Protosphaeridium semiclausum
- Citations total:
- 3
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| details | Early Devonian | USSR(Siberia) | Kasperkevich,E.P. The age of the Kurei Formation, (Devonian, Northwest Siberian Platform. | 1978 | |
| details | Nd | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 | |
| original | Early Gedinnian | USSR(WSL) | Andreeva,E.M. Early and Middle Devonian spores from the Northeastern Slope of Salair. | 1973 |