Physophora hydrostatica Forskål, 1775

Distribution in South America: Pacific Ocean, Colombia, from 6°N to 3°N (Alvariño 1976; Cely & Chiquillo 1993), Peru, from 7ºS to 10ºS (IMARPE, database), Chile, at 36ºS off Concepción (R. Giesecke, pers. comm.), at 43ºS 74ºW off Boca del Guafo (Palma & Rosales 1997); Atlantic Ocean, Brazil to Argentina, from 0º to 55ºS (Alvariño 1981; Dias 1994; Pugh 1999; Migotto et al. 2002; Araujo 2006, 2012; Silveira & Morandini 2011; specimens collected in this study).

Habitat: neritic and oceanic species, with circumtropical distribution. In Peruvian waters, found in superficial layers (Alvariño 1971, 1981; Pugh & Gasca 2009; Araujo 2012; specimens collected in this study).