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  • Author: N. Sergeeva x
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Deep-Water Benthic Polychaetes (Vigtorniella Zaikai and Protodrilus sp.) in the Black Sea as Indicators of the Hydrogen Sulfide Zone Boundary

The Black Sea hypoxic layer, situated near the boundary of the hydrogen sulfide zone, is inhabited by the polychaetes Vigtorniella zaikai, Kisseleva, 1992 and Protodrilus sp., which can serve as indicators of the interface between oxic and anoxic water. The maximum number of polychaetes in the northern part of the Black Sea occur at a depth of 150 m, while near Bosporus, where the flow of the Marmara Sea water enters the Black Sea, the peak depth varies from 150 to 250 m.

Goodayia Rostellatum Gen. N., Sp. N. (Protozoa) - A Monothalamous Foraminiferan from the Black Sea

Goodayia rostellatum gen. n., sp. n. (Protozoa) - a Monothalamous Foraminifera from the Black Sea. Sergeeva N. G., Anikeeva O. V. - Goodayia rostellatum gen. n., sp. n. is described from the open slope of the Black Sea along the northwestern part of the Crimean Peninsula (160 m water depth). The test of this very delicate, organic-walled, monothalamous (single-chambered) foraminifer is elongated and becomes wider from the middle to the apertural end. Test wall consists of two layers, and the protoplasm is separated from the inner layer by a more or less distinct space. The protoplasm is finely granular, homogeneous, without foreign inclusions. The single terminal apertural structure has an asymmetric, beak-like shape with the aperture located under the beak. The nucleus is situated more or less in the middle of the test. The shape and size of the test, the presence of two membranes, and the single terminal aperture are the features reminiscent of the genera Gloiogullmia and Rhynchogromia. However, the new genus has significant differences from these taxa, notably the absence of any foreign mineral or organic particles adhering to the test wall, and the beak-shaped apertural structure.

The results of investigations of tardigrades (2009-2010) in the Bosporus outlet area of the Black Sea are represented. For the first time two species of tardigrades Dipodarctus subterraneus (Renaud-Debyser, 1959) and Tanarctus ramazzottii (Renaud-Mornant, 1975) are recorded for the Black Sea. Tardigrades are registered on 4 stations at depths range 88-250 m. Average abundance of tardigrades widely varied from 141 to 11 440 ind./m2. The vertical distribution of tardigrades in the sediments was analyzed: most specimens (up to 98 %) found in the top 0-1 cm sediment layer.