Amalda coriolis Kilburn & Bouchet, 1988

Kantor, Yuri I., Castelin, Magalie, Fedosov, Alexander & Bouchet, Philippe, 2020, The Indo-Pacific Amalda (Neogastropoda, Olivoidea, Ancillariidae) revisited with molecular data, with special emphasis on New Caledonia, European Journal of Taxonomy 706, pp. 1-59 : 44-46

Amalda coriolis Kilburn & Bouchet, 1988

Figs 13H , 18 F–J

Amalda coriolis Kilburn & Bouchet, 1988: 293 , figs 33–37, 42–43, 58.

Amalda coriolis – Gratecap 2014: 14, 19, figs 14–15.

Type material

Holotype

CORAL SEA • Lord Howe Ridge , Kelso Bank ; 24°10′ S, 159°36′ E; 270 m deep; MUSORSTOM 5; stn DW280; MNHN IM-2000-1393 .

Material examined

Sequenced material

Two sequenced specimens ( Table 1).

Not sequenced material

CORAL SEA • Material listed by Kilburn & Bouchet (1988) • 1 dd; Capel Bank ; 25°08′ S, 159°50′ E; 270 m deep; KANADEEP 1; stn CP4928 • 9 dd; Capel Bank; 25°21′ S, 159°45′ E; 235–242 m deep; stn DW4944 • 2 dd; Kelso Bank; 24°08′ S, 159°37′ E; 275–276 m deep; stn CP4947 • 1 dd; Kelso Bank; 24°07′ S, 159°40′ E; 275 m deep; stn CP4948 • 1 dd subadult; Kelso Bank; 24°12′ S, 159°41′ E; 270–385 m deep; stn DW4951.

Description

MEASUREMENTS. Shell large (SL up to 48.9 mm).

SHELL. Biconic-ovate, with narrow base and high, acutely conical spire. Last whorl angulated just below suture. Primary spire callus thick, microshagreened, covering all whorls, except 1–1.5 protoconch whorls, with very weak spiral ridges. Protoconch large, low-dome shaped, first whorl diameter 0.95– 1.13 mm (mean 1.06, n=5). Secondary callus very thick, fusing without visible border with parietal callus, with distinct anterior border, forming a strong pad reaching adapical suture of antepenultimate whorl. Plication plate with 1–4 ridges, all weak except adapical one, columella smooth. Olivoid groove distinct, labral denticle not pronounced. Upper anterior band weakly convex, with rounded and weak submedian low ridge. Lower anterior band nearly flat, microshagreened. Primary callus from very light yellowish to dark orange-brown in upper part, in the lower part with white to creamy spiral band. Secondary callus white to creamy. Body whorl cloak from white to orange, olivoid band nearly white, upper anterior band from yellowish to dark brown and lower anterior band from white to orange-brown, plication plate white.

RADULA ( Fig. 13H ). Examined in one specimen. Central tooth tricuspid, with broad lateral flaps, central cusp slightly narrower and shorter than lateral ones. Central cusp nearly smooth, lateral ones slightly serrated, broad lateral flaps strongly serrated with indistinct longitudinal grooves situated between cusplets.

Remarks

The radula illustrated by Kilburn & Bouchet (1988: fig. 58) is very similar to our specimen.

This very characteristic species is readily distinguished from all other species in New Caledonia by its shell shape. Although the holotype is dark coloured, most specimens are much lighter, sometimes even pure white ( Fig. 18J ). The upper anterior band is the last shell zone that loses colour.

Distribution

The species is a narrow endemic found only on Kelso and Capel banks in the Coral Sea at depths of 150– 275 m.

Figures

Fig. 13. Radulae of species of Amalda H. Adams & A. Adams, 1853. A–C. A. montrouzieri (Souverbie, 1860). A–B. Île Ouen – Baie du Prony, LAGON, stn DW239, 22°24.3′ S, 166°57.8′ E, 42–43 m, SL 20.2 mm. C. Grand Récif Sud, LAGON, stn DW544, 22°50.8′ S, 166°48.5′ E, 25 m, SL 25.4 mm (shell on Fig. 12I). D–E. A. alabaster sp. nov. D. Holotype, MNHN IM-2007-43627, SL 26.7 mm (shell on Fig. 15A–B). E. MNHN IM-2007-43636, SL 17.6 mm. F. A. cf. alabaster, MNHN IM-2013-63897, SL 18.1 mm (shell on Fig. 15H–I). G. A. allaryi Bozzetti, 2007, MNHN IM-2013- 68272 (shell on Fig. 17A). H. A. coriolis Kilburn & Bouchet, 1988, MNHN IM-2013-63899 (shell on Fig. 18H–I).

Fig. 18. A–E. A. fuscolingua Kilburn & Bouchet, 1988. A–B. Holotype, MNHN IM-2000-1439, SL 30.6 mm. C. MNHN IM-2007-43643, SL 26.6 mm (sequenced specimen). D–E. MNHN IM-2007- 43649, SL 30.2 mm (sequenced specimen). F–J. A. coriolis Kilburn & Bouchet, 1988. F–G. Holotype, MNHN IM-2000-1393, SL 40.1 mm. H–I. MNHN IM-2013-63899, SL 40.4 mm (sequenced specimen). J. Coral Sea, Capel Bank, KANADEEP, stn DW4944, 25°21′ S, 159°45′ E, 235–242 m, SL 37.3 mm. A–E= at the same scale; F–J =at the same scale.