Protosphaeridium britoi
- Citations total:
- 2
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| original | Arenigian | Llanvirnian | Brazil(Amazonas) | de Quadros,L.P. Occurence of Ordovician microfossils (Acritarchae) in the Alto Amazon Sub Basin, Brazil. | 1986 |
| details | Arenigian | Llanvirnian | Brazil(Amazonas) | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |