Helios umbelliferum
- Citations total:
- 2
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| original | Emsian | Uruguay | PŠ¶the de Baldis,E.D. Additional Paleomicroplankton from the Lower Devonian of Uruguay. | 1977 | |
| details | Emsian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |