Invalid names: Deltocyathus staszici Rozkowska 1955 [synonym], Paratrochocyathus epicharis Wanner 1902 [synonym], Paratrochocyathus lemniscatus Squires 1958 [synonym], Protrochocyathus deniseptatus Hassan and Salama 1970 [synonym], Tethocyathus kopetdagensis Kuzmicheva 1987 [synonym], Trochocyathus johannesi Floris 1972 [synonym], Trochocyathus kroisbachensis Traub 1938 [synonym], Trochocyathus mississippiensis Wells 1933 [synonym]