quadratum Ivanov & Scheltema, 2008; Spathoderma

Spathoderma quadratum Ivanov & Scheltema, 2008: 33–36; figs. 1I, 21, 22, 23C, D, 24A, tabs. 1, 2; suppl. fig. 9. Type locality. Gulf of Mexico (28°55.16’N, 87°40.22’W), 1825 m.

Type material. Holotype USNM 1112618 (1 spm + 1 slide with sclerites); paratypes 1137268 (1 spm), USNM 1137269 (1 spm), USNM 1137270 (6 spms), USNM 1137271 (1 spm), USNM 1137272 (1 spm), USNM 1137273 (4 spms), USNM 1137275 (1 spm), USNM 1137276 (2 spms + 1 slide with sclerites + 1 slide with radula and jaws), USNM 1484979 (1 spm), USNM 1484980 (1 spm).