Dinoflagellat. Aussaugen der Eier von Pseudocalanus elongatus (Copepoda) durch die Schwärmer (Dinosporen) des farblosen Parasiten. Sporogenese (vegetative Vermehrung): Entwicklung zur Primärzyste, Aufteilung des Protoplasten in bis zu 32 Zellen, Differenzierung der Sekundärzysten, Entstehung von 16 oder 32 Dinosporen in den Sekundärzysten, Ausschwärmen der Dinosporen.

The peridinian Dissodinium pseudocalani feeds as an ektoparasite upon the eggs of the copepod Pseudocalanus elongatus. The swarmers (dinospores) of the parasite suck out the eggs holozoically by means of a sucker. The parasitic stage is followed by vegetative multiplication (sporogenesis). The bladder-like swollen peridinian develops into a primary cyst. Inside this the protoplast divides into 4, 8, 16 or 32 cells resulting in secondary cysts. Dissolving the cyst membranes the dinospores become free and are again capable of infecting eggs. Simultaneously, during sporogenesis the food clump, initially filling the whole protoplast, shrinks to a tiny reddish body.