Amalda, H. Adams & A. Adams, 1853

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 : 46-47

Amalda sp.

Figs 19 A–B, 20A

Material examined and sequenced PAPUA NEW GUINEA • 1 lv; Manus I; 02°10′ S, 147°16′ E; 200–219 m deep; BIOPAPUA; stn DW3694;

MNHN IM-2013-63891.

Remarks

Radula (n =1, Fig. 20A ) with tricuspid central tooth, with medium broad lateral flaps, central cusp 1.5 times narrower and shorter than lateral ones. Cusps nearly smooth, while lateral flaps are strongly serrated with shallow longitudinal grooves situated between cusplets. 1–2 additional minute cusplets on both sides of central cusp.

In the molecular tree, this seemingly subadult specimen was recovered as sister to Amalda cacao sp. nov. In shell appearance it resembles a miniature A. hilgendorfi , although with thinner and uncarinated spire callus, which is much less microshagreened than in A. hilgendorfi . Judging from the molecular tree, this specimen clearly represents a new species, but we abstain from description pending the collection of additional material including adult specimens.

Figures

Fig. 19. Sequenced species of Amalda H. Adams & A. Adams, 1853. A–B. Amalda sp., MNHN IM- 2013-63891, SL 20 mm. C–D. A. contusa (Reeve, 1864), MNHN IM-2009-22263, SL 24.9 mm. E. A. optima (G.B. Sowerby III, 1897), MNHN IM-2007-38287. F–G. A. monilifera (Reeve, 1864), MNHN IM-2013-63898, SL 11.7 mm. H–I. A. hinomotoensis (Yokoyama, 1922), MNHN IM-2019-618, SL41.4 mm.J–K.A.hayashii Ninomiya, 1988, MNHNIM-2013-44413,SL38.4 mm.L–M.A.bellonarum Kilburn & Bouchet, 1988, MNHN IM-2007-33273. Shells not to scale.

Fig. 20. Radulae of species of Amalda H. Adams & A. Adams, 1853. A. Amalda sp., MNHN IM-2013- 63891 (shell on Fig. 19A–B). B, E. A. monilifera (Reeve, 1864), MNHN IM-2013-63898 (shell on Fig. 19F–G). C–D. A. contusa, MNHN IM-2009-22264, SL 22.7 mm. F–I. A. hayashii Ninomiya, 1988. F–G. MNHN IM-2013-44413 (shell on Fig. 19J–K). H. MNHN IM-2013-44432. I. MNHN IM-2013- 44457, SL 38.2 mm. J–K. A. hinomotoensis (Yokoyama, 1922), MNHN IM-2019-619, SL 38.5 mm.