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Chlorophyceae: Volvocales: Spondylomoraceae
Volvocida: Volvocina: Volvocidae

Pyrobotrys casinoensis
P. casinoensis (Playfair) Silba 1972 (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000)
P. casinoënsis (Playfair) Silva 1972 (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
Syn.: P. gracilis (Korschikoff) Korschikoff 1938

Pyrobotrys Species: Colony of 8 or 16 cells, layered by 4-celled "chaplet", up to 45 (-58) μm long; cell body ovoid or pear-shaped, slightly asymmetrical, posteriorly narrowed, but not drown out, 10-25 μm long; cellwall thin; flagella 1.5 times longer than the cell body; chloroplast cup-shaped; stigma located around the backward-inclined area of the cell (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

Pyrobotrys casinoensis (Playfair) Silba, cell body 14-15 μm long, 8 μm wide, flaglella about 25 μm long, x 640, Japan, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640

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