Genus Schwabia Jung, 1942
Diagnosis: Shell ovoid, circular in cross-section, chitinous with small mineral particles which produce a smooth surface, aperture terminal.
Ecology: either freshwater or alkaline forest soils (S. terricola).
Type species: Schwabia irregularis Jung, 1942, Refs.: Bonnet and Thomas (1960), Chardez (1966).
Remarks: Jung describes this genus and species only based on empty shells and “while no living animals were observed, it is not known whether this amoeba belongs to Lobosa or Filosa”. Jung believed that this amoeba falls within the group of filose amoebae and is related to Pseudodifflugia. He mentions three diagnostic features:
1 shell is ovoid;
2 pseudostome is not invaginated and has a faintly thickened border;
3 more or less siliceous structure, but it is not clear what he exactly means by that.
The genus was named after G.H. Schwabe, who collected the samples in Chili and sent them to Jung. The samples with Schwabia came from a forest stream and pond, a moor and wet mosses.
I don’t think this genus belongs to the lobose amoebae. Nobody has ever seen living cells. I moved this genus to the Cercozoa, after observations of several similar shells which contained living cells.