Nacella SCHUMACHER 1817
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 s...
| Main Authors: | , , , , , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2018
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| Online Access: | https://doi.org/10.5281/zenodo.5718880 http://treatment.plazi.org/id/C55987A1811DFFD7338DFD420EC6FF08 |
| Summary: | 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 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: ... |
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