Schewiakoff, 1926
Order is divided into two suborders on basis of shape and arrangement of spicules in their basal region. Endoplasm always containing numerous zooxanthellae. Contrary to three other orders of Acantharia, gametogenesis occurs in a gamont which keeps the aspect of the trophont. Whole endoplasm converted into biflagellate gametes which are shed across capsular wall at maturity.
Suborder Sphaenacantha Schewiakoff, 1926
Family Acanthometridae
Family Dorataspidae
Family Phractopeltidae
Family Diploconidae
Family Lithopteridae
Family Hexalaspidae
Suborder Phyllacantha Schewiakoff, 1926
Family Phyllostauridae
Family Stauracanthidae
Family Dictyacanthidae