Ciliate symbionts of bivalves with notes on their worldwide geographic distribution Author Mayén-Estrada, Rosaura 0000-0002-3156-1295 Laboratorio de Protozoología, Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma México, Av. Universidad 3000, Circuito Ext. s / núm. Coyoacán, C. P. 04510 Ciudad de México, Mexico rme2@ciencias.unam.mx Author Dávila, Sthefane 0000-0001-6494-309X Museu de Malacologia Prof. Pinto de Oliveira, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil sthefanedavila@hotmail.com Author Dias, Roberto Junio Pedroso 0000-0002-2404-4337 Laboratório de Protozoologia, Programa de Pós-graduação em Biodiversidade e Conservação da Natureza, Universidade Federal de Juiz de Fora, CEP: 36036 - 900, Juiz de Fora, Minas Gerais, Brazil rjuniodias@hotmail.com text Zootaxa 2024 2024-05-14 5448 4 451 481 http://dx.doi.org/10.11646/zootaxa.5448.4.1 journal article 10.11646/zootaxa.5448.4.1 1175-5326 11232169 3ED1DBDA-74B4-496B-8630-89CAFF5DB29A Peniculistoma mytili ( Morgan, 1925 ) Hosts and countries: Mytilus edulis , Denmark ; France ; Poland ; Portugal *; Sweden ; UK ; USA ; Baltic Sea; Barents Sea; White Sea; Atlantic Coast of North America. Mytilus galloprovincialis , Turkey . Polymesoda caroliniana , Mexico *. Rangia cuneata , Mexico *. Rangia flexuosa [cited as Rangia ( Rangianella ) flexuosa ], Mexico *. References: Fenchel (1965) ; Raabe (1971) ; Dolan &Antipa (1985) ; Madrazo-Garibay & López-Ochoterena (1988a) ; dos Santos & Coimbra (1995) ; López-Ochoterena (1999) ; Özer & Güneydag (2013 , 2014 , 2015 ); Krapivin et al. (2018) . (* Cited as Conchophthirius mytili ).