This is a fascinating genus because of its perignathic girdle and ambulacral compounding. The adradial 'auricles' resemble those of euechinoids, but these structures are constructed largely from the interambulacral plates and have minimal ambulacral involvement (in euechinoids the same structures are predominantly ambulacral in origin, with only a small input from interambulacral zones). Hagdorn (1995) gives a detailed description of this taxon.
Hagdorn, H. 1995. Die Seeigel des germanischen oberen Muschelkalks. Geologische und Palaontologische Mitteilungen, Innsbruck 20, 245-281.