Alekseev V.R. 2022. Morphological and ecological variability in Eucyclops (Speratocyclops) arcanus sensu lato (Copepoda: Cyclopiformes) with description of E. (S.) a. arcticus ssp.n. from tundra bog in European Arctic // Arthropoda Selecta. Vol.31. No.4: 384–386 [in English].

Zoological Institute of the Russian Academy of Sciences, Universitetskaya emb., 1, St.-Petersburg, 199034, Russia. E-mail:

doi: 10.15298/arthsel.31.4.02

ABSTRACT. Eucyclops (Speratocyclops) arcanus arcticus ssp.n. is described from the arctic swamps of the Bolshezemelskaya tundra that were frozen for 9 months. From nominative form known from Eastern Siberia new taxon is separated by combination of following characters: modified shape of receptaculum seminis; elongated setae in distal segments of legs 4 and shorten inner spine in rudimental leg 5. Ecologically, the new form appears to be able to survive frozen in ice for up to 9 months as an adult fertilized female with eggs, similar to some arctic harpacticoid species.

KEY WORDS: arctic copepods, redescription, new taxon, crustacean, aquatic invertebrate zoology.

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