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Green algae (Volvox globator): 1) Spherical colony, a - a" - male organs, bb - female organs (Oogonium); 2) Fertilization of a female organ by floating seeds (Spermatozoids); 3) Immature egg spore; 4) Spermatozoids bundle; 5) Spermatozoids, isolated and in motion; 6) Spermatozoids, killed by iodine solution to visualize the attachment of the flimmer flagellum; 7) Detail of a spherical colony, a - reproductive cell, b - three vegetative cells, semi-schematic. Volvox is a polyphyletic genus of chlorophyte green algae in the family Volvocaceae. It forms spherical colonies of up to 50,000 cells. They live in a variety of freshwater habitats. Wood engraving, published in 1894.