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Actinocyclus pseudopodolicus sp. nov. and infraspecific complex of A. octonarius (Bacillariophyta) from Holocene sediments of the Sea of Azov

2018; Volume: 52; Issue: 1 Linguagem: Inglês

10.31111/nsnr/2018.52.1.33

2713-2609

R. M. Gogorev, Г. В. Ковалева, А. В. Назаренко,

Marine and environmental studies

New data on morphology of 7 infraspecific taxa of Actinocyclus octonarius, frequently found in the Holocene deposits of the Sea of Azov, are presented. New species A. pseudopodolicus Kovaleva et Gogorev, sp. nov., and variety A. octonarius var. tonsura Kovaleva et Gogorev, var. nov. are described. They are similar to varieties of A. octonarius and some other Actinocyclus species but differ from them in presence of curved fascicules of areolae in A. pseudopodolicus and hyaline ring on valves of A. octonarius var. tonsura.