Genus Form
- Species total:
- 5
- Age range:
- 145 - 16.5 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Form magnificus | Early Eocene | Early Eocene |
|
| Form sp | Cretaceous | Early Tertiary |
|
| Form sp.A | Tithonian | Early Miocene |
|
| Form sp.A3 | Nd | Nd |
|
| Form vestibulum | Early Eocene | Early Eocene |
|