Clade Atelostomata von Zittel 1879 (sea urchin)
Full reference: K. A. von Zittel. 1879. Handbuch der Palaeontologie 1(1):1-765
Parent taxon: Irregularia according to A. Kroh and A. B. Smith 2010
See also Berndt 2003, Clark and Twitchell 1915, Larrain and Biró-Bagóczky 1985, Squires 1984 and Squires 1987
Sister taxa: Echinoneoida, Holectypoida, Microstomata, Pygasteridae
Subtaxa: Acrolusiidae Asternata Aulacopygus Collyritidae Disasteridae Holasteroida Notidisaster Orbigniana Pycnasterides Spatangoida Sternata Tithoniidae
Ecology: epifaunal grazer-deposit feeder