Amalda optima (Sowerby III, 1897)
publication ID |
https://doi.org/ 10.5852/ejt.2020.706 |
publication LSID |
lsid:zoobank.org:pub:C4C4D130-1EA7-48AA-A664-391DBC59C484 |
DOI |
https://doi.org/10.5281/zenodo.4333202 |
persistent identifier |
https://treatment.plazi.org/id/03A7D504-FFC9-FFF9-645F-FB24A5D5FD52 |
treatment provided by |
Valdenar |
scientific name |
Amalda optima |
status |
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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 |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Genus |
Amalda optima
Kantor, Yuri I., Castelin, Magalie, Fedosov, Alexander & Bouchet, Philippe 2020 |
Amalda optima
Gratecap D. 2012: 23 |
Ancilla optima
Sowerby III G. B. 1897: 7 |
Durban; NHMUK 1899.4.14.648. |