Clade Calycina Gregory 1900 (sea urchin)
Parent taxon: Carinacea according to A. Kroh and A. B. Smith 2010
See also Clark and Twitchell 1915, Donovan 1993, Jagt 2000, Smith 1991 and Smith 1995
Sister taxa: Hemicidaridae, Irregularia, Orthopsidae, Pseudodiadematidae
Subtaxa: Phymosomatoida Salenioida Salenocidaris
Ecology: slow-moving low-level epifaunal grazer