Amalda hilgendorfi, von Martens, 1897 (von Martens, 1897)

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 : 19

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.

Figures

Fig. 2. Molecular phylogeny of Amalda hilgendorfi (von Martens, 1897) produced by a Bayesian analysis of the Cox1 gene dataset. Outgroups and other species of Amalda have been removed from the tree. Only posterior probabilities ± 90% are shown. The unit for the scale is “substitutions/site”. The geographical distribution and morphological morphs are coded for each specimen: Phil =Philippines; Sol =Solomon Islands; PNG= Papua New Guinea; sNC = South New Caledonia; nNC = North New Caledonia; CS=Coral Sea. Numbers in parentheses at the tips of the tree link the MNHN IM voucher number to the corresponding photo on the right.

Fig. 5. Amalda hilgendorfi (von Martens, 1897). A–F. Coral Sea morph. A-B. MNHN IM-2007- 33313, SL 66 mm. C. MNHN IM-2007-33289, SL 51.3 mm. D. MNHN IM-2007-33288, SL 60.3 mm. E. MNHN IM-2013-63901, SL 27-3 mm. F. MNHN IM-2007-33312, SL 25.9 mm. G–K. Northern New Caledonia morph = A. hilgendorfi richeri Kilburn & Bouchet, 1988. G. Holotype, MNHN IM-2000- 1378, SL 66.9 mm. H. MNHN IM-2009-11916, SL 65 mm. I. MNHN IM-2009-11918, SL 43.2 mm. J. MNHN IM-2007-42675, SL 48.7 mm. K. MNHN IM-2009-11966, SL 29 mm. Shells at the same scale.