Thaumastus species. A–CT. (Thaumastiella) sarcochrous (Pilsbry, 1897), holotype ANSP 4705 (H = 29.0) D–GT. (Thaumastiella) glyptocephalus (Pilsbry, 1897), syntype ANSP 25675 (H = 31.0) G detail of protoconch sculpture HT. (Thaumastiella) koepckei Zilch, 1953, holotype SMF 111487(H = 46.6) IT. (Thaumastiella) occidentalis occidentalis Weyrauch, 1960, holotype SMF 162026 (H = 45.7) JT. (Thaumastiella) occidentalis debilisculptus Weyrauch, 1960, holotype SMF 162029 (H = 40.0).