Sipunculus (Sipunculus) nudus Linnaeus, 1766: 1078;

type locality: European Ocean. — Steinbeck & Ricketts 1941: 346 (in mud, El Mogote, Baja California Sur; in sand, Bahía de los Ángeles, Baja California, Mexico). — Fisher 1952: 376–377, pl. 18 (Guaymas, Sonora, lagoon at Miramar Beach, 6 mi. from Ensenada; El Mogote, near La Paz, Baja California Sur; Estero de Punta Banda, Baja California, Mexico). — Brusca 1980: 125 (Gulf of California). — Cutler et al. 1992: 153 (Point Morales, Gulf of Nicoya, Costa Rica, intertidal to 12 m in mud and sand). — Dean 2001: 86 (Puntarenas, Costa Rica, intertidal to 18 m, in mud and sand). — Schulze et al. 2007: 186 (Taboguilla Island, off Panama City, Panama). — Spongberg 2006: 30, fig. 1d (sandflats, Gulf of Nicoya, Costa Rica). — Melwani & Kim 2008: 171 (sediments outside hydrothermal vents, Concepción Bay, Baja California Sur, Mexico). — Hermoso-Salazar et al. 2013: 328–329 (Wagner and Consag Basins, Gulf of California, 59–162 m, sandy loam bottom). — Berrú & Berrú 2013: 245–252 (North of Peru). Questionable records in the TEP.