Acineta fluviatilis Stokes, 1885

Medium sized, freshwater, loricate species that is pyriform to triangular in outline, strongly compressed laterally. The apical aperture is slit-like through which the two fascicle born upon lobe-like actinophores protrude. Actinophores independently contractile. Stalk of variable length, joining with lorica without any collar or cup-like region.

With centrally located spherical macronucleus and apical contractile vacuole. Reproduction by monogemmic endogenous budding (Curds, 1985a).

Dimensions: width of lorica 24–60; length of stalk 58–68; stalk diameter 5–7; macronucleus 10–14 x 15–45; length of the tentacles 18–30, diameter of contractile vacuole 6–8. Previous measurements: length 65; length of stalk 20–90.

Material examined. Found as epibiont of: Ranatra linearis . Ukraine. Small lake in high-water bed of Dnieper river (left bank) near Kiev, Ukraine. 0 8.01.1986. Horn of river Severskyi Donetc near village Cherkasskyj Bishkin’, Kharkov region. 10.08.1989. Naucoris cimicoides . Ukraine. Pond at left bank of river Southern Bug near village Selyscshe, Vinnitca region. 19.08.1988.

Additional records. On Vallisneria spiralis Linnaeus (Curds, 1985a) .