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Choanocystis rotoairense (Dürrschmidt, 1987) Mikrjukov, 1995

Diagnosis: Periplast is 38–50 µm (cells 10–15 µm) in diameter with plate-scales and one or two types of spicules. Spicules are 14–18 µm long, with the not tapering cylindrical shaft, terminating in a cut off apex bearing four marginal teeth. Some isolates demonstrate the spicules of two sizes; the long spicules are twice longer the short ones. Plate-scales are oval, 4.5–5.0 x 2.5–3.0 µm, patternless.

Ecology: Freshwater, occasionally brackish and marine waters. Europe, New Zealand. In brackish and marine waters: the Black Sea, the Baltic Sea, Antarctic waters.

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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

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

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Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

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