Centropyxis ventricosa Bartos, 1963

Diagnosis: Shell large, broad and grey-coloured, made of coarser mineral fragments. Much larger pieces of stone can be found particularly on the dorsal side and at the rear end of the shell. The shell opening part of the shell is relatively low and almost the same height, the actual rear part of the shell suddenly bulges out very high. The edge of the shell opening is very wide and covered with two rows of larger, flat stone fragments, of which the inner row of stone fragments with the sharp corners of the mineral fragments runs into the shell opening space and thus forms the teeth on the edge of the shell opening. The front edge of the shell opening is very highly arched, the rear edge is cut off straight, but the belly surface of the shell begins to deepen long before the edge mentioned. This depression is covered with much finer material. Behind the almost semicircular shell opening section, the shell is very clearly constricted, as is usual with C. platystoma. The actual shell section that follows is very widened.

Dimensions: Length 100 µm (of which 27 µm are for the shell opening section and 73 µm for the actual shell section). In the constriction the shell is only 60 µm wide, slightly less than the width of the shell opening (63 µm). The greatest width of the actual shell reaches 78 µm. At the front the shell is about 25 µm thick, the greatest thickness is 71 µm. Aperture 38 µm wide and only 16 um high. The edge of the shell opening is 11 µm wide.

Habitat: Mosses.

Geographical distribution: Java, Indonesia.