Genus Williamsonia
- Species total:
- 9
- Age range:
- 195 - 1.8 MA (obsolete dating)
- IRMNG:
- find
| Name | From | To | Age range |
|---|---|---|---|
| Williamsonia himas | Jurassic | Jurassic |
|
| Williamsonia pecten | Jurassic | Neogene |
|
| Williamsonia lignieri | Jurassic | Jurassic |
|
| Williamsonia whitbiensis | Jurassic | Jurassic |
|
| Williamsonia | Jurassic | Dogger |
|
| Williamsonia gigas | Jurassic | Jurassic |
|
| Williamsonia spectabilis | Jurassic | Jurassic |
|
| Williamsonia setosa | Jurassic | Jurassic |
|
| Williamsonia sp | Aalenian | Neogene |
|