BISPHAERA Birina, 1948

 

 

Type species: Bisphaera malevkensis Birina, 1948; OD.

Bisphaera Birina. 19481'243), p. 159.

Test subglobular to pyriform, may have constriction suggesting a tendency to divide; wall single layered, of finely granular calcite, perforate; no aperture observed. M. Devonian to L. Carboniferous; USSR.