Fragilidium is a genus of dinoflagellates belonging to the family Pyrocystaceae.^[1]

Fragilidium
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	SAR
Clade:	Alveolata
Phylum:	Myzozoa
Superclass:	Dinoflagellata
Class:	Dinophyceae
Order:	Pyrocystales
Family:	Pyrocystaceae
Subfamily:	Helgolandinioideae
Genus:	Fragilidium Balech ex Loeblich III

Species:^[1]

• Fragilidium duplocampanaeforme Nézan & Chomérat
• Fragilidium fissile Balech
• Fragilidium heterolobum Balech ex Loeblich III
• Fragilidium lacustre (Lindemann) Balech
• Fragilidium mexicanum Balech
• Fragilidium subglobosum (Stosch) Loeblich III