Published December 13, 2018 | Version v1
Taxonomic treatment Open

Nacella SCHUMACHER 1817

Description

GENUS NACELLA SCHUMACHER, 1817

Nacella Schumacher, 1817: 179. Type species (by monotypy) Nacella mytiloides Schumacher, 1817 (= Patella mytilina Helbling, 1779).

Patinigera Dall, 1905: 53. Type species (by original designation) Patella magellanica Gmelin, 1791. New Synonymy.

Revised diagnosis: The shell is of medium to moderately large size and the thickness varies from hard and robust in some species (N. magellanica, N. deaurata, N. delesserti, N. terroris, N. concinna and N. clypeater) to thin and fragile in others (N. kerguelenensis, N. flammea, N. edgari, N. yaghana sp. nov. and N. mytilina). The shell morphology is typically elliptical, high-arched, with the apex strongly curved forward and downward, sometimes almost at the anterior end. The surface of the shell varies from very smooth (e.g. N. mytilina) to strongly radially ridged (e.g. N. magellanica). The external shell colour is pale-olive to brownish, the apex coppery; the inside is silvery iridescent to reddish bronze.

Remarks: Based on shell morphology, the genus Nacella has traditionally been divided into Nacella s. str. and the subgenus Patinigera (Powell, 1973). Members of Nacella s. str. are characterized by a thin and fragile shell, they inhabit seaweeds and are restricted to southern South America (N. mytilina) and the Kerguelen Islands (N. kerguelenensis), whereas the remaining species were included in Patinigera and exhibit solid shells, are typical inter- and subtidal rocky dwellers, grazers and are broadly distributed in the Southern Ocean. Nevertheless, the distinction between Nacella and Patinigera was not corroborated by molecular analyses; indeed, the respective type species are very closely related (González-Wevar et al., 2010, 2011a, 2017; this study).

NACELLA YAGHANA GONZÁLEZ- WEVAR & NAKANO

Notes

Published as part of González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish & Poulin, Elie, 2019, Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America, pp. 303-336 in Zoological Journal of the Linnean Society 186 on page 307, DOI: 10.1093/zoolinnean/zly067, http://zenodo.org/record/5718878

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Additional details

References

  • Schumacher HFC. 1817. Essai d'un nouveau systeme des habitations des Vers Testaces. De l'Imprimerie de M le directeur Schultz a Copenhagen.
  • Helbling GS. 1779. Beitrage zur Kenntnis neuer und seltener Konchylien. Abhandlungen der Koniglich bohmischen Geselschaft der Wissenschaften 4: 102 - 131.
  • Dall WH. 1905. Notes on some preoccupied names of mollusks. Nautilus 18: 1 - 113.
  • Gmelin JF. 1791. Vermes. In: Gmelin JF, ed. Systema Naturae per Regna Tria Naturae, ed. 13. Leipzig, Germany: Tome 1. G. E. Beer, 3021 - 3910.
  • Powell AWB. 1973. The patellid limpets of the World (Patellidae). In: Abbot RT ed. Indo-Pacific Mollusca: monographs of the marine mollusks of the world with emphasis on those of the tropical western Pacific and Indian Oceans, Vol. 3. Auckland, New Zealand: Auckland Institute and Museum.
  • Gonzalez-Wevar CA, Nakano T, Canete JI, Poulin E. 2010. Molecular phylogeny and historical biogeography of Nacella (Patellogastropoda: Nacellidae) in the Southern Ocean. Molecular Phylogenetics and Evolution 56: 115 - 124.
  • Gonzalez-Wevar CA, Nakano T, Canete JI, Poulin E. 2011 a. Concerted genetic, morphological and ecological diversification in Nacella limpets in the Magellanic Province. Molecular Ecology 20: 1936 - 1951.
  • Gonzalez-Wevar CA, Hune M, Segovia NI, Nakano T, Spencer HG, Chown S, Saucede T, Johnstone G, Mansilla A, Poulin E. 2017. Following the Antarctic Circumpolar Current: patterns and processes in the biogeography of the limpet Nacella (Mollusca: Patellogastropoda) across the Southern Ocean. Journal of Biogeography 44: 861 - 874.