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Frenopyxis stierlitzi
F. stierlitzi, from Bobrov and Mazei, 2020

Frenopyxis  Bobrov et Mazei, 2020

Diagnosis: Shell bilaterally symmetrical, broad elliptic, sometimes almost circular, dorsoventrally flattened, yellowish to colorless; aperture is placed slightly eccentrically on a ventral part of a shell at the bottom of a wide funnel (invagination); aperture usually drop-shaped with narrow side oriented toward closest side; sometimes aperture circular. There is an internal thick organic lip surrounding an aperture and continuing in a bridle, which connects an aperture with the internal side of a shell wall and broaden in the place of connection of a bridle and a shell wall.

Type species: Frenopyxis stierlitzi  Bobrov et Mazei, 2020

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