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Oligohymenophorea: Peritrichia: Sessilida: Ophrydiidae

Ophrydium sp.

Ophrydium Genus: Cell body long, contractile; posterior end pointed or rounded; in gelatinous matrix (Kudo, 1966).

Ophrydium sp., cell body 146 μm long, 23 μm wide, x 400, x 640, Shimo-no-koike (small pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 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
Ophrydium Ophrydium Ophrydium
Petalomonas Petalomonas Petalomonas Petalomonas

O. sessile Kent 1881: Fully extended body up to 300 μm long; colorless or slightly brownish; colony up to 5 x 3 mm; freshwater (Kudo, 1966).

O. vernalis (Stokes): Fully extended body up to 250 μm long; highly contractile; freshwater (Kudo, 1966).

O. ectatum Mast: Fully extended body up to 225-400 μm long; with many chlorellae; colony up to 3 mm in diam.; freshwater (Kudo, 1966).
O. vernale (Stokes): Cell body 250 μm long (Kahl, 1930).

O. versatile O.F. Müller, 1786: Fully extended body up to 300-600 μm long; with many chlorellae; colony up to 10 mm in diam. within gelatinous matrix; macronucleus band-form; contractile vacuole central with a canal connected to cytosotme; freshwater (Kojima et al., 1995).

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