Cyclopyxis-lithostoma
C. lithostoma, – from Bonnet, 1974

Cyclopyxis lithostoma Bonnet, 1974

Diagnosis: Test large, more or less dark brownish, in dorsal view circular. In side view, ventral sole very individualized. Height approximately 2/3 of shell diameter. Transition between dome and sole arc-shaped, not angular. In ventral view, pseudostome at the end of a shallow conical depression. Aperture very irregular, lined with large siliceous elements arranged without order on the ventral sole. These elements sometimes narrow the aperture almost completely.
In some individuals, the depression has only small elements embedded in a brownish chitinoid cement. Test covered with a mixture of elements, partly exogenous (quartz fragments) and partly endogenous (amorphous siliceous particles reworked into irregular shaped platelets). Within the test, the periphery of the ventral sole comprises in some individuals an annular chitinoid dark brown reinforcement, sometimes inconspicuous.

Dimensions: Bonnet: Ø average: 152 µm; SD: 6 µm. (n=20).

Ecology: Common species in upland savanna soils in the grass root zone (Loudetia, Hyparrhenia).

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 »