Pterotosphaerula
- Citations total:
- 2
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| original | Late Ludlovian | Early Gedinnian | Spain | Cramer,F.H. Palynology of Silurian and Devonian rocks in northwest Spain. | 1966 |
| details | Nd | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |