Genus Micrhystridium
- Species total:
- 558
- Age range:
- 4100 - 0 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Micrhystridium rarispinum | Paleozoic | Neocomian |
|
| Micrhystridium raspum | Tremadocian | Emsian |
|
| Micrhystridium rectangulare | Late Devonian | Late Devonian |
|
| Micrhystridium recurvatum | Paleozoic | Early Pleistocene |
|
| Micrhystridium reductum | Jurassic | Jurassic |
|
| Micrhystridium regulare | Late Precambrian | Early Cambrian |
|
| Micrhystridium remotum | Ordovician | Silurian |
|
| Micrhystridium resistens | Middle Cambrian | Arenigian |
|
| Micrhystridium reticornum | Nd | Nd |
|
| Micrhystridium reticulatum | Late Cretaceous | Middle Miocene |
|
| Micrhystridium rhachos | Middle Jurassic | Middle Jurassic |
|
| Micrhystridium rhopalicum | Paleozoic | Early Callovian |
|
| Micrhystridium rigidum | Triassic | Cretaceous |
|
| Micrhystridium robustum | Early Paleozoic | Middle Emsian |
|
| Micrhystridium roquestii | Paleozoic | Bathonian |
|
| Micrhystridium salopiense | Late Llandoverian | Downtonian |
|
| Micrhystridium sannemannii | Late Ordovician | Silurian |
|