Retirotundia
- Citations total:
- 2
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| original | Middle Oligocene | Germany | Krutzsch,W. Atlas of the Middle and Upper Tertiary dispersed spores and pollen as well as the mikroplankton forms of northern central Europe. VII: Monoporate, monocolpate, longicolpate dicolpate an dephedroide (polyplicate) pollen forms. | 1970 | |
| details | Middle Oligocene | Germany | Zippi,P.A. Freshwater algae from the Mattagami Formation (Albian) Ontario: Paleoecology, botanical affinities and systematic taxonomy | 1998 |