Irregular sea urchins/Irreguläre Seeigel

Order/Ordnung	Family/Familie
Cassiduloida	Apatopygidae
	Echinolampadidae
Clypeasteroida	Arachnoididae
	Astriclypeidae
	Clypeasteridae
	Dendrasteridae
	Echinarachniidae
	Fibulariidae
	Laganidae
	Mellitidae
	Rotulidae
Holasteroida	Corystidae
Holectypoida	Echinoneidae
Spatangoida	Asterostomatidae
	Brissidae
	Loveniidae
	Echinocardiidae (Loveniidae)
	Paleopneustidae? Unnamed taxon?
	Pericosmidae
	Schizasteridae
	Spatangidae