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Chlorophyta: Chlorophyceae: Volvocales: Volvocaceae

Volvox globactor
(Linnaeus, 1758) Ehrenberg

Genus: Colonies (coenobia) up to 1.5 mm diam.; many cells (500-60,000) in single layer; somatic cells identical, variable shape, with 2 outwardly directed flagella; asexual reproduction by formation of a daughter colony by loss of flagella and repeated division of a gonidium to produce a small hollow sphere of cells in which flagellar bases and nuclei are oriented inwards; before being released, daughter colony undergoes "inversion" turning inside out; flagella then form (Illustrated Guide, 1985).
Species: 5000-15,000 cells with cytoplasmic connections (Kudo, 1966). Cell body star-shaped, or amoeboid in shape, gelatinous matrix clearly separated from each other; colony consisting of 8000-17000 cells with a thick cytoplasmic connection.

Volvox globactor (Linnaeus, 1758) Ehrenberg, tape No. 0066, time code 0926, cell body amoeboid in shape with cytoplasmic connections, gelatinous matrix clearly separated from each other, Japan, May-June 1999 by Y. Tsukii

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