(Ophiaster) (Ophiaster) is a biological genus in the family Syracosphaeraceae and order Prymnesiales.
Ophiaster hydroideus
Acanthoica
Anthosphaera
Calciopappus
Calciosolenia
Calyptrosphaera
Corisphaera
Cricosphaera
Crystallolithus
Helladosphaera
Hymenomonas
Lohmannosphaera
Michaelsarsia
Ophiaster
Pleurochrysis
Pontosphaera
Sphaerocalyptra
Syracolithus
Syracosphaera
Zygosphaera