Description: Large Helicosphaera with flange ending in a wing. Rather diffuse blanket image in XPL and closed central area or two narrow near-longitundinal slits.
Remarks: Similar to Neogene Helicosphaera carteri, hence the previous informal designation as Helicosphaera aff. H. carteri by de Kaenel & Villa (1996), but its stratigraphic range is distinctly different and the wing is somewhat less strongly developed.
Range: NP23 to NP24.