in the Messara Plain (southern Iraklion basin, central Crete), have been investigated and five assemblages have been recognised, which point to different marine environments: (1) assemblage from the basal sandy silts, dominated by very shallow inner-infralittoral species, such as Cyamocytheridea meniscus, Cyamocytheridea obstipa, Cyamocytheridea dertonensis, Cytheretta semiornata and Nonurocythereis seminulum; (2) assemblage from the coral reef complexes within which Grinioneis haidingeri, Aurila cicatricosa, Cimbaurila diecii, Tenedocythere cruciata, Pokornyella italica and Callistocythere quadrangula are dominant and point to a stable inner-infralittoral environment characterised by warm, quiet and well-oxygenated waters; (3) assemblage from the silts intercalated among the coral reef complexes, mainly characterised by Neomonoceratina laskarevi, Cytheridea acuminata, Phlyctenophora farkasi and Aurila albicans together with Callistocythere spp., Xestoleberis communis and Xestoleberis dispar, which points to a very shallow marine environment rich in aquatic vegetation; (4) assemblage from the upper silts, which records the absolute dominance of Xestoleberis species, reflecting a very shallow and highly-vegetated environment and (5) assemblage from the uppermost silty clays, dominated by Hemicytherura defiorei, Xestoleberis spp. and Palmoconcha dertobrevis, accompanied by Acanthocythereis hystrix, Cytherella scutulum, Bairdoppilata conformis, Semicytherura spp., Krithe sp., Cytheropteron alatum, Bythocypris sp. and Pseudocythere caudata, which suggest deeper marine environments probably located in the outer infralittoral/inner-circalittoral zones. The studied section has been dated by means of calcareous nannoplankton to be not younger than Zone MNN9 (Early Tortonian), which is the biostratigraphical datum recorded in the fine-grained deposits that overlie the coral reef complexes. An age not older than Tortonian can be inferred by the stratigraphical distribution of the recognized ostracods. Thus, the coral reef complexes have been tentatively referred to the Early Tortonian.
Description of two new species of ostracods from the Strait of Messina (central Mediterranean)
Zoosystema, 2013
More than 100 years after the studies of G. Seguenza, sediment samples from the Strait of Messina (central Mediterranean) were examined in order to study their ostracod faunas. Two new species, Anchistrocheles seguenzai n. sp. and Phlyctocythere sicula n. sp., were found, both in thanatocoenoses from the Bathyal zone, at a depth of 545 m. Anchistrocheles seguenzai n. sp. is distinguishable from A. tenera (Breman, 1975), the only living species of the genus in Recent Mediterranean, and from the other species of the genus because of the more reniform-subquadrangular outline of its carapace and the different height/length ratio values. In the same way, Phlyctocythere sicula n. sp. can be distinguished from P. pellucida (Müller, 1894) the only living species of the genus in Recent Mediterranean, because of its more rounded outline, less marked caudal process which is more obtuse and more shifted to the median side of the posterior end, the inflated postero-ventral area, the more acute anterior margin and the narrower marginal zone and vestibula. The stratigraphic and geographic distribution of some species of both genera is indicated. rÉsUMÉ Description de deux nouvelles espèces d'ostracode du détroit de Messine (Méditerranée centrale). Plus de 100 ans après les études de G. Seguenza nous avons collecté des échantillons de sédiments provenant du Détroit de Messine (Méditerranée centrale) pour étudier la faune d'ostracodes. Deux nouvelles espèces Anchistrocheles seguenzai
Geobios, 2007
In the Crete Island, late Messinian Lago-Mare facies are not well known. At present, the occurrence in Crete of the uppermost Messinian post evaporitic deposits is a matter of debate. According to several authors, the well-known late Messinian Lago-Mare facies does not occur in Crete. In this paper the preliminary results obtained from the biostratigraphical analysis of some sections sampled in the Messarà Plain will be shown. Nearby Faneromeni and Ano Akria villages, the Miocene/Pliocene boundary is well exposed. There, gypsum-bearing clay, laminated microcrystalline gypsum and gypsum-rudites characterize the evaporitic deposits of the Messinian stage. In these areas, above the Messinian evaporite, post-evaporitic fine-laminated polychrome clays, with intercalations of sandstones and conglomerates, have been found. In both the Faneromeni and Ano Akria area, the Pliocene grey clays and conglomerates rest unconformably on the uppermost Messinian post-evaporitic deposits. A 20 cm-spaced sampling has been performed in both the sections, for more than 100 samples collected. The results of the micropaleontological analysis performed on the Faneromeni and Ano Akria sections point to the occurrence of ostracod assemblages containing: Loxocauda limata (Schneider in Agalarova et al.), Loxocauda sp., Cytherura pyrama Schneider, Cyprideis anlavauxensis Carbonnel, Cyprideis agrigentina Decima, Amnicythere palimpsesta (Livental), Amnicythere propinqua (Livental), Amnicythere accicularia (Olteanu), Amnicythere costata (Olteanu), Amnicythere multituberculata (Livental), Amnicythere sp. D (Miculan in Bassetti et al.), Amnicythere sp. 2 Gliozzi and Grossi, Amnicythere sp., Euxinocythere (Maeotocythere) praebaquana (Livental in Agalarova et al.), Mediocytherideini indet., Pontoniella pontica (Agalarova), Camptocypria sp. 1 Gliozzi and Grossi, Caspiocypris sp., Zalanyiella venusta (Zalanyi), Tyrrhenocythere sp., Loxoconcha rhombovalis Pokorny, Loxoconcha eichwaldi Livental, Loxoconcha sp. A (Miculan in Bassetti et al.), Loxocorniculina djafarovi (Schneider in Suzin). In the analysed samples, reworked planktonic foraminifers and well-preserved charophyte gyrogonites have been also found. The ostracod assemblages found in the Messarà Plain belong to the Loxocorniculina djafarovi Zone (sensu Carbonnel, 1978), which characterizes the uppermost Messinian deposits of the whole Mediterranean Basin. At that time, the well-known Lago-Mare biofacies was also widespread on the Crete Island. The presence of Paratethyan ostracods in the post-evaporitic Messinian deposits of both Faneromeni and Ano Akria sections suggests that in the Crete Island the latest Messinian sedimentation took place in brackish water palaeoenvironments. # 2007 Elsevier Masson SAS. All rights reserved.
Italian Brackish and Marine Ostracod Fauna
Il Naturalista Siciliano, 2013
In the literature, there are many studies concerning ostracods in the Italian seas. Among the most relevant are the evergreen monograph of M\ufcller (1894) about the ostracods from the Gulf of Naples, the publications of BONADUCE et al., 1976 and BREMAN,1976 about the Adriatic Sea, PURI et al., 1964, again about the Gulf of Naples and BONADUCE et al., 1977 about the southern Tyrrhenian Sea. In addition, different authors centered their research in smaller areas of the Italian coasts (MONTENEGRO et al., 1998; SCIUTO & ROSSO, 2002; ARBULLA et al., 2004; SCIUTO, in progress;) proposed a synthesis of the most abundant and more easily identifiable ostracods from the Italian shelves, linking their occurrence to some environmental factors such as bathymetry and substrate. Ten different ostracod assemblages were observed in relation to the type of substrate, and nine bathymetric assemblages were detected. Evident changes of the autochthonous ostracod fauna were recorded at 50-60 m, 90-100 m and 125-150 m, corresponding to the infralittoral-circalittoral, inner-middle circalittoral and middle-outer circalittoral boundaries respectively. More recently, AIELLO & BARRA (2010) have published a checklist of the Italian marine ostracods, reporting 377 ostracod species from the screening of 84 papers. In this contribution, we present an updated database of the ostracod species pertaining to the infralittoral and circalittoral zones, together with those occurring in lagoon, intertidal, submarine cave and deep water settings. Furthermore, we intend to highlight the links between the ostracod assemblages..
Ostracods of the Paratethys Sea and Lake Pannon — Perspectives for renewal of cooperative projects
Senckenbergiana lethaea, 2008
Ideas from a workshop with the title 'Ostracods of the Paratethys Sea and Lake Pannon', organised during the 6 th European Ostracodologists' Meeting (EOM-VI), are briefly presented. The necessity to start a new active communication between palaeontologists and neontologists on the evolution and palaeoecology of ostracods of the marine Paratethys and Lake Pannon during the Cenozoic in Europe and Asia is stressed. This should continue and extend studies of earlier generations of ostracodologists who contributed to the chronostratigraphic and palaeobiogeographic understanding of this domain. Several research topics are proposed and their importance is supported by such arguments as: (1) the high relevance of studies dealing with the origin and diversification of the fauna of (palaeo)ancient lakes; (2) the reconciliation of the systematics of fossil and Recent ostracod taxa, for a better reconstruction of evolutionary histories; (3) a better perception of the developmental trajectories of various Recent and fossil ostracod taxa to facilitate the application of ostracods for palaeoecological studies. Finally, topics for future workshops dealing with Cenozoic ostracods are proposed.
New Permian ostracods from Greece (Hydra Island)
Journal of Micropalaeontology, 1998
A new Permian (Late Asselian-Dorashamian) ostracod fauna (66 species belonging to 35 genera) from Hydra Island (Greece) is described. Twelve new species are described: Hollinella (P .) hydraensis Crasquin-Soleau nsp, Bairdia episkopiensis Crasquin-Soleau nsp., Bairdia rigasensis Crasquin-Soleau nsp., Bairdia thikiaensis Crasquin-Soleau nsp., Chamishaella marmariensis Crasquin-Soleau nsp., Cypridina gussevaae Crasquin-Soleau nsp., Cyathus barmariensis Crasquin-Soleau nsp., Cyathus klimakiensis Crasquin-Soleau nsp., Bairdiacypris bistiensis Crasquin-Soleau nsp., Shishaella hellenensis Crasquin-Soleau nsp., Bairdia ishizakii Crasquin-Soleau nsp., Petasobairdia kozuri Crasquin-Soleau n.sp. Forty-four other species are figured. This assemblage is characteristic of a shallow water platform. The palaeobiogeographic relationships are presented and represent significant additions to the Permian Palaeo-Tethyan ostracod faunas.