The polyclads (Platyhelminthes: Polycladida) from the Tropical Eastern Pacific: Commented checklist and description of a new species Author Ramos-Sánchez, Mariela E9D05B3F-CF64-48E3-B5ED-8D24E47F9D2A Doctorado en Ciencias Biológico Agropecuarias, Área Ciencias Biológico Agropecuaria y Pesquera, Ciudad de la cultura “ Amado Nervo ”, Tepic, Nayarit, 63000, Mexico. & Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, campus Puerto Ángel, Ciudad Universitaria, Puerto Ángel, Oaxaca, 70902, Mexico. rmariela220@gmail.com text European Journal of Taxonomy 2024 2024-10-17 962 1 1 67 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2683/12419 journal article 10.5852/ejt.2024.962.2683 2118-9773 13947260 40171C5B-90EB-4641-91FF-EA8CA2C60D23 Enchiridium magec Cuadrado, Moro & Noreña, 2017 Enchiridium magec Cuadrado et al. , 2017: 45–47 , figs 3a–f, 11d ( type locality: El Balito, Tenerife, Canary Archipelago, Spain ). Enchiridium magec – Soutullo et al. 2021: 374–376 , fig. 4b–e (new record from Carbón Beach, Las Baulas National Park of Guanacaste , Costa Rica ( 10°20′53.4″ N , 85°51′44.5″ W )). Distribution El Balito, Tenerife, Canary Archipelago, Spain ; Carbón Beach, Las Baulas National Park of Guanacaste , Costa Rica . Habitat Benthic, rocky substrates, at depths of 4–20 meters or low intertidal, below stones on sand. Remarks Enchiridium magec is a species described in the Atlantic Ocean in the Canary Archipelago by Cuadrado et al. (2017) and subsequently recorded in the Pacific Ocean in Guanacaste Costa Rica by Soutullo et al. (2021) . Enchiridium magec is characterized by an elongated body with a smooth dorsal surface. The background color is yellow with cream dots and dark brown spots in the central area, forming a continuous longitudinal midline. The species possesses cerebral eyes and a tubular pharynx. The male reproductive system features a single male gonopore, anterior to the female, with an elongated penis papilla armed with a long tubular stylet, two interpolated prostatic vesicles included in a very characteristic muscular bulb, and a seminal vesicle surrounded by a second muscular bulb. The female reproductive system presents a short, posteriorly oriented vagina, surrounded by cement glands. The present study considers the species’ record on the west coast of Central America as questionable and suggests a review of the material and the mechanisms of interoceanic dispersal of the species.