sentences:  Shells may be discoidal or globular or in between.The Adriantinae which are found widespread in lower and middle Permian marine sediments are derived from "Crimites", a genus in the more primitive Emilitinae subfamily, through "Neocrimites" which gave rise to "Adrianites", "Epadrianites", "Pseudagathiceras", and "Sosiocrimites" (Saunders et al.1999).