Family Plagiopyxidae

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Genus Bullinularia

Shell is ovoid or circular in front view, hemispherical with flattened ventral surface in lateral view; covered by small mineral particles in sheet-like organic cement, smooth, dark brown and opaque. Aperture is eccentric, invaginated, completely or partially hidden by the dorsal apertural lip (cryptostome). A key character is the pores on the dorsal lip, on the apex and, depending on the species, on the ventral side. Ecology: soils, mosses. Type species: Bullinularia indica (Penard, 1907)

Genus Geoplagiopyxis

Shell is ovoid in frontal view, hemispheric in lateral view; ventral surface slightly vaulted; dorsal face curving below the convex ventral face. Aperture is not easily visible as an irregular slit. Shell composed of amorphous plates without larger mineral particles. Ecology: soil. Type species: Geoplagiopyxis declivis Chardez, 1961

Genus Hoogenraadia

Shell is ovoid-globular, overhanging anterior visor with two lateral groves, incurved ventral lip; covered by xenosomes. Ventral face circular. Aperture is more or less circular, partly covered by visor. Ecology: tropical bogs, swamps, soils. Type specie: Hoogenraadia africana Gauthier-Lièvre et Thomas, 1958. Note: Chardez (1963) has erected a similar perhaps synonymous genus Gillardella, which has a much smaller visor.

Genus Paracentropyxis

Shell is circular or slightly elliptical in frontal view; at the dorsal face, a groove separates the reminder of the shell from a small visor in from of tapered crescent. Ventral surface is concave; at median level the visor is rounded, forming a buccal cavity, ventral face and the side walls of this vestibulum are connected to the dorsal part of the shell; with small internal opening as in Centropyxis sylvatica. The slit-like aperture is hidden by the dorsal lip and an extension of the ventral shell wall (cryptostomia). Shell transparent and composed of exogenous mineral particles, which are embedded in a hyaline cement. Ecology: tropical soils. Monospecific. Type species: Paracentropyxis mimetica Bonnet, 1960. Note: Dekhtiar (2009) placed the genus Paracentropyxis in the family Centropyxidae with species Paracentropyxis sylvatica (Deflandre, 1929) Dekhtiar, 2009 (basionym Centropyxis sylvatica Deflandre, 1929) and Paracentropyxis matthesi (Rauenbusch, 1987) Dekhtiar, 2009 (basionym Centropyxis matthesi Rauenbusch, 1987).

Genus Plagiopyxis

Shell is circular of oval in frontal view, hemispheric in lateral view. Aperture is elongate slit, perpendicular to long axis of the shell; dorsal aperture lip somewhat incurved usually hiding the opening. Ecology: most of the species are edaphobionts (soil-inhabited), some freshwater. Type species: Plagiopyxis declivis Bonnet et Thomas, 1955

Genus Planhoogenraadia

Shell is ovoid in frontal view, hemispheric with flat ventral surface and a visor-like extension separated by two groves from the mina body of the shell in lateral view. Aperture is semicircular or elongated oval, located back into the shell, partly covered by the visor-like extension of the dorsal surface. Ecology: soils. Type species: Planhoogenraadia acuta Bonnet, 1977

Genus Protoplagiopyxis

Shell is ovoid in frontal view, hemispheric with anterior flattening in lateral view; covered by extraneous mineral particles. Ventral surface is flattened very clearly and slightly or not inclined. Aperture is a straight or crescent-shaped slit of “plagiostome” type with tendency to “cryptostome” (aperture located inside the shell), no vestibule, but apertural region is well separated by fairly abrupt dorso-ventral depression in the anterior part. Ecology: soils. Type species: Protoplagiopyxis delamarei Bonnet, 1962

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