Author:
Fensome,R.A.;Williams,G.L.;Barss,M.S.;Freeman,J.M.;Hill,J.M.
Year:
1990
Title:
Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa.
Reference:
Fensome,R.A. et al. (1990) Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. American Association of Stratigraphic Palynologists, Contributions Series # 25 P. 1- 771
Google Academy:
try to search by title in english
Genus Species Country(Region) From To
Helosphaeridium Helosphaeridium echiniforme Nd Llandoverian
Helosphaeridium Helosphaeridium guttatum Nd Frasnian
Helosphaeridium Helosphaeridium latispinosum Nd Ludlovian
Helosphaeridium Helosphaeridium malvernense Nd Wenlockian
Helosphaeridium Helosphaeridium microclavatum Nd Frasnian
Helosphaeridium Helosphaeridium pseudodictyum Nd Wenlockian Ludlovian
Helosphaeridium Helosphaeridium rarum Nd Arenigian
Hemibaltisphaeridium Hemibaltisphaeridium Nd Nd
Hemibaltisphaeridium Hemibaltisphaeridium dedosmuertos Nd Ludlovian
Hemideunffia Hemideunffia Nd Nd
Hemideunffia Hemideunffia trifurcata Nd Wenlockian
Hemisphaerium Hemisphaerium Nd Nd
Hemisphaerium Hemisphaerium germanum Nd Early Carboniferous
Hemisphaerium Hemisphaerium inominatum Nd Early Carboniferous
Hemisphaerium Hemisphaerium novum Nd Early Carboniferous
Hemisphaerium Hemisphaerium punctatum Nd Early Gondwana
Hemisphaerium Hemisphaerium signum Nd Early Carboniferous