Genus: Locomotive form elongate, cylindrical; anterior hyaline cap always presents; posterior end narrowed; dorsal surface wrinkled; monopodial locomotive form 60-275 micron; L/B 1.4 - 10.5; cytoplasm highly vacuolated.

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P. proteoides 315 x 80 μm Shirakawa Fukushima, 1999 Movies	P. proteoides ? μm Kaga Ishikawa, 2000	P. proteoides ? μm Kabuto-yama Nishi-no-miya Hyogo, 2004	P. proteoides ? μm Yukawa-numa Nishiwaga Iwate, 2007

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