- Williamsonianthus
- Williamsonianthus keuperianus
- Williamsoniella coronata
- Williamsoniella lignieri
- Williamsoniella minima
- Williamsoniella papillosa
- Williamsoniella sp
- Williamsoniella valdensis
- Willipollis
- Willipollis sp
- Willipollis westphalensis
- Willsiostrobus
- Willsiostrobus acuminatus
- Willsiostrobus bromsgrovensis
- Willsiostrobus cordiformis
- Willsiostrobus cylinricus
- Willsiostrobus denticulatus
- Willsiostrobus latisaccus
- Willsiostrobus ligulatus
- Willsiostrobus rhomboidalis
- Willsiostrobus willsii
- Wilsonastrum
- Wilsonastrum colonicum
- Wilsonastrum sp
- Wilsonia
- Wilsonia brevisacculatus
- Wilsonia delicata
- Wilsonia grancyi
- Wilsonia granulata
- Wilsonia gulafera