Wallia
Wallidinellum
Wallodinium
Walvisia
Wanaea
Wanneria
Warrenia
Weiachia
Wervekodinium
Wetzeliella
Wetzeliella subgenus Apectodinium
Wetzeliella subgenus Rhombodinium
Wetzeliella subgenus Wetzeliella
Wetzeliopsis
Wigginsiella
Willeidinium
Williamsidinium
Wilsonidium
Wilsonisphaera
Wrevittia