Ovum medium
- Citations total:
- 2
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| details | Nd | Nd | Eisenack,A. Hystrichospheres and related forms in the Baltic Silurian. | 1938 | |
| details | Silurian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |