Difflugia lismorensis
Difflugia lismorensis, after Gauthier-Lièvre et Thomas, 1958

Difflugia lismorensis Playfair, 1917

Diagnosis: Test broadly ovate or subglobose, composed of coarse flints closely disposed, or of flat plates of irregular shape. Dome broadly rounded, without processes. Pseudostome 6-lobed, without any distinct, regular edging of flints or plates, lobes very deep, ovate, narrowed within, rounded or somewhat flattened behind, the angles between the lobes thrust forward into the orifice as broad, blunt processes, leaving only a clear space equal to about one-third of the diameter of the orifice. The tips of these processes are chitinous, and so darkened that, if they are composed of small flints or plates, the latter cannot be seen (after Playfair, 1917). Gauthier-Lièvre et Thomas (1958) distinguish some subspecies: var. quinqelobata and var. elongata.

Dimensions: Length 115-150 µm; width 100-133 µm; pseudostome 25-28 µm.

Ecology: Freshwater, Lismore, Australia (Playfair, 1917); Africa (Gauthier-Lièvre et Thomas, 1958).

Remarks: I found this species in 1978 in a ditch in Ankeveen, the Netherlands, but it was only a single test and much smaller.

Difflugia cf lismorensis, 84 µm – Netherlands
Recent posts

Centropyxis declivistoma

Centropyxis declivistoma, after Chardez, 1990 Centropyxis declivistoma Chardez, 1990 Diagnosis: Test ovoid, slightly compressed dorso-ventrally, especially in the anterior region, embedded with polymorph mineral platelets. Pseudostome

Read More »

Plagiopyxis bicamera

Plagiopyxis bicamera, after Coûteaux, 1978 Plagiopyxis bicamera Coûteaux, 1978 Diagnosis: Test elongated, in ventral view elliptical, dorso-ventrally compressed, colorless or yellowish, with a cryptostome with visor.

Read More »

Arcella jurassica

Arcella jurassica, after Olivier, 1944 Arcella jurassica Olivier, 1944 Diagnosis: Test pyramid-shaped but strongly truncated, in lateral view trapezium-shaped, with 5-8 planes; pseudostome surrounded by

Read More »

Assulina discoides

Assulina discoides , after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bobrov, Shimano and Mazei, 2012 Diagnosis: Shell large in size, disc shaped, colorless, transparent,

Read More »

Deharvengia

Deharvengia japonica, after Bobrov, Shimano and Mazei, 2012 Genus Deharvengia Bonnet, 1979, emend. Bobrov, Shimano and Mazei, 2012 Diagnosis: Test transparent, oval or ovoid in

Read More »