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Family Acanthocystidae Claus, 1874, emend. Cavalier-Smith & Von der Heyden, 2007

Diagnosis: Periplast with two or three types of siliceous scales, a basal layer of typically oval plate scales (usually without an inrolled hollow edge; only exception Raphidocystis) and an outer layer of radial funnel-shaped siliceous scales and/or radial needle-like scales sometimes apically branched and/or with a peltate radially symmetrical basal disc lacking a lateral indentation (unlike Choanocystis radial scales). Exclusively freshwater, except perhaps occasionally for R. tubifera.
Type genus Acanthocystis.

Included genera:
Acanthocystis  (18 spp. mostly freshwater; 2 marine).

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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

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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