Trochus ater Lesson, 1830, [Basis of the current name] Range: 38°S to 55.5°S; 74°W to 57.5°W Maximum Reported Size: 62 mm Distribution: Argentina: Buenos Aires, Rio Negro, Chubut; Tierra del Fuego, Straits of Magellan, Chile References: Rochebrune & Mabille (1889) S; Castellanos (1970a) NEW; Castellanos & Landoni (1989) M Combining Genera: Chlorostoma