Nannotax Enabling nannofossil research

Small to medium sized Miocene Helicosphaera species with wing ending flush with flange rather than terminating abruptly. Openings usuallly strongly oblique.

Drawing	Outlne desriotion	Range
	H. walbersdorfensis - small to medium sized,  pores oblique, wing well-ddevloped	NN5-7
	H. vedderi - like walbersdorfensis but but wing weaker and bar broader	NN2-5
	H. stalis - small, wing indistinct, pores oblique	NN6-11
	H. magnifica - closed central area, wing very broad	NN2-3