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 Notocomplana saxicola ( Heath & McGregor, 1912 ) Leptoplana saxicola Heath & McGregor, 1912: 457 , 467–470, pl. 12 fig. 4, pl. 14 figs 19, 21, pl. 16 fig. 30 ( type locality: Monterey Bay, California , United States ). Notoplana saxicola – Hyman 1953a: 316–319 , figs 66–67 (new combination and new record from La Paz Bay, Baja California Sur ). Distribution Monterey Bay, McGinities, Huntington Beach, California Pacific Grove, La Paz Bay, Baja California Sur . Habitat Benthic. Remarks Heath & McGregor (1912) made the first description of the species, determining it as Leptoplana saxicola ; later Hyman (1953a) transferred the species to the genus Notocomplana based on the presence of a prominent vesicle. The present study suggests an exhaustive revision of the organisms described by these authors, due to the variants in the position and morphology of Lang’s vesicle and the orientation of the pharynx, described below: 1. The organisms described by Heath & McGregor (1912) have an oval Lang’s vesicle positioned anterior to the female gonopore and oriented toward the anterior region of the body; and a pharynx oriented toward the posterior region of the body ( Heath & McGregor 1912 : pl. 12 fig. 4; pl. 16 fig. 30). 2. Specimens described by Hyman (1953a) have an oval Lang’s vesicle positioned posterior to the female gonopore and oriented toward the posterior region of the body; and a pharynx oriented toward the anterior region of the body ( Hyman 1953a: 316 , 320, figs 66, 68).