Nannotax Enabling nannofossil research

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.

Variant: H. elongata Theodoridis, 1984 - more elongate and with more rectangular outline.