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¹ Institute for Evolutionary Ecology of National Academy of Sciences of Ukraine, Laboratory of Preservation and Biodiversity Renewal, Kiev, 03143, Ukraine
² Universidad Veracruzana, Instituto de Ciencias Marinas y Pesquerías, Laboratorio de Botánica Marina y Planctología, Boca del Río/Veracruz, 94294, Mexico
³ Ukrainian Scientific Center of Ecology of the Sea (UkrSCES), Department of Scientific Studies and Protection of Marine Biocenoses, Odessa, 65009, Ukraine
⁴ Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Département Océanograhie et Dynamique des Écosystèmes, Unité Littoral, Laboratoire Environnement littoral et Ressources aquacoles Bretagne Occidentale, Station de Biologie Marine de Concarneau, Concarneau/Bretagne, 29900, France
⁵ Institute for Evolutionary Ecology of National Academy of Sciences of Ukraine, Department of Phytoecology, Kiev, 03143, Ukraine DOI : 10.4194/TRJFAS25068 Viewed : 217 - Downloaded : 251 Thecal morphology and morphometry of the planktonic dinoflagellate Protoperidinium paulseni (Pavill.) Balech were studied in samples taken in the northwestern Black Sea (Odessa Bay). Using epifluorescence microscopy, data on the apical pore complex, apical intercalary, sulcal and cingular plates were obtained for the first time; the presence of the hypothecal pore in the 1`` plate is also reported for the first time. The epitheca morphology was clarified (para 1` and hexa 2a plates). Cells are 50.3-65.4 μm long and 38.5-52.4 μm wide (n=15). Light micrographs of the examined cells are given. A comparison between the original descriptions and illustrations of P. paulseni, P. knipowitschii, our cells from Odessa Bay, as well as P. fatulipes and P. saltans (the species mentioned in the literature as morphologically similar to the former two), was made. The results showed that Peridinium knipowitschii described from the Sea of Azov and later transferred to the genus Protoperidinium can be considered synonymous to Protoperidinium paulseni (Pavill.) Balech 1974 (basionym: Peridinium paulseni Pavill. 1909). Data on the geographical distribution of P. paulseni are presented. Keywords : Black Sea Dinoflagellates Protoperidinium Synonymy Thecal morphology