Thaumastus species. A–CT. (Thaumastus) foveolatus (Reeve, 1849), lectotype NHMUK 1975275 (H = 71.5) D–ET. (Thaumastus) insolitus (Preston, 1909), holotype NHMUK 1947.3.11.1 (H = 70.4) FT. (Thaumastus) granocinctus Pilsbry, 1901, syntype SMF 208383 (H = 80.5).