†suborder Meridosternata Lovèn 1883 (sea urchin)
Not given an explicit rank, but below order; treated as suborder in WoRMS
Full reference: S. Lovèn. 1883. On Pourtalesia, a genus of Echinoidea. Kongelige Svenska Vetenskaps-Akademiens Handlingar, new series 19(7):1-95
Parent taxon: Holasteroida according to A. Kroh and A. B. Smith 2010
Sister taxa: Calymnidae, Coraster, Corechinus, Coryslus, Eoholaster, Hemipneustidae, Menuthiaster, Nordenskjoeldaster, Physaster, Pomaster, Pseudholaster, Pseudholasteridae, Smithiaster, Stenonasteridae, Turanglaster
Subtaxa: Cardiasterina Echinocorythidae Holasteridae Urechinina
Ecology: semi-infaunal detritivore