P. gracilis – from Bonnet, 1977
Genus Planhoogenraadia Bonnet, 1977
Diagnosis: Shell bilaterally symmetrical; aperture more or less covered by a visor-like extension of the dorsal surface, 2 lateral grooves at the junction of visor and belly. In contrast to Hoogenraadia ventral side always flat; this is interpreted as an adaptation to the living in soil as in Plagiopyxis or certain Centropyxis. Pseudostome usually semi-circular or elongated oval, located back into the test.
Type species: Planhoogenraadia acuta Bonnet, 1977.
Eight species.
Ecology: forest soils often on calcareous bedrock.
Distribution of Hoogenraadia (red), Planhoogenraadia (yellow) and Geoplagiopyxis (green) – modified after Smith et al. 2008.
P. alta – from Bonnet, 1984
P. acuta – from Bonnet, 1977
P. bonneti
P. cantabrica – from Bonnet, 1984
P. asturica – from Bonnet, 1984
P. gibbosa – from Bonnet, 1984
P. elegans
P. gracilis – from Bonnet, 1984