†order Hemicidaroidea Beurlen 1937 (sea urchin)
Alternative spellings: Hemicidarina, Hemicidaroida
Full reference: K. Beurlen. 1937. Revision der Seeigel aus dem nord- westdeutschen Jura, II Teil, Die regularen Seeigel. Abhandlungen der Preussischen Geologischen Landesanstalt 174:1-149
Parent taxon: Echinoidea according to R. Berndt 2003
Sister taxa: Acrosalenioida, Archaeocidaridae, Bromidechinus, Cassiduloidea, Cidarites, Cidaroidea, Diplocidaroida, Disasteroida, Dysaster, Echinocrinus, Echinoida, Euechinoidea, Gnathostomata, Oligopygoida, Parechinus, Perischoechinoidea, Radiolus, Regularia, Temnopleuroida
Subtaxa: Allomma, Colpotiara, Micropedina, Trochodiadema
Ecology: slow-moving low-level epifaunal grazer