Acanthocystis antonkomolovi Leonov, 2010
Diagnosis: Cell diameter 20-22 µm. Periplast with tangential plate-scales and radial spine-scales of the same type. Spine-scales 5.9–7.0 µm long, branching into two teeth at the apex, each 0.4 µm long. The bases of the teeth are connected by a membrane. Shaft thickness 0.18-0.20 um. The basal plate is rounded, 0.8–1.0 µm in diameter. Elliptical plate-scales, 2.6-3.0 x 1.8-2.0 µm in size, ornamented with an axial ridge and numerous grooves extending from it (5-6 per 1 µm of the scale border).
Ecology: Fresh water. Mokhovoye bog, Voronezh region, Russia.
Remarks: Similar in shape to the spine-scales of A. turfacea (Carter 1863), in which the apex also branches in two teeth. However, in contrast to the latter, in A. antonkomolovi all spine-scales are of the same in length, there is no division into short and long. The short spine-scales of A. turfacea are 8-12 µm long, and the long ones are 25-45 µm long. Plate-scales of A. turfacea (3.5-5.5 x 8-12 µm) are textureless, while the plate-scales of A. antonkomolovi are ornamented with an axial ridge and numerous grooves.
