Parechinus Mortensen 1903 (sea urchin)
Parent taxon: Echinoidea according to B. Kensley 1972
Sister taxa: Acrosalenioida, Archaeocidaridae, Bromidechinus, Cassiduloidea, Cidarites, Cidaroidea, Diplocidaroida, Disasteroida, Dysaster, Echinocrinus, Echinoida, Euechinoidea, Gnathostomata, Hemicidaroidea, Oligopygoida, Perischoechinoidea, Radiolus, Regularia, Temnopleuroida
Subtaxa: Parechinus angulosus
Ecology: epifaunal grazer-deposit feeder