Prototrachysphaeridium speciosum
- Citations total:
- 2
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| details | Early Cambrian | USSR(Yakut ASSR) | Popova,Z.P. et al. Organic remains in Petroleum of the Markovo Field | 1965 | |
| details | Nd | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |