Cortical shell composed of 6 hemispherical cupolas, opposite in pairs on the poles of 3 mutually perpendicular axes. Variously shaped "central chamber" with or without enclosed small medullary shell. Diameter: ca. 150 µm.
Ref.: Haeckel (1887).
Cubotholus spp. group
Kingdom Protoctista Phylum Actinopoda Subphylum Sarcodina Class Polycystina Order Spumellaria Family Tholoniidae Genus Cubotholus Species Cubotholus spp.