Nacella is a southern, cold-water genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of true limpet

Limpet

Limpet is a common name for a number of different kinds of saltwater and freshwater snails ; it is applied to those snails that have a simple shell which is more or less conical in shape, and either is not spirally coiled, or appears not to be coiled in the adult snails.The name limpet is most...

s, marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 gastropod molluscs in the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Patellidae

Patellidae

Patellidae is a taxonomic family of sea snails or true limpets, marine gastropod molluscs in the clade Patellogastropoda.Patellidae is the only family in the superfamily Patelloidea...

, the true limpet

Limpet

Limpet is a common name for a number of different kinds of saltwater and freshwater snails ; it is applied to those snails that have a simple shell which is more or less conical in shape, and either is not spirally coiled, or appears not to be coiled in the adult snails.The name limpet is most...

s.

These limpets are found in the littoral zone and sublittoral zone of Antarctic

Antarctic

The Antarctic is the region around the Earth's South Pole, opposite the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica and the ice shelves, waters and island territories in the Southern Ocean situated south of the Antarctic Convergence...

 and sub-Antarctic waters including (Tierra del Fuego

Tierra del Fuego

Tierra del Fuego is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of a main island Isla Grande de Tierra del Fuego divided between Chile and Argentina with an area of , and a group of smaller islands including Cape...

, Macquarie Island

Macquarie Island

Macquarie Island lies in the southwest corner of the Pacific Ocean, about half-way between New Zealand and Antarctica, at 54°30S, 158°57E. Politically, it has formed part of the Australian state of Tasmania since 1900 and became a Tasmanian State Reserve in 1978. In 1997 it became a world heritage...

, Kerguelen Island, and Heard and McDonald Islands). The grayish-brown shell is suboval and flattened and the ribbing on the shell is rather flat. The shiny interior of the shell is rust-colored or chocolate-brown.

Species

Species within the genus Nacella include:

• Nacella concinna
  Nacella concinna
  Nacella concinna is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets....
  
  (Strebel, 1908)
• Nacelaa deaurata Gmelin, 1791 - Patagonian copper limpet
• Nacella clypeater R. P. Lesson, 1831 - Chilean copper limpet
• Nacella concinna
  Nacella concinna
  Nacella concinna is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets....
  
  H. Strebel, 1908 - Antarctic limpert, South Polar limpet
• Nacella deaurata
  Nacella deaurata
  Nacella deaurata is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets....
  
  J. F. Gmelin, 1791
• Nacella delesserti Hodgson and Bernard, 1989
• Nacella delicatissima Strebel, 1907
• Nacella flammea Gmelin, 1791
• Nacella fuegiensis L. A. Reeve, 1855 - Tierra del Fuego limpet
• Nacella kerguelenensis
  Nacella kerguelenensis
  Nacella kerguelenensis is a southern, cold-water species of limpet, a marine gastropod mollusc in the family Nacellidae, the true limpets.-Distribution:...
  
  (E. A. Smith, 1877)
• Nacella macquariensis
  Nacella macquariensis
  Nacella macquariensis is a southern, cold-water species of sea snail, a limpet, a marine gastropod mollusc in the family Nacellidae, the true limpets.-Distribution:...
  
  Finlay
  Harold John Finlay
  Harold John Finlay was a New Zealand palaeontologist and conchologist. He was born in Comilla, India , on 22 March 1901....
  
  , 1927
• Nacella magellanica
  Nacella magellanica
  Nacella magellanica is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets.-Distribution:...
  
  J. F. Gmelin, 1791 - Magellanic copper limpet
• Nacella mytilina
  Nacella mytilina
  Nacella mytilina is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Nacellidae, one of the families of true limpets....
  
  Helbling, 1779
• Nacella terroris
  Nacella terroris
  Nacella terroris is a southern, cold-water species of sea snail, a limpet, a marine gastropod mollusc in the family Nacellidae, the true limpets....
  
  (Filhol
  Henri Filhol
  Henri Filhol was a French medical doctor, malacologist and naturalist. He served as the expedition doctor and naturalist on the French 1874 Transit of Venus expedition to Campbell Island, New Zealand, with a peak on the island, Filhol Peak, being named after him...
  
  ,1880)

Species brought into synonymy :

• Nacella peltoides Carpenter, 1864 : synonym of Williamia peltoides (Carpenter, 1864)
• Nacella subspiralis Carpenter, 1864 : synonym of Williamia subspiralis (Carpenter, 1864)