Amalda optima (Sowerby III, 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: 52-53

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.4333202

persistent identifier

http://treatment.plazi.org/id/03A7D504-FFC9-FFF9-645F-FB24A5D5FD52

treatment provided by

Valdenar

scientific name

Amalda optima
status

 

Amalda optima   (G.B. Sowerby III, 1897)

Fig. 19E View Fig

Ancilla optima Sowerby III, 1897: 7   , pl. 6 fig. 31.

Amalda optima   – Gratecap 2012: 23, 29, fig. 23.

Type material

Possible syntype

SOUTH AFRICA • Durban; NHMUK 1899.4.14.648.

Material examined

One sequenced specimen ( Table 1).

Description

MEASUREMENTS. Shell large (SL up to 55 mm).

SHELL. Broadly ovate, with narrow base and low conical spire. Primary spire callus very thick, smooth and glossy, covering all whorls, except tip of protoconch, rendering measurements impossible. Secondary callus rather thick, with distinct anterior border, smooth and glossy, fusing without visible border with parietal callus, and reaching the shell apex. Plication plate smooth, poorly separated from anterior band, columella smooth. Olivoid groove distinct, labral denticle very short, obtuse. Anterior band smooth, upper anterior band nearly flat, lower anterior band weakly convex. Primary callus milky-caramel with distinct sinuous, narrow brown axial lines, particularly pronounced on last whorl, its narrow spiral brown line bordered abapically by lighter, narrow line. Secondary callus caramel to dark brown, turning very light, nearly white, above aperture. Body whorl cloak background light caramel with irregularly spaced, orthocline, brown axial bands of uneven width, olivoid band much lighter than cloak, creamy-coloured, anterior band very dark brown.

RADULA. Not studied.

Distribution

Natal to Mozambique.

NHMUK

Natural History Museum, London

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

Family

Olividae

Genus

Amalda

Loc

Amalda optima

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

Amalda optima

Gratecap D. 2012: 23
2012
Loc

Ancilla optima

Sowerby III G. B. 1897: 7
1897
Loc

Durban; NHMUK 1899.4.14.648.