Cyclopyxis kahli var. cyclostoma Bonnet & Thomas, 1960

Diagnosis: The type as defined by Deflandre, 1929, has an irregular, more or less jagged, contour due to irregular mineral particles overflowing the border of the aperture. The pseudostome of the variety cyclostoma is without such irregular and overflowing elements; it is not always circular, and often has an irregular contour, but not lobed. The connection of the side wall to the dorsal wall, visible during lateral observation, appears less clearly angular than in the type. Structure of the test wall similar to that of the type in general.

Dimensions: According to Bonnet and Thomas (1960): Shell diameter 80—100 µm; height 50—60 µm; pseudostome diameter 12—30 µm.

Ecology. Freshwater. Marshes, ponds, rhizosphere of Brachypodium rainosum on micaschists,

Geographical distribution: Near Paulilles (Pyrénées-Orientales). Algeria: marshes near La Calle and ponds of Reghaïa near Algiers (unpublished documents L. Gauthier-Lièvre).