Cyphoderiidae

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Genus Campascus

Shell is broadly ovoid; in cross-section circular, ovoid or triangular. Neck is cylindrical, curved. Fundus is rounded or with up to three projections. Aperture is circular, surrounded by a characteristic hyaline collar. Composition of the shell is variable; some species have circular, other amorphous, siliceous scales sometimes mixed with mineral particles, usually not regularly arranged. Ecology: freshwater and marine. Type species: Campascus cornutus Leidy, 1879

Genus Corythionella

Shell is ovoid, dorso-ventrally compressed; fundus is rounded. Aperture is circular, located on the ventral side, surrounded by large circular collar. Shell is covered with elongate, siliceous idiosomes, irregularly arranged as in Corythion, the plates of the collar are smaller (Nicholls, 2009b). Ecology: marine and freshwater interstitial. Type species: Corythionella pontica Golemansky, 1970

Genus Cyphoderia

Shell is retort-shaped laterally; ovoid in ventral and dorsal views, usually circular in cross-section, sometimes slightly compressed. Fundus is round or tapered to mammillate tip. Aperture is circular without a collar. Shell is covered by small circular or triangular plates, either adjoining or overlapping on organic matrix depending on species. Endoplasm contains refractive grains. Ecology: marine interstitial, freshwater and moss. Type species: Cyphoderia ampulla (Ehrenberg, 1840) Leidy, 1879

Genus Messemvriella

Shell is retort-shaped laterally, ovoid in ventral and dorsal view, circular in cross section. Fundus is round. Shell is covered with regularly overlapping siliceous scales. Aperture is subterminal, circular, surrounded by a collar, which is less developed than in Corythionella. Ecology: marine interstitial. Type species: Messemvriella filose Golemansky, 1972

Genus Pseudocorythion

Shell is ovoid in ventral view, tapering at both ends, slightly flattened dorso-ventrally. Fundus carries a small pointed spine of variable length. Shell is covered with small or oval overlapping plates which are randomly arranged. Aperture is located on the ventral side; surrounded by a large circular collar of the same size as the maximum breadth of the shell. Outer edge of the collar is with very thin organic rim. Ecology: marine interstitial. Type species: Pseudocorythion acutum (Wailes, 1927)

Genus Schaudinnula

Shell is retort-shaped ventrally, neck is bent more or less, fundus is pointed; cross-section is triangular. Shell is covered with circular overlapping idiosomes forming hexagonal structure. Aperture is circular, without a hyaline collar. Ecology: freshwater. Type species: Schaudinnula arcelloides Awerintzew, 1907

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