Genus Obligate tetrad
- Species total:
- 1
- Age range:
- 387 - 378.33 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Obligate tetrad | Early Siegenian | Middle Siegenian |
|
Genus Obligate tetrad
- Species total:
- 1
- Age range:
- 387 - 378.33 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Obligate tetrad | Early Siegenian | Middle Siegenian |
|