- Girardema depressum (Agassiz in Agassiz & Desor, 1846) † accepted as Trochotiara depressum (Agassiz in Agassiz & Desor, 1846) †
- Polydiadema ambiguum Hess, 1972 †
- Polydiadema bosei Chiplonkar & Badve, 1972 †
- Polydiadema joaquinensis Alex Clark in Grant & Hertlein, 1938 †
- Polydiadema karakachi Weber, 1934 †
- Polydiadema korotkovi Poretskaya, 1983 †
- Polydiadema mamillanum (Roemer, 1836) †
- Polydiadema mamillanus (Roemer, 1836) † accepted as Polydiadema mamillanum (Roemer, 1836) †
- Polydiadema travisensis Smith & Rader, 2009 †