Аннотация:The species Parasabatieria clavicauda Filipjev, 1918 (fam. Comesomatidae) from the Black Sea, was described in Filipjev’s monograph with many other species from the Sevastopol’s surroundings. Later Gerlach suggested this species as conspecific to Sabatieria vulgaris de Man, 1908 from the North Sea, which further was synonimised with Sabatieria pulchra (Schneider, 1906) from the Finish Bay. Our material was obtained from the Gelendzhik Bay in 2020-2021, from depths of 3-8m, from seven stations, where the density of Sabatieria clavicauda fluctuated from 11 to 1720 indiv. (10 cm–2). Comparison of S. clavicauda and S. pulchra showed significant difference in morphological features. Hiatuses in features, associated with body length, and hiatuses in spicules lengths were revealed. The sequence similarity of 18S (696 bp) and 28S (653 bp) rRNA genes regions obtained for samples from the Black Sea (depth 3 m, hydrogen sulfide mud) was 99.7-100% and 99.4-100% respectively. At the same time, the similarity with other representatives of the genus Sabatieria (from the NCBI nucleotide sequences database) did not exceed 99.1 and 94.5%. Phylogenetic reconstruction based on the 18S rRNA gene sequence obtained using the maximum likelihood method (FastTree 2.1.11) showed that the Black Sea sequences form a single clade. S. pulchra, S. mortenseni and S. punctata are sister clades to it, as well as several precisely undefined representatives of Sabatieria sp., S. pulchra, S. punctata and Sabatieria sp. from different areas of the North Atlantic (North Sea, English Channel, and Portuguese coast) appeared to be the closest to the Black Sea specimens. We believe it is necessary to restore the validity of the species Sabatieria clavicauda (Filipjev, 1918) for the Black Sea population. Perhaps, the merging of Black Sea and northern species that took place in the 20th century was not always justified, and the natural habitats of the ‘old’ widespread North Atlantic species require revision.