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 Paraplanocera oligoglenoides Ramos-Sánchez, Bahia & Bastida-Zavala, 2019 . Paraplanocera oligoglenoides Ramos-Sánchez et al. , 2019: 48–53 , figs 10a–h, 11a–h ( type locality: Agua Blanca Beach, Puerto Escondido, Oaxaca , Mexico , 15°43′58″ N , 96°48′40.21″ W ). Distribution Agua Blanca, Camarón, Panteón and Puerto Ángel Beaches and in Cacaluta Bay, Oaxaca . This is the first record of the genus from the southern Mexican Pacific. Habitat Benthic, littoral to sublittoral ( 12 m ); under rocks, associated with encrusting bryozoans, green seaweed and chitons. Remarks Paraplanocera oligoglenoides differs from P. oligoglena in the dorsal coloration pattern, the number of cerebral eyes, the intramuscular content of the surrounding spaces of the cirrus sac cavity, the epithelium of the accessory prostatic vesicle, and the orientation, position and morphology of the vagina and bursa copulatrix (see discussion of Ramos-Sánchez et al. 2019 ). Paraplanocera oligoglenoides has a cirrus sac with spines distributed throughout the sac, paired conspicuous teeth, and lacks a penis papilla. It’s Lang’s vesicle is situated dorsal to the bursa copulatrix (sagittal view). The species also features a folded-elongate pharynx, with the mouth situated in the last third of the pharynx.