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Euglenida: Sphenomonadida
Euglenophyceae: Sphenomonadales: Petalomonadaceae

Petalomonas bicarinata

Genus: Only 1 emergent flagellum; locomotory flagellum directed anteriorly, straight, during swimming; colourless, phagotrophic; no eyespot; rigid, solitary, ovoid, usually flat, with several keels; freshwater (Illustrated Guide, 1985). Oval or pyriform; not plastic; pellicle often with straight or spiral furrow; a single flagellum; many species (Kudo, 1966).
Species: 30-35 μm; 2 dorsal, 2 ventral grooves on either side of dorsal and ventral keels (How to know the protozoa, 1979).

Petalomonas bicarinata Stein (or P. dorsalis ?), cell body 24 μm long, μm wide, with only 1 keel, a flagellum 30 μm long, x 400, x 640, Japan, 1998 by Y. Tsukii

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