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 Tawera elliptica (Lamark, 1818) Fig. 7H Material examined. 9 spm (8 x 10 - 10 x 11 mm ). Synonymy. See Gordillo (2006) . Remarks. The morphology of this species is similar to the smallest specimens of Retrotapes exalbidus . Zelaya (2009b) showed that they can be differentiated in that Tawera elliptica has wider cords and finer interspaces and the inside of the shell is either purplish or brownish. All specimens collected during this study had a strong violet coloring on the inside of the valves. Distribution. WTSP: Valparaiso ( Hupe 1854 , Osorio and Bahamonde 1970 ). Magellanic: Gulf of Corcovado ( Cardenas et al. 2008 ), and Traiguen Island ( Reid and Osorio 2000 ); Strait of Magellan ( USNM 2010 ): Punta Santa Maria (this record), Dawson Island ( USNM 2010 ), and Carlos III Island ( Aldea et al. 2011a ); Beagle Channel ( Rochebrune and Mabille 1889 ), Ushuaia ( USNM 2010 ), Puerto Williams ( Dell 1971 ), Orange Bay ( Rochebrune and Mabille 1889 ), and Cape Horn ( USNM 2010 ); Malvinas/Falkand Islands ( Dell 1964 , Linse 1997 ), and Staten Island ( USNM 2010 ). WTSA: Rio Grande do Sul and Uruguay ( Gordillo 2006 ), and Buenos Aires Province ( Carcelles 1944 ).