Aforia magnifica Strebel 1908

Aforia magnifica (Strebel, 1908)

Figures 7 A–D

Surcula magnifica Strebel, 1908: 19, pl. 2, figs. 23 a–d.

Aforia magnifica (Strebel). Powell, 1951: 167, fig. M91; 1958: 201; Dell, 1990: 231, figs. 411–412, 436; Hain, 1990: 69, pl. 7, figs. 8 a–c, pl. 26, figs. 1–2; Numanami et al., 1996: 211, 213, pl. 3, figs. 1, 4; Aldea and Troncoso, 2010: 139, fig. 139; Engl, 2012: 179, Pl. 73, fig. 2.

Type material. Lectotype, SMNH 1328, illustrated by Engl (2012, Pl. 73, fig. 2).

Type locality. Graham Region, 64º03’S – 53º67’W, in 360 m depth.

Material examined. CNP-Inv. 1835, 1854 both from St. 2 CAV2014, 61º6.952’S, 56º12.69’W, in 563–648 m depth, 2 specimens; CNP-Inv 620, St. 12 CAV2011, 61º46’S, 58º26’W in 200 m, 1 specimen; CNP-Inv. 1960, St. 14 CAV2014, 63º53.880’S, 61º52.823’W in 151 m depth, 1 specimen; CNP-Inv. 1952, St. 15 CAV2014, 63º54.151’S, 62º7.686’W in 270 m depth; CNP-Inv. 1946, St. 17 CAV2014, 64º1.564’S, 62º58.518’W, in 405–440 m depth, 1 specimen; CNP-Inv. 616, St. 19 CAV2011, 62°52´S, 60°36´W in 559 m; CNP-Inv. 1822, 1812, all from St. 19 CAV 2014, 64°6.488’S, 63°58.034’W in 559 m depth; CNP-Inv. 615, St. 20 CAV2011, 62º47’S, 60º12’W in 200 m depth, 2 specimens; CNP-Inv. 1958, St. 21 CAV2014, 64º44.693’S, 63º4.266’W in 326–370 m, 1 specimen; CNP-Inv. 614, 617, 618, 619, 2018, 2019 all from St. 22 CAV2011, 62º43’S, 56º32’W in 200 m depth, 15 specimens. All the station are from several cruises to Antarctic Peninsula area on board of the RV “Puerto Deseado” during 2011 and 2014 field work; MACN-In 35052, 1 sp., Isla Baja, Antarctica; MACN-In 35049, 1 sp., 25 de mayo Is., South Shetland Is.; MLP 7470, 1 sp., South Orkneys.

Distribution. Circum-Antarctic (according to Aldea & Troncoso, 2010).

Remarks. The shell of this species is characterized by a single rounded carina along the whole shell and a second carina on the last whorl. The anal sinus has the angulation above the keel. The operculum is large, quadrangular, with terminal nucleus. Rachidian with a single large cusp and a subrectangular base. Marginal teeth duplex with major element together to a robust accessory limb, base attached to radular membrane and major element.