Nannotax Enabling nannofossil research

Description: Early Miocene group of large Helicosphaera species with weak wing, and broad central area.

Remarks:

Drawing	Outline descri ption	Range
	H. ampliaperta - open central area	NN2-4
	H. truempyi - central opening spanned by narrow disjunct bar	NP21-NN1
	H. scissura - central opening is elongate slit	NN3-4
	H. mediterranea - central opening spanned by narrow conjunct bar	NN2-4