Neogene: Helicosphaera; Helicosphaera perch-nielseniae
Paleogene: Helicosphaera perch-nielseniae
Helicosphaera perch-nielseniae (Haq, 1971) Jafar and Martini, 1975 [Helicopontosphaera]
Description: Like H. obliqua but pores narrower and shape more oblong, less spindle-like (N.B. criteria for separating H. obliqua and H. perch-nielseniae vary between authors).
Range: NP23 to NN6.
Original description:
Variant: H. elongata Theodoridis, 1984 - more elongate and with more rectangular outline.
Neogene: Helicosphaera perch-nielseniae; Pontosphaera
Paleogene: Helicosphaera perch-nielseniae; Pontosphaera