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 Diplandros singularis Hyman, 1953 Diplandros singularis Hyman, 1953a: 341–343 , figs 101–105 ( type locality: La Jolla, California ). Diplandros singularis – Faubel 1983: 108–111 , fig. 34d (identification keys). Distribution San Clemente Island, La Jolla, California; La Ensenada, Baja California , Mexico . Habitat Benthic. Remarks Diplandros singularis has cerebro-tentacular eyes and a double male reproductive system located in the anterior part of the paired male gonopore. In addition, it has an interpolated prostatic vesicle and a Lang’s vesicle oriented towards the anterior region of the body. Hyman (1953a) was the first to describe the species, placing it in the family Leptoplanidae Stimpson, 1857 . However, she noted that the internal morphological arrangement of Diplandros is based on the internal plan of Notoplanides (review the comments of Amyris favis ).