The polyclads (Platyhelminthes: Polycladida) from the Tropical Eastern Pacific: Commented checklist and description of a new species Author Ramos-Sánchez, Mariela 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. 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 40171C5B-90EB-4641-91FF-EA8CA2C60D23 Pericelis nazahui Ramos-Sánchez, Bahia & Bastida-Zavala, 2020 Pericelis nazahui Ramos-Sánchez et al. , 2020: 62–68 , figs 8a–i, 9a–b, 10a–f ( type locality: Yerbabuena Beach, Oaxaca , Mexico , 15°44′55.4″ N , 96°7′48.2″ W ). Distribution Central coast of Oaxaca : Panteón and Yerbabuena beaches and Cacaluta Bay. Habitat Benthic, sublittoral ( 2–10 m ). The specimens were collected under rocks, found in groups of two to three individuals per rock and alongside blue sponges, seaweed, polychaetes, and chitons. Remarks Pericelis nazahui lacks a reticular or spotted coloring pattern, but has a brown dorsal surface, with the central region of the body, the margin, and the cerebral region appearing slightly grey, whitish, or beige, and two slightly faint beige lines, each line going from the cerebral region to the pseudotentacles. It has a common gonopores, a scarce internal glandular epithelium, and lacks glandular epithelium in the penis papilla. The female reproductive system features paired uterine vesicles.