Margarella expansa (Sowerby, 1838)

Luca, Javier Di & Zelaya, Diego G., 2019, Gastropods from the Burdwood Bank (southwestern Atlantic): an overview of species diversity, Zootaxa 4544 (1), pp. 41-78 : 47

publication ID	https://doi.org/10.11646/zootaxa.4544.1.2
publication LSID	lsid:zoobank.org:pub:211842AA-6C98-425B-9377-1AF0DC78C893
persistent identifier	https://treatment.plazi.org/id/03DA87AC-FFED-FFB0-FF46-FEB7FDA32A4D
treatment provided by	Plazi (2019-03-30 06:57:42, last updated 2019-03-30 06:57:44)
scientific name	Margarella expansa (Sowerby, 1838)
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Treatment

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.

References

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.

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.

Strebel, H. (1905 a) Beitrage zur Kenntnis der Molluskenfauna der Magalhaen-Provinz 2. Die Trochiden. Zoologische Jahrbucher, 8 (Supplement), 121 - 166, pl. 5.

Zelaya, D. G. (2004) The genus Margarella Thiele, 1893 (Gastropoda: Trochidae) in the southwestern Atlantic Ocean. The Nautilus, 118 (3), 112 - 120.