overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Description: Helicosphaera with relatively wide central area spanned by a broad tranverse to slightly-oblique disjunct bar and a flange that ends in a spur.
Remarks:
Range: NP17 to NP21.
Neogene: Helicosphaera
Paleogene: Helicosphaera wilcoxonii