Family Centropyxidae

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Genus Armipyxis

Shell is ovoid, flattened in the lateral view. Aperture is wide, invaginated and slightly eccentric. Anterior walls of the aperture attach to the dorsal side with several appendages creating a complex system of inner partitioning. Shell may or may not be ornamented with spines of varying number and length. Type species: Armipyxis disoides Dekhtiar, 2009 (basionym Centropyxis discoides Penard, 1902). The genus also includes A. mirabilis (Bartoš, 1940) Dekhtiar, 2009 (basionym Centropyxis mirabilis Bartoš, 1940) and A. gasparella (Chardez et Beyens, 1988) Dekhtiar, 2009 (basionym Centropyxis gasparella Chardez et Beyens, 1988)

Genus Centropyxis

Shell is circular, irregular circular of ovoid in apertural (or dorsal) view, flattened in the area of the aperture in lateral view. Aperture is located on ventral side, invaginated, eccentric, circular to ovate. The shell is colorless to brown and may or may not be covered by agglutinating material, which varies from mineral grains to organic debris, particularly diatom frustules. Shell may or may not be ornamented with spines of varying number and length. Ecology: freshwater, moss. Type species: Centropyxis aculeata (Ehrenberg, 1838) Stein, 1857

Genus Conicocassis

Two-component shell comprised of an ovoid to subspherical main body and a relatively very large conical to funnel-like and asymmetrically positioned flange extending out from a small circular aperture. The lower shell body of Conicocassis is ovoid or subspherical to spherical with a wall composed of polymorphous mineral particles within an organic matrix. The colorless to brown main shell body is topped by a cone-like flange, which extends out from a small circular aperture. The cone-like flange is mostly embossed with broken, or intact, diatoms frustules and quartz particles, and appears to be nearly as large as the main shell body if observed from the apertural view. In some cases, the flange may be characterized by coloration distinct from the main shell body. The attachment area of the apertural flange to the main shell body produces a pronounced constriction in the shell wall that is particularly diagnostic (Nasser, Patterson, 2015). Ecology: freshwater, wet moss. Type species: Conicocassis pontigulasiformis (Beyens et Chardez, 1986).

Genus Proplagiopyxis

Shell is ovoid in frontal view, hemispheric with a slight slope to the aperture in lateral view, brown, xenosomes lacking or rare. Aperture is eccentric, circular, no invagination. Ecology: soil. Monospecific. Type species: Proplagiopyxis nuda Schönborn, 1964

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