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Euglenophyceae: Sphenomonadales: Petalomonadaceae
Euglenida: Sphenomonadida

Petalomonas alata

Petalomonas alata 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).
Similar genus -->> Notosolenus;

Petalomonas alata, cell body with four longitudinal grooves, dorsal, ventral, two lateral, cell body 18 μm long, 11 μm wide, with only 1 keel, flagellulm 28 μm long, a contractile vacuole anterior, x 400, x 640, Kurome River, Asaka City, Saitama Pref., Japan, October 2000, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400

scale 31 μm scale 63 μm scale 94 μm; x 640

* P. bicarinata: 30-35 μm; 2 dorsal, 2 ventral grooves on either side of dorsal and ventral keels (How to know the protozoa, 1979).
P. mediocanellata: 21-26 μm; with median, longitudinal grooves, dorsal and ventral (How to know the protozoa, 1979).
P. alata: 23-25 μm; with one dorsal, one ventral, and two lateral grooves (How to know the protozoa, 1979).
P. asymmetrica: 18-25 μm; pyriform, with a deep lateral groove (How to know the protozoa, 1979).

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