Acanthocystidae – Microworld

Acanthocystidae Claus, 1874, emend. Cavalier-Smith and 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). Mostly freshwater, esome marine.
Type genus Acanthocystis.

Included genera:
Acanthocystis (28 spp. mostly freshwater; 2 marine).
Pseudoraphidocystis

Ferry Siemensma
Created March 2, 2019
Last updated January 31, 2021

Difflugia new species

April 16, 2021

Difflugia sp. nov. 273-307 µm Difflugia sp. nov. Diagnosis: Shell elongated oblong, usually with a distinct neck, composed of much smaller particles than the rest

Euglypha bryophila

March 18, 2021

Euglypha bryophila, after Brown, 1911 (L), from Ecuador (R) Euglypha bryophila Brown, 1911 Diagnosis: (Original description) The test is very regular in form and subject

Vernalophrys

March 10, 2021

(A) A Scenedesmus cell (arrow) is engulfed by a trophozoite. (B) Several Scenedesmus cells adhere to the surface of a plasmodium that has numerous vacuoles

Actinosphaeridium spec.

February 24, 2021

Actinosphaeridium spec. Diagnosis: Cell surrounded by a membranous shell, with an outer mucous layer. Filopodia with granules, sometimes branching. Cell stalked. Ecology: I found this

Euglyphidion

February 24, 2021

Euglyphidion enigmaticum – after Bonnet, 1960 Genus Euglyphidion Bonnet, 196 Diagnosis: Shell hyaline, ovoid, pseudostome circular or slightly elliptical. Shell loosely covered with two types of

Leptomyxa spec.

February 16, 2021

Leptomyxa sp., slowly retracting in response to the light of the microscope Leptomyxa sp. Diagnose: This is a very large amoeba which I found in

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