Acanthocystis clavata
From Siemensma, 1991

Acanthocystis clavata Dürrschmidt, 1987

Diagnosis: Periplast, 25-30 µm, in diameter (measurement based on whole mount); details of protoplast unknown. There are two types of scales: plate scales and nail-like spine scales. Plate scales, 1.3 X 0.77 µm, are elliptical and slightly curved or ovoid. They are thin and patternless, except for a poorly developed central thickening. Spine scales, up to 10  µm long, straight or moderately curved, with a circular base­plate, 0.4 µm in diameter. Shaft presumably solid, slightly narrowing to a thin, but blunt apex.

Ecology: Freshwater, from Banado Cruces, Chili.

Remarks: There is a certain similarity between A. clavata and A. spinifera Greeff (1869) as regards size and shape of cells and spine scales. Investigations by Nicholls (1983) and Dürrschmidt (1985) have revealed that there are several species of almost identical light microscopic appearance, which is why an identification of A. clavata with A. spinifera appears rather arbitrary. With an electron microscope A. clavata can be easily recognized by the shape of the spine scales. It is distinguished from all other so far known Acanthocystis species by its tapering shaft and closed apex.

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 »