patagonica, Dionisia Lahille [F.] 1915:374 [Anales del Museo Nacional de Historia Natural de Buenos Aires v. 26; ref. 5625] Rio de la Plata, San Isidro and Dock Sur, Buenos Aires, Argentina. Not treated by Renaud 2011:16 [ref. 31770]. Considered as a nomen nudum by Lacoste et al. 2021:[3] [ref. 38542], as it is lacking distinguishing characters. •Synonym of Geotria australis Gray 1851 -- (Fernholm 1990:79 [ref. 21677], Kullander & Fernholm in Reis et al. 2003:11 [ref. 27061]). •In the synonymy of Exomegas gallegensis (Smitt 1901) -- (Lacoste et al. 2021:[3] [ref. 38542]). •Synonym of Geotria macrostoma (Burmeister 1868) -- (Riva-Rossi et al. 2020:8 [ref. 37546]). Nomen Nudum. Current status: Synonym of Geotria macrostoma (Burmeister 1868). Geotriidae. Habitat: freshwater, brackish, marine.