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Chlorophyceae: Volvocales: Spondylomoraceae
Volvocida: Volvocina: Volvocidae

 Pyrobotrys rostrata
(Schulze) Huper-Pestalozzi 1961
Syn.: P. acuminata Sarma et shyam 1974

Pyrobotrys Species: Colony of 4 or 8 cells; "chaplet" structure not obvious, cells radially arrange; cell body anteriorly rounded, posteriorly elongated and tapered, 10-32 μm long, 8-10 μm wide; cellwall thin; papilla absent; chloroplast filling posterior end; stigma elliptical, anterior; two contractile vacuoles apical (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

Pyrobotrys rostrata (Schulze) Huper-Pestalozzi 1961 (or P. incurva Arnoldi 1916 ?), colony consisting of 8 cells, cell body 12-20 μm long, 5-10 μm wide, posterior end filled (?) with chloroplast, stigma elliptical, x 640, Naruto town, Chiba Pref., Japan, September 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva Pyrobotrys incurva

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