Amalda fuscolingua Kilburn & Bouchet 1988

Amalda fuscolingua Kilburn & Bouchet, 1988

Fig. 9B, 18 A–E

Amalda fuscolingua Kilburn & Bouchet, 1988: 288–289, figs 25–28, 40–41, 54.

Amalda fuscolingua – Gratecap 2014: 14, 18, figs 11–13.

Holotype

SOUTHERN NEW CALEDONIA • S of Île des Pins; 22°54′ S, 167°14′ E; 412–428 m deep; SMIB 2; stn DW03; MNHN IM-2000-1439.

Sequenced material

8 sequenced specimens (Table 1).

Not sequenced material

SOUTHERN NEW CALEDONIA • material listed by Kilburn & Bouchet (1988) • 1 dd; SW of Île des Pins; 22°56′ S, 167°15′ E; 437 m deep; SMIB 3; stn DW25 • 1 dd; SW of Île des Pins; 22°46′ S, 167°11′ E; 394 m deep; SMIB 3; stn DW28 • 4 dd; SW of Île des Pins; 22°47′ S, 167°12′ E; 405 m deep; SMIB 3; stn DW29 • 1 lv; 3 dd; between Île des Pins and Grand Récif Sud; 22°56′ S, 167°14′ E; 400– 420 m deep; SMIB 4; stn DW65 • 1 dd; between Île des Pins and Grand Récif Sud; 22°56′ S, 167°15′ E; 400–430 m deep; SMIB 4; stn DW66 • 1 dd; between Île des Pins and Grand Récif Sud; 22°55′ S, 167°15′ E; 395–405 m deep; SMIB 4; stn DW69 • 15 lv, dd; E of Île des Pins; 22°51′ S– 22°52′ S, 168°12’ E– 168°13′ E; 408–436 m deep; SMIB 8; stn DW197-199 • 15 lv, dd; SE slope of Passe de Dumbéa; 22°52′ S, 167°12′ E; 400 m deep; BATHUS 2; stn DW729 • 15 dd; S of Île des Pins; 22°44′ S, 167°17′ E; 350–393 m deep; BATHUS 2; stn DW717 • 3 dd; S of Île des Pins; 22°50′ S, 167°27′ E; 430–433 m deep; BATHUS 2; stn DW723 • 10 dd; S of Île des Pins; 22°48′ S, 167°26′ E; 344–358 m deep; BATHUS 2; stn DW724 • 6 dd; Canal de la Havannah; 22°13′ S, 167°09′ E; 353–365 m deep; EXBODI; stn DW3784 • 1 dd; Canal de la Havannah; 22°15′ S, 167°10′ E; 386–387 m deep; EXBODI; stn DW3785 • 7 dd; SW of Île des Pins; 22°57′ S, 167°16′ E; 427–433 m deep; NORFOLK 1; DW1733 • 15 lv, dd; SW of Île des Pins; 22°52′ S, 167°12′ E; 383–407 m deep; NORFOLK 1; stn DW1736 • ca 30 lv, dd; SW of Île des Pins; 22°51′ S, 167°10′ E; 400 m deep; NORFOLK 1; stn DW1737; • 15 dd; SW of Île des Pins; 22°51′ S, 167°12′ E; 340–381 m deep; NORFOLK 1; stn DW1738. – Off Île des Pins • 10 dd; 22°44′ S, 167°16′ E; 386–391 m deep; NORFOLK 2; stn DW2148 • 12 dd; 22°43′ S, 167°14′ E; 353–368 m deep; NORFOLK 2; stn DW2151 • 4 dd; 22°47′ S, 167°12′ E; 395–400 m deep; NORFOLK 2; stn CP2153 • 25 dd; 22°54′ S, 167°15′ E; 468–500 m deep; NORFOLK 2; stn DW2156 • 1 lv; 22°45′ S, 167°13′ E; 400–405 m deep; KANACONO; stn DW4660; MNHN IM-2013-68426 • 2 lv; 22°57′ S, 167°39′ E; 310–403 m deep; KANACONO; stn DW4745; MNHN IM-2013-63419; MNHN IM-2013-63425.

MEASUREMENTS. Shell large (SL up to 57 mm).

SHELL. Ovate-fusiform, with blunt orthoconoid spire. Primary spire callus thick, microshagreened, covering all whorls, except 1–1.5 protoconch whorls. First protoconch whorl diameter 0.92–1.06 mm (mean 0.98, n=5). Secondary callus thick, fusing without visible border with parietal callus, with distinct anterior border, reaching suture of antepenultimate whorl. Plication plate with 3–6 ridges, all weak except outer 2, columella smooth. Olivoid groove very shallow to obsolete, labral denticle very small, obtuse to absent. Upper anterior band nearly flat except weak submedian low ridge. Lower anterior band nearly flat, microshagreened. Primary callus orange-brown in lower part, brown on spire with distinct, strongly prosocline, lighter axial lines. Secondary callus orange-brown. Body whorl cloak light yellowish-brown, olivoid band usually slightly lighter, anterior band orange brown with upper anterior band slightly darker, of the same colour as cloak, plication plate white.

This distinct species poses no taxonomic problems due to its very characteristic colour pattern of primary spire callus with strongly prosocline lighter axial lines and brightly coloured thick orangebrown secondary callus. There is no species in New Caledonia resembling A. fuscolingua.

The radula, examined by Kilburn & Bouchet (1988: fig. 54), is similar to that of A. montrouzieri with central tooth with less serrated cusps.

Distribution The species is confined to a narrow perimeter around Île des Pins (Fig. 9B), with a maximal extension

of 150× 60 km and a depth range of 300– 500 m.