Revkova T., Sergeeva N. Stylotheristus paramutilus sp. nov. (Nematoda: Xyalidae), a new nematode species from the Black Sea. Marine Biological Journal, 2024, vol. 9, no. 1, pp. 76-85. https://doi.org/10.21072/mbj.2024.09.1.06



Stylotheristus paramutilus sp. nov. from bottom sediments sampled in shallow-water and deep-sea habitats in the Black Sea is described and illustrated. The new species is characterized by well-developed lip region; 12 setiform cephalic sensilla in female and 16 in male; cervical setae present; spicules 0.6–0.9 anal body diameters long and expanded proximally; gubernaculum plate-like slightly curved; conico-cylindrical tail of 4.5–5.8 anal body diameters (except for one male with it equal to 12.9 anal body diameters); and 3 terminal setae. The present study provides the first Stylotheristus species record in the Black Sea. S. paramutilus sp. nov. is characterized by a wide spatial and bathymetrical (2–250-m depths) distribution in the Crimea region and the Istanbul Strait’s (Bosphorus) outlet area of the Black Sea. However, in future, molecular analysis is required to confirm the identity of these specimens from different Black Sea habitats.


T. Revkova

junior researcher



N. Sergeeva

chief researcher, D. Sc.




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This work was carried out within the framework of IBSS state research assignment “Biodiversity as the basis for the sustainable functioning of marine ecosystems, criteria and scientific principles for its conservation” (No. 124022400148-4).



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