Published January 10, 2019 | Version v1
Taxonomic treatment Open

Margarella expansa

Description

Margarella expansa (Sowerby, 1838)

Fig. 2F

Margarita expansa Sowerby, 1838a: 24; Sowerby, 1838b: pl. 134, figs. 16, 17

Photinula expansa — Melvill & Standen, 1907: 126; Melvill & Standen, 1912: 121

Margarella expansa — Zelaya, 2004: figs. 2, 4, 7, 16–18, 21, 22 (protoconch and radula)

Examined material. 3 an. and 9 sh. (MACN-In 40666).

Description. Shell width to 8.5 mm (up to 14.1 mm according to Strebel 1905a); trochiform, solid. Protoconch of about 1 convex whorl; transition to teleoconch poorly defined. Teleoconch of up to 4.5 whorls, slightly convex in outline; the latter widely laterally expanded, comprising about 85% of total shell height. Suture impressed. Surface white, shiny, iridescent green; only sculptured with faint growth lines. Aperture rounded, interior iridescent; columellar callus thick, expanded, forming a depression over the umbilical area. Operculum rounded, multispiral; pale brown, translucent.

Notes

Published as part of Luca, Javier Di & Zelaya, Diego G., 2019, Gastropods from the Burdwood Bank (southwestern Atlantic): an overview of species diversity, pp. 41-78 in Zootaxa 4544 (1) on page 47, DOI: 10.11646/zootaxa.4544.1.2, http://zenodo.org/record/2618137

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Linked records

Additional details

Biodiversity

Family
Calliostomatidae
Genus
Margarella
Kingdom
Animalia
Order
Vetigastropoda
Phylum
Mollusca
Scientific name authorship
Sowerby
Species
expansa
Taxon rank
species
Taxonomic concept label
Margarella expansa (Sowerby, 1838) sec. Luca & Zelaya, 2019

References

  • Sowerby, G. B. I. (1838 a) A descriptive catalogue of the species of Leach's genus Margarita. Malacological and Conchological Magazine, 1, 23 - 27.
  • Sowerby, G. B. I. (1838 b) Margarita. Conchological Illustrations, 1, pls. 132 - 134.
  • Melvill, J. C. & Standen, R. (1907) The marine Mollusca of the Scottish National Antarctic Expedition. Transactions of the Royal Society of Edinburgh, 46, 119 - 157, 1 pl.
  • Melvill, J. C. & Standen, R. (1912) The marine Mollusca of the Scottish National Antarctic Expedition. Part 2. Transactions of the Royal Society of Edinburgh, 48, 105 - 140, 1 pl.
  • Zelaya, D. G. (2004) The genus Margarella Thiele, 1893 (Gastropoda: Trochidae) in the southwestern Atlantic Ocean. The Nautilus, 118 (3), 112 - 120.
  • Strebel, H. (1905 a) Beitrage zur Kenntnis der Molluskenfauna der Magalhaen-Provinz 2. Die Trochiden. Zoologische Jahrbucher, 8 (Supplement), 121 - 166, pl. 5.