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 Thysanozoon sp. (fide Brusca 1980 ) Thysanozoon sp. – Brusca 1980: 72–73 (locality: Puerto Peñasco, Sonora ). Distribution Gulf of California, Mexico . Habitat Benthic. Remarks Brusca (1980) made a partial description of Thysanozoon sp. , determining that the generic character is the presence of dorsal papillae. The species is characterized by an oval body with a rounded posterior body margin. The dorsal surface has a brown to purple dorsal coloration with pale pigmentation and white and purple-brown speckles; the body margin is reticulate with white and light purple stripes. The dorsal papillae have white spots, small dorsal papillae with yellow pigmentation. The species possesses prominent nuchal tentacles, as well as tentacular and cerebral eyes. The pharynx is long and narrow, located in the first third of the body.