Siphonosoma vastum (Selenka & Bülow in Selenka, 1883):

103–104, pl. 12, fig. 171, pl. 13, fig. 179, as Sipunculus vastus; type locality: Jaluit, Marshall Islands (without details). — Cutler et al. 1992: 154 (Isla del Caño, Costa Rica, under boulders and in debris coral). — Dean 2001: 86–87 (same data as preceding). Questionable records in the TEP.