Leptochiton medinae Plate, 1899

(Figs 5–7)

Leptochiton medinae Plate 1899: 82 –89; pl.5, figs. 204–206; Kaas & Van Belle 1985: 80 –83; Sirenko 2006: 82; Schwabe & Sellanes 2010: 34 –36, Figs 1 K, 5E, F, 6, 7A, B

Type. Lectotype (ZMB /Moll-102.045), designated by Schwabe & Sellanes (2010) (not examined).

Type locality. Chile, Magellan Strait, off Punta Arenas, 53º09’S 70º55’W, 15– 18 m.

Material examined. Magellan Strait and Beagle Channel. RV Victor Hensen, st. 881, AGT, 53°42.0’S, 70°57.4’W, 56 m, 1 spm, 26.10.1994, leg. K. Linse; st.884, EBS, 53°42.6’S, 70°57.5’W, 51 m, 6 spms, 26.10.1994, leg. K. Linse; st. 949, AGT, 53°10.5’S, 70°53.5’W, 24 m, 1 spm, 30.10.1994, leg. K. Linse; st. 972, EBS, 53°28.8’S, 70°21.9’W, 92 m, 10 spms, 0 1.11.1994, leg. K. Linse; st. 980, EBS, 53°42.7’S, 70°50.1’W, 552 m, 1 spm, 0 1.11.1994, leg. K. Linse; st. 1040, EBS, 54°51.0’S, 69°55.7’W, 30 m, 6 spms, 0 4.11.1994, leg. K. Linse; st. 1247, 54°59.43’S, 69°04.64’W, 100 m, 5 spms, 19.11.1994, leg. A. Brandt; st. 1316, AGT, 54°054’S, 70°58.3’W, 360 m, 1 spm, 24.11.1994, leg. K. Linse; Isla de los Estados. RV Eltanin, cruise 5, st. 453, 54°27’– 54°24’S, 66°12’– 66°17’W, 3 spms, 21.01.1963; RV Hero, cruise 712, st. 668, 54°46.25’S, 64°02.85’W, 23 m, 3 spms, 15.05.1971; Atlantic ocean, Argentina. RV Hero, st. G, 42°54.0’S, 64°23’W, 20–50 m, 16 spms, 18.07.1978.

Distribution. On both sides of southern South America from Lat.42° south to Cape Horn (Kaas & Van Belle, 1985; Schwabe & Sellanes, 2010), at depth 8– 552 m.

Remarks. Schwabe & Sellanes (2010) erroneously reported an unicuspidate head of the second (major) lateral tooth of the radula in L. medinae . Kaas & Van Belle (1985) and the present data (Fig.7) show a bicuspidate head of the major lateral tooth of the radula in L. medinae . The specimen figured in Schwabe & Sellanes (2010, Fig.5, E, F) apparently shows the anterior-most part of the radula with worn denticles of the relevant teeth. I observed that the anterior most parts of the radula in several species including L. medinae, L. sykesi, L. laurae and others have unicuspidate head of the major lateral tooth because of the head was erased during process of feeding.