First records and two new species of sipunculans (Sipuncula) from the Southern Mexican Pacific Author Silva-Morales, Itzahí ADA5A4BD-EB4E-47E3-A6A7-D3E1FDA64ED3 División de Posgrado, El Colegio de la Frontera Sur, Unidad Chetumal, Quintana Roo, Mexico. itzahi_marley.gwn@hotmail.com Author Gómez-Vásquez, Julio D. BD3A3DE1-21F5-4B54-A707-361BE8E90DB9 Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar campus Puerto Ángel, Ciudad Universitaria, Puerto Ángel, Pochutla, Oaxaca 70902, Mexico. gomezvjuliod@gmail.com text European Journal of Taxonomy 2021 2021-03-25 740 1 77 117 http://dx.doi.org/10.5852/ejt.2021.740.1283 journal article 7588 10.5852/ejt.2021.740.1283 504278d0-5689-4adb-9350-3e97392bfbf0 2118-9773 4643194 07F1B593-9F4F-4B32-88D9-ADC5CA0BEB84 Xenosiphon branchiatus (Fischer, 1895) : 3, pl. 1, figs 1–1a, 2, as Sipunculus mundanus var. branchiatus ; type locality: Esmeraldas , Ecuador . — Fisher 1947: 360–363, as Xenosiphon branchiatum (from La Paz, Baja California Sur to Panama ). — Fisher 1952: 377–380, pl. 19, as X. branchiatum (La Paz, Baja California Sur; Panama , Hassler Expedition). — Brusca 1980: 125, as X. branchiatum (Gulf of California). — Cutler et al. 1992: 154 (Curú Beach, Gulf of Nicoya; Tamarindo Beach, Costa Rica , in fine sand). — Dean 2001: 86 (Conchal Beach, Brasilito Bay; Curú Beach, Gulf of Nicoya; Tamarindo Beach, Tamarindo Bay, Costa Rica , in fine sand). — Schulze et al . 2007: 186 (Tamarindo Beach, Costa Rica ).