Subfamily Stylocidarinae Mortensen 1928 (pencil urchin)
Echinoidea - Cidaroida - Cidaridae
Parent taxon: Cidaridae according to S. Nisiyama 1966
Sister taxa: Centrocidaris, Cidarinae, Cidarini, Cidaris, Dorocidaris, Goniocidarinae, Hesperocidaris, Phyllacanthina, Prionocidaris, Rhabdocidarinae, Stereocidarinae, Triassicidaris
Subtaxa: Balanocidaris Firmacidaris
Ecology: slow-moving low-level epifaunal grazer-omnivore
Distribution: