Alekseev V.R., Chaban O.A. 2021. New records of continental cyclopids (Crustacea: Copepoda: Cyclopiformes) from Eastern Siberia and Russian Far East // Arthropoda Selecta. Vol.30. No.4: 503–520 [in English].

Zoological Institute RAS, St. Petersburg 199034, Russia. E-mail:

doi: 10.15298/arthsel.30.4.06

ABSTRACT. A brief description of morphological features of 7 species of cyclopids new to the fauna of Russia from the water bodies of Eastern Siberia (Eucyclops (Speratocyclops) dumonti Alekseev, 2000, Ectocyclops polyspinosus Harada, 1931, Cyclops borealis Lindberg, 1956), Primorsky Krai (E. (E.) agiloides roseus Ishida, 1997, Megacyclops magnus (Marsh, 1920), Mesocyclops (Pilosomesocyclops) mariae Guo, 2000) and Kamchatka (Eucyclops (Denticyclops) euacanthus (Sars, 1909)) is given. E. (S.) dumonti was described from Mongolia, then found in North China and its finding in small lakes of Transbaikalia was quite expected. Most of the remaining species new to our fauna were either also described from neighboring countries (China, Taiwan, Japan), or had already been found there earlier (South Korea). The type habitat of two species of the genus Eucyclops belonging to different subgenera, E. (D.) euacanthus and E. (E.) agiloides is Equatorial Africa (Lake Tanganyika), and the modern range covers the tropical and subtropical regions of the Old World and, possibly, Australia. The occurrence of E. agiloides and E. euacanthus in Primorsky Krai and Kamchatka represents the northernmost borders of the eastern part of their ranges and, possibly, reflects the tendencies of their expansion, caused by the evolution of the last period of the Tethys Sea. Ectocyclops polyspinosus, described from the island of Taiwan, was later found in some countries of Southeast Asia and in Canada. Finding it in the Baikal region and Primorsky Krai, apparently, falls on the most western and northern parts of its range, covering the Sino-Malay part of the Palaearctic. Two more species of cyclopids (Mesocyclops (Pilosomesocyclops) dissimilis Defaye et Kawabata, 1993 and M. (M.) pehpeiensis Hu, 1943) have already been encountered and their second finds confirm their presence in the fauna of the country and expand the areas of their distribution.

KEY WORDS: biodiversity, aquatic invertebrates, copepods, Tethys Sea, climatic factor, range expansion, Cyclops, Ectocyclops, Eucyclops, Megacyclops, Mesocyclops.

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