Author:
Rudavskaya,V.A.
Year:
1969
Title:
Palaeozoic Hystrichospheres.
Reference:
Rudavskaya,V.A. (1969) Palaeozoic Hystrichospheres. Fossil Algae of the USSR,(T.F.Vozzhennikova) P. 163- 168
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Genus Species Country(Region) From To
Vulcanisphaera Vulcanisphaera africana Africa(Sahara) Ordovician
Xanthidium Xanthidium Nd Nd