Raphidiophrys elegans
From Nicholls, 1983

Acanthocystis myriospina  Penard, 1890, emend. Nicholls, 1983

Diagnosis: Periplast 6-26 μm, average 10 μm. Two types of siliceous scales. Radial scales numerous, very thin and delicate, 2.5-16 μm, straight or slightly bent at the proximal part and sometimes very numerous. Shaft 0.15-0.18 μm thick at the base, hollow and narrowing upwards (0.10 μm). The apex is abruptly cut off with a minutely serrated margin. Apex with three teeth, 0.08-0.25 μm long. Each tooth is usually sharply pointed, sometimes slightly branched or thickened and rounded. Basal disc 0.5-0.7 μm in diameter, usually with a thickened edge, slightly conical, shaft in the center. Tangential scales 2.4 x 1.3-3.6 μm, round, elliptical or ovoid with thickened margin, 0.015-0.030 μm (in width, with not always clearly developed axial rib or fold.) Up to 8 contractile vacuoles.

Remarks: Nicholls: Although the edges of several plate-scales were seen around the borders of some dried specimens, none ofthe preparations resulted in a clear view of intact plate-scales.

Distribution: lakes and streams. Canada (Nicholls, 1983), Chile (Dürrschmidt, 1985), Netherlands (Roijackers, unpubl.).

Recent posts

Difflugia key bag-shaped

Tests that are bag or thumb-shaped Tests that are bag, finger or thumb-shaped.This group has no taxonomic significance. D. polliciformis D. lemani D. pecac D.

Read More »

Difflugia polliciformis

Difflugia polliciformis, after Van Oye, 1952 Difflugia polliciformis  Van Oye, 1958 Diagnosis: Test more or less thumb-shaped, without clear neck, chitinoid, mainly covered with very

Read More »

Difflugia australis

D. australis after Playfair, 1917 Difflugia australis (Playfair, 1917) Gauthier-Lièvre et Thomas, 1958 Syn.: Difflugia bacillariarum var. australis Playfair 1917 Diagnosis: Test broadly ovate, with

Read More »

Difflugia baradlana

D. baradlana after Varga, 1963 Difflugia baradlana Varga, 1963 Diagnosis: Test ovoid with a very small neck which is about 1/4 of the test length.

Read More »

Difflugia angelica

D. angelica after Gauthier-Lièvre et Thomas, 1960 Difflugia angelica Gauthier-Lièvre et Thomas, 1960 Diagnosis: Test spherical, slightly mammillated. Pseudostome regularly lobed like a star with

Read More »

Difflugia algaephila

D. algaephila after Decloitre, 1977 (l) and Chardez (1980) Difflugia algaephila Decloitre, 1977 Diagnosis: Test ovoid, neatly pointed, with oblique round pseudostome. Dimensions: Length 73-75

Read More »