Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942
Zivkovicia compressoidea (Jung, 1942) new.comb. (my proposal)
Basionym: Pontigulasia compressoidea Jung, 1942
Diagnosis: Shell ovoid and compressed, without any constriction between neck and body.
Dimensions: Jung (1942): Length 173-185 µm; breadth 105 µm, diameter of aperture 38-40 µm. Chardez (1958): Length 190 µm. My measurements: 158-230 µm.
Ecology: Fresh water.
Geographical distribution: Chili, Belgium, Netherlands, Germany, Japan.
Z. compressoidea, 158 µm (Naardermeer, the Netherlands, 2021) and 188 µm (Japan, 2024)
Z. cf compressoidea, a-b the same shell (223 µm), c damaged shell (230 µm); Germany, collected by Wolfgang Bettighofer, 2021