Abstract
First detection of free-living nematodes Microlaimus tenuispiculum de Man, 1922 from the Black Sea is marked. Species is found off the coast of Crimea and on the NW shelf of the Black Sea (in areas of Zernov’s Phyllophora Field and submarine Dnieper Canyon) at depths from 5 to 190 m on different types of sediment (sandy-silt, dense silt clay and silt with hydrogen sulphide). Description with illustrations of M. tenuispiculum is given. The Black Sea specimens differs by the shorter tail (c = 7.3–9.1 vs c = 6–7.5), shorter esophagus (b = 6.9–8.2 vs b = 6–6.9) and the presence of somatic setae.
Highlights
Representatives of genus Microlaimus de Man, 1880 are widely distributed in benthos from shallow-water to deep-sea habitats (Semprucci et al 2013, Giere 2009) including maximum depth of 7800 m in the southern part of the Pacific Ocean (Gambi et al 2003)
The Black Sea specimens differs by the shorter tail (c = 7.3–9.1 vs c = 6–7.5), shorter esophagus (b = 6.9–8.2 vs b = 6–6.9) and the presence of somatic setae
Unknown species of free-living nematodes – M. tenuispiculum was found during benthic studies carried out in different areas of the Black Sea
Summary
Representatives of genus Microlaimus de Man, 1880 are widely distributed in benthos from shallow-water to deep-sea habitats (Semprucci et al 2013, Giere 2009) including maximum depth of 7800 m in the southern part of the Pacific Ocean (Gambi et al 2003). The areas of distribution of the nematodes from the genus Microlaimus include sites with more variable content of oxygen, hypoxic and anoxic conditions of the Black Sea benthal at depths from 5 to 2080–2121 m (Sergeeva & Kolesnikova 2003, Kulakova 2013, Mureşan 2014). In the Black Sea representatives of this species occur both in shallow-water and deep-sea habitats with abundance up to 81% in the total nematodes community structure
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