H. cryptostoma – from Gauthier-Lièvre & Thomas, 1958
Genus Hoogenraadia Gauthier-Lièvre & Thomas, 1958
Diagnosis: Shell ovoid-globular, overhanging anterior visor often with 2 lateral grooves, incurved ventral lip. Ventral face rounded. Pseudostome more or less round, partly covered by the visor.
Type species. Hoogenraadia africana Gauthier-Lièvre & Thomas, 1958.
Seven species, six known from the tropics and one from Europe.
Habitat and distribution: Acid bogs and swamps and soils, tropical and sub-tropical. One species found in a wetland in the Netherlands (Siemensma, personal observation, 2019).
Distribution of Hoogenraadia (red), Planhoogenraadia (yellow) and Geoplagiopyxis (green) – modified after Smith et al. 2008.