| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Wellsotrochus | 1 | 0 | 0 |
| Wellsotrochus groenlandicus | 0 | 0 | 1 |
| Weyprechtia Stuxberg 1880 | 1 | 0 | 0 |
| Weyprechtia pinguis (Krøyer 1838) | 0 | 0 | 1 |
| Wildemania De Toni 1890 | 1 | 0 | 0 |
| Wildemania miniata | 0 | 0 | 2 |
| Woodsia | 2 | 0 | 0 |
| Woodsia glabella R. Br. ex Rich. | 0 | 0 | 1 |
| Woodsia ilvensis (L.) R. Br. | 0 | 0 | 1 |
| Woodsiaceae | 3 | 0 | 0 |
| Wordieoceras | 1 | 0 | 0 |
| Wordieoceras wordiei (Spath 1930) | 0 | 0 | 1 |
| Worthenia | 1 | 0 | 0 |
| Worthenia humilis | 0 | 0 | 1 |
| Wrangeliaceae | 0 | 0 | 0 |
