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After Kosarev and Yablonska, 1994 and Dumont 1998 in Fabienne Marret, Suzanne Leroy, Françoise Chalié, Françoise Gasse, 'New organic-walleddinoflagellate cvysts from recent sediments of Central Asian seas, review of palaeobotany and palynology' 129, 2004; N.V. Aladin, Y.S.Chikov, V.E. Panov andI.S. Plotnikov, Chronology of Mnemiopsis and Beroe invasions to the Black, Azov and Caspian Seas, Presentation to the HELCOM-BSRP meeting on ballastwaters, Klaipada-Palanga, February 2005