Haeckel, 1862
Twenty spicules of same shape and generally same length, with two to four cross-shaped ramified processes or five to six angular porous plates linking to form latticed or armored shell. Conical bases of spicules linked or closely associated, forming mass in cell center. Cell body spherical, with yellow or red endoplasm, surrounded by capsular wall. Ectoplasm with numerous zooxanthellae. Periplasmic cortex covering ectoplasm and linked to spicules by 6-16 myonemes.
Eleven genera:
Genus Aconthaspis
Genus Coscinaspis
Genus Craniaspis
Genus Dictyaspis
Genus Dorataspis
Genus Hystrichaspis
Genus Icosaspis
Genus Lychnaspis
Genus Pleuraspis
Genus Siphonaspis
Genus Stauraspis