Coral Sea morph

Figs 2 (as CS), 5A–F, 7G

Material examined

Sequenced material

15 sequenced specimens (Table 1).

Not sequenced material

CORAL SEA • Material listed by Kilburn & Bouchet (1988) • 1 lv; 19°34′ S, 158°40′ E; 400–413 m deep; EBISCO; stn DW2607; MNHN IM-2007-33278 • 1 lv; 20°51′ S, 161°00′ E; 557–565 m deep; EBISCO; stn CP2643; MNHN IM-2007-33292 • 1 lv; 19°45′ S, 158°40′ E; 386–428 m deep; KANADEEP 1; stn DW4975; MNHN IM-2013-63902 .

Remarks

Shell large (SL up to 66 mm), usually light coloured, rarely nearly white except light yellowish primary callus and anterior band. Very distinct callused carina occupying mid-whorl position appearing on fourth or fifth teleoconch whorl (Fig. 5 A–B, D). Secondary callus indistinct. Young specimens oval (Fig. 5 E–F), large ones fusiform. Upper part of plication plate light yellowish. Upper anterior band strongly convex, in large specimens with obtuse and very broad (about ¾ of anterior band) ridge. At least one specimen (SL 51.3 mm, MNHN IM-2007-33289, Fig. 5C) did not have a callused carina on the spire and had a uniformly white plication plate. Number of columellar ridges variable from 2–3 in small specimens to 6–7 in medium-sized and larger ones. First protoconch whorl diameter 0.75–0.92 mm (mean 0.82, n= 5). The younger specimens of this morph are somewhat similar in colouration to A. aureomarginata and were erroneously identified as such by Kilburn & Bouchet (1988). Depth range 390– 750 m.