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

Microcorycia spec. 4

Microcorycia spec. , folded Microcorycia spec.? I found this specimen in a sample from moss on a fallen tree in a marsh in the Naardermeer,

Read More »

Microchlamys spec.

Microchlamys spec., the same cell in lateral view Microchlamys spec. Diagnosis: Shell relatively high compared with all described species. The diameter is twice the height.

Read More »

Excentrostoma

Infraorder Excentrostoma Kosakyan et al., 2016   Diagnosis: Testate amoebae with an eccentrically placed aperture; test organic with few or many xenosomes. Family Centropyxidae Jung, 1942  

Read More »

Longithecina

Infraorder Longithecina Kosakyan et al., 2016   Diagnosis: Testate amoebae with a more or less tubular or cylindrical test and a terminal aperture; test with

Read More »