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Hystrichosphaeropsis

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Age range (in million years)

Min

Max

Image	Name	Original Description
	*arctica*	Matsuoka, K. and Bujak, J.P. (1988)
	borussica	Eisenack, A. (1954b)
	*complanata*	Eisenack, A. (1965)
	*costae*	Bujak, J.P. (1994)
	downiei	Pocock, S.A.J. (1972)
	forficata	Slimani, H. (1994)
	*galeata*	Cookson, I.C. and Eisenack, A. (1960a)
	*irisiae*	Kjellström, G. (1973)
	jubata	May, F.E. (1980)
	minimum	Zevenboom, D. (1995)
	nuda	Wetzel, O. (1961)
	*obscura*	Habib, D. (1972)
	*ovum*	Deflandre, G. (1935)
	ovum sensu chateauneuf 1980	Chateauneuf, J.-J. (1980)
	*perforata*	Schioler, P. (1993)
	*pontiana*	Baltes, N. (1969)
	*quasicribrata*	Wetzel, O. (1961)
	*rectangularis*	Bujak, J.P., Downie, C., Eaton, G.L. and Williams, G.L. (1980a)
	*somphosa*	Warny, S.A. and Wrenn, J.H. (1997)
	sp. 1 of heilmann-clausen 1989	Heilmann-Clausen, C. and Costa, L.I. (1989)
	tubulata	Wetzel, O. (1961)
	*variabilis*	Matsuoka, K. and Bujak, J.P. (1988)
	wetzelii	Deflandre, G. (1937b)