Amalda montrouzieri (Souverbie, 1860)

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: 33-34

publication ID

https://doi.org/10.5852/ejt.2020.706

publication LSID

lsid:zoobank.org:pub:C4C4D130-1EA7-48AA-A664-391DBC59C484

DOI

http://doi.org/10.5281/zenodo.4333198

persistent identifier

http://treatment.plazi.org/id/03A7D504-FFDA-FFEC-6451-F924A7F2F823

treatment provided by

Valdenar

scientific name

Amalda montrouzieri (Souverbie, 1860)
status

 

Amalda montrouzieri (Souverbie, 1860)  

Figs 12 View Fig , 13 View Fig A–C, 14A–B, 17C–D

Ancillaria montrouzieri Souverbie, 1860a: 207   .

Ancillaria montrouzieri   – Souverbie 1860b: 324, pl. 11 fig. 3. — Reeve 1864: pl. 4 fig. 9.

Amalda montrouzieri   – Kilburn & Bouchet 1988: 278–281, figs 1–8, 38–39, 51, 53. — Gratecap 2014: 13, 18, figs 1–4.

Type material

Syntypes

NEW CALEDONIA • 1 shell; “Insul. Lifu? (Loyalty). Insul. Art?” [ Souverbie 1860a]; Île des Pins [ Souverbie 1860b]; MNHN IM-2000-1367   3 shells; same collection data as for preceding; MNHN IM- 2000-1475 ( Fig. 12 View Fig A–C).  

Material examined

Sequenced material

SOUTHERN NEW CALEDONIA • 1 lv; Baie du Prony; 12–18 m deep; MNHN IM-2013-80199   .

Not sequenced material

Material mentioned in Kilburn & Bouchet (1988), about 50 lots, 110 specimens.

Description

MEASUREMENTS. Shell medium in size (SL up to 41.5 mm, usually less than 30 mm).

SHELL. Ovate-fusiform, with a cyrtoconoid spire. Primary spire callus thick, weakly microshagreened, covering all whorls, including most of protoconch rendering measurements inaccurate, and with weak spiral lirae (8–10 on penultimate whorl). Secondary callus medium thick, forming extensive pad on right side of spire. Plication plate with 2–4 (usually 3) ridges. Olivoid groove from shallow to rather deep, labral denticle weak, obtuse. Upper anterior band very weakly convex, nearly flat. Lower anterior band flat, smooth. Colour from uniformly white, to chestnut brown. In darker coloured specimens, primary spire callus and upper anterior band darker, olivoid band lighter than body whorl cloak, plication plate white.

RADULA (n =2, not sequenced) ( Fig. 13 View Fig A–C). Very similar in these two. Central tooth tricuspid, with central cusp ¼ smaller than lateral ones. All cusps, as well as lateral flaps of central tooth, with irregular distinct serration.

LIVE SPECIMENS ( Fig. 14 View Fig A–B). With truncated and notched posteriorly foot. Parapodia opaque, greyish, with scarce slightly darker speckles, can completely envelop shell. Propodium, anterior part of parapodia and siphon with more dense speckles.

Remarks

The species is quite variable in shell shape and particularly in colouration, with many specimens pure white or with lightly coloured secondary callus (e.g., Fig. 12F, I View Fig ). The syntypes are the largest examined specimens. Kilburn & Bouchet (1988: 281) mentioned the existence of “a puzzling morph which is uniformly different in shape (although there are indications of intergradation in this regard) and in its faint ancillid (=olivoid) groove” at larger depths (175–420 m) ( Fig. 12 View Fig J–K). This morph differs from A. montrouzieri   and A.alabaster   sp. nov. in its narrower shell with taller spire. It may represent a peculiar morph of A. alabaster   sp. nov. or a separate species.

Distribution

Southern New Caledonia. Amalda montrouzieri   is normally distributed at depths of 10–70 m, with specimens occasionally collected down to 130 m; a few empty shells were collected at even larger depths, down to 280 m (SMIB 3, stn DW20). Kilburn & Bouchet (1988) cited some extralimital records, mostly on the basis of published records, namely the Loyalty Islands, Fiji, the Ryukyu Islands, and the Philippines. These records should be confirmed with molecular data.

MNHN

France, Paris, Museum National d'Histoire Naturelle

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

Family

Olividae

Genus

Amalda

Loc

Amalda montrouzieri (Souverbie, 1860)

Kantor, Yuri I., Castelin, Magalie, Fedosov, Alexander & Bouchet, Philippe 2020
2020
Loc

Amalda montrouzieri

Gratecap D. 2014: 13
Kilburn R. N. & Bouchet P. 1988: 278
1988
Loc

Ancillaria montrouzieri

Souverbie S. M. 1860: 207
1860
Loc

Ancillaria montrouzieri

Souverbie S. M. 1860: 324
1860