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Choanocystis rossica (Mikrjukov, 1995)

Diagnosis: Cells are 14–26 µm in diameter with plate-scales and one type of spicules in the periplast. Spicules are 3-7 µm long; the shaft is hollow, cylindrical, in the average, 0.5 µm thick in the base, is tapered in the direction of a cut off apex, which lacks marginal teeth; the base-plates is heart-shaped with straight edges. Plate-scales are from elliptical to elongated, in the average, 3.0 x 1.7 µm, flat, patternless, sometimes with more or less well-developed medial constriction.

Ecology: Freshwater. Russia, Estonia.

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Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

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Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

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Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

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Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

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Kinetocyst

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Yogsothoth carteri

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