Two new trochids of the genus <Emphasis Type="Italic">Antimargarita</Emphasis> (Gastropoda: Vetigastropoda: Trochidae) from the Bellingshausen Sea and South Shetland Islands,Antarctica |
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| Authors: | Cristian Aldea Diego G Zelaya Jesús S Troncoso |
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| Institution: | (1) Fundación Centro de Estudios del Cuaternario de Fuego-Patagonia y Antártica (CEQUA), Avenida Bulnes 01890, Casilla 113-D, Punta Arenas, Chile;(2) División Zoología Invertebrados, Museo de la Plata, 1900 La Plata, Buenos Aires, Argentina;(3) Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Universidad de Vigo, Campus Lagoas Marcosende, 36310 Vigo, Spain |
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| Abstract: | Two new trochids of the genus Antimargarita, A. powelli and A. bentarti, from the Antarctic waters are described here. A. powelli, from the Bellingshausen Sea, is distinguished by its rounded whorls, numerous spiral cords, a radula with seven lateral
teeth at each side of the rachidian, and an epipodium with eight pairs of tentacles. A. bentarti, from the South Shetland Islands, is characterized by having a shell outline gradated by prominent primary spiral cords,
a radula with five lateral teeth at each side of the rachidian and an epipodium with six tentacles on the left side. The diagnostic
features for Antimargarita are redefined considering both shell and anatomical features and its suprageneric placement is discussed. |
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| Keywords: | Taxonomy Antarctica Margaritinae Margaritini Southern Ocean |
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