BIGENERINA d'Orbigny, 1826

 

 

Type species: Bigenerina nodosaria d'Orbigny, 1826; SD Cushman, 1911 (*702), p. 27.

Bigenerina d'Orbigny, 1826 (*2303), p. 261.

Test elongate, early stage biserial, later abruptly becoming uniserial; wall agglutinated, canaliculate; aperture basal in biserial stage, becoming terminal, rounded, and areal in the uniserial stage. Eocene to Holocene; cosmopolitan.