PRAECYSTAMMINA Krasheninnikov, 1973

 

 

Type species: Praecystammina globigerinaeformis Krasheninnikov, 1973; OD.Praecystammina Krasheninnikov, 1973 (*1730), p. 211.

Test tiny, up to 0.27 mm in diameter, subglobose, streptospirally enrolled, with few chambers, commonly three per whorl, periphery broadly ovate; wall very finely aggluti­nated, surface smoothly finished; aperture areal, oval to slitlike, slightly above the base of the apertural face, and bordered by dis­tinct lip. U. Cretaceous (Santonian to Cam­panian); NW Pacific in deep-sea cores.