Margarella expansa

Margarella expansa is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.[2][3][4]

Margarella expansa
Drawing of an apertural view of a shell of Margarella expansa
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Calliostomatidae
Genus: Margarella
Species:
M. expansa
Binomial name
Margarella expansa
Synonyms[2]
  • Margarita expansa G.B. Sowerby I, 1838
  • Margarita (Photinula) expansa Von Martens & G. Pfeffer, 1885
  • Margarites expansa (Sowerby I, 1838)
  • Photina expansa (Sowerby I, 1838)
  • Photinula expansa (G.B. Sowerby I, 1838)
  • Trochus expansa (Sowerby I, 1838)
  • Trochus hillii Forbes, 1850
  • Trochus (Margarita) hillii Forbes, 1850
  • Trochus (Photinula) expansa E. A. Smith

Description

The shell grows to a height of 14.1 mm. The thin, imperforate shell has a depressed-conoidal shape. It is shining, of a light olivaceous tint or somewhat tinged with pink. Its surface is smooth. The acute spire is conoidal. The sutures are slightly impressed. The shell contains about 42 rapidly widening whorls. The large body whorl is rounded at the periphery and a little impressed or margined below the suture. The large aperture is rounded and angular above, green and iridescent inside. The columellar margin is a little straightened. The umbilico-columellar tract is slightly excavated.[5]

Distribution

This marine species occurs off the Falkland Islands and in the Straits of Magellan at depths between 0 m and 150 m.

References
  1. Sowerby, G. B., I. 1838. A descriptive catalogue of the species of Leach's genus Margarita. Malacological and Conchological Magazine 1: 23-27.
  2. Bouchet, P.; Rosenberg, G. (2012). Margarella expansa. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533026 on 2012-12-07
  3. Zelaya D.G. (2004) The genus Margarella Thiele, 1893 (Gastropoda: Trochidae) in the southwestern Atlantic Ocean. The Nautilus 118(3): 112-120.
  4. Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS)
  5. Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia (described as Photinula expansa)
  • Petit R.E. (2009) George Brettingham Sowerby, I, II & III: their conchological publications and molluscan taxa. Zootaxa 2189: 1–218
  • To Antarctic Invertebrates
  • To Barcode of Life
  • To Biodiversity Heritage Library (8 publications)
  • To Encyclopedia of Life
  • To USNM Invertebrate Zoology Mollusca Collection
  • To World Register of Marine Species
  • "Margarella expansa". Gastropods.com. Retrieved 16 January 2019.
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