Richness, systematics, and distribution of molluscs associated with the macroalga Gigartina skottsbergii in the Strait of Magellan, Chile: A biogeographic affinity study Author Rosenfeld, Sebastian Laboratorio de Macroalgas Antarticas y Subantarticas, Universidad de Magallanes, Casilla 113 - D, Punta Arenas, Chile & Instituto de Ecologia y Biodiversidad (IEB), Santiago Author Aldea, Cristian Laboratorio de Ecologia y Medio Ambiente, Instituto de la Patagonia, Universidad de Magallanes & Programa GAIA-Antartica, Universidad de Magallanes cristian.aldea@umag.cl Author Mansilla, Andres Laboratorio de Macroalgas Antarticas y Subantarticas, Universidad de Magallanes, Casilla 113 - D, Punta Arenas, Chile & Instituto de Ecologia y Biodiversidad (IEB), Santiago & Parque Etnobotanico Omora, Sede Puerto Williams, Universidad de Magallanes Author Marambio, Johanna Laboratorio de Macroalgas Antarticas y Subantarticas, Universidad de Magallanes, Casilla 113 - D, Punta Arenas, Chile Author Ojeda, Jaime Laboratorio de Macroalgas Antarticas y Subantarticas, Universidad de Magallanes, Casilla 113 - D, Punta Arenas, Chile & Instituto de Ecologia y Biodiversidad (IEB), Santiago & Parque Etnobotanico Omora, Sede Puerto Williams, Universidad de Magallanes text ZooKeys 2015 2015-08-31 519 49 100 http://dx.doi.org/10.3897/zookeys.519.9676 journal article http://dx.doi.org/10.3897/zookeys.519.9676 1313-2970-519-49 E6F1CD8274AD4DE59806B00AADC4771B FFCEFFC81C5BC028FF86FFA85720FF85 579018 Calliostoma nudum (Philippi, 1845) Fig. 5A Material examined. 1 spm (13 x 12 mm ). Synonymy. See Morris and Rosenberg (2005) . Remarks. Castellanos and Landoni (1989) commented that this species is a complex variable in which the species Calliostoma kophameli Strebel, 1905, Calliostoma venustulum (Strebel, 1908), and Calliostoma falklandicum (Strebel, 1908) appear to be simply different morphotypes of the species Calliostoma nudum . Accordingly, a morphological study is required that details the various examples of the species. Distribution. Magellanic: Strait of Magellan ( Castellanos and Fernandez 1976 ): eastern micro-basin of the Strait of Magellan ( Rios et al. 2003 ) and Punta Santa Maria (this record); Beagle Channel ( Osorio 1999 ) and Cape Horn ( Osorio 1999 , Linse 2002 ); Malvinas/Falkland Islands ( Rochebrune and Mabille 1889 , Strebel 1905a , 1908 ), Port Albemarle ( Strebel 1908 ), Le Maire Strait ( Strebel 1905a ), and Staten Island ( Castellanos and Landoni 1989 ). WTSA: At 38°S ( Castellanos and Fernandez 1976 ). Figure 5. A Calliostoma nudum (13 x 12 mm) B Calliostoma modestulum (15 x 13 mm) C Photinastoma taeniatum (10 x 12 mm) D Trochita pileus (22 x 10 mm) E Fusitriton magellanicus (84 x 40 mm) F Eatoniella nigra (2 x 1 mm) G Eumetula pulla (7 x 3 mm) H Savatieria meridionalis (5 x 2 mm).