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"Nacella mytilina (Helbling, 1779)
(Pl. 73, fig. 9; Pls. 173, 174)



Range-Southern Chile, Straits of Magellan, Tierra del Fuego, Falkland Islands and Kerguelen Island.


Description-Shell rather small, up to 43 mm. (1⅝ inches) in length, elliptical, thin and fragile, with the apex almost at the anterior end. Usually the surface is almost smooth, but occasionally moderate radial ridges are developed, as well as corrugations around the anterior margin. Colour greenish olive to light brownish, sometimes red­dish bronze at the apex, and the interior is silvery iridescent.


Measurements (mm.)-(all A.W.B. Powell col­lection).















Punta Arenas








Falkland Islands








Hermit Id., Cape Horn






1779 Patella mytilina Helbling, Abh. Privatges. Bohm., vol. 4, p. 104, pl. 1, figs. 5, 6.


1786 Patella mytiliformis Lightfoot, Cat. Portland Mus., p. 42.


1791 Patella conchacea Gmelin, Syst. Nat. ed. 13, p. 3708.


1817 Nacella mytiloides Schumacher, Essai Vers test., p. 179.


1819 Patella cymbularia Lamarck, Anim. sans Vert., vol. 6, p. 335.


1831 Patella cymbuloides Lesson, Voy. de la Coquille, p. 422.


1845 Patella hyalina Philippi, Arch. f. Naturg., vol. 11, p. 59.


1845 Patella cymbium Philippi, Arch. f. Naturg., vol. 11, p. 60.


1845 Patella vitrea Philippi, Arch. f. Naturg., vol. 11, p. 60.


1869 Nacella compressa Rochebrune & Mabille, Mission scient. Cap Horn, vol. 6, p. 98, pl. 5, fig. 9.


1913 Nacella falklandica Preston, Ann. Mag. Nat. Hist., ser. 8, vol. 11, p. 221, pl. 4, fig. 6.


1950 Nacella mytilina Helbling, Carcelles, Anales del Museo Nahuel Huapi, vol. 2, p. 52 (Kerguelen).


1951 Nacella mytilina Helbling Powell, Discovery Rep., vol. 26, p. 80.


1964 Nacella mytilina Helbling, Dell, Rec. Domin. Mus., vol. 4, no. 20, p. 273.



Records-STRAITS OF MAGELLAN (type locality): Punta Arenas; St. Martin's Cove, Hermite Island, Cape Horn. PAT­AGONIA: mouth of Santa Cruz River. FALKLAND ISLANDS (all AWBP coll.). KERGUELEN ISLAND: Swain's Bay, intertidal and Antares Island, intertidal (BANZARE Sta. 48 and Sta. 61)."



(Powell, 1973: 192)


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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