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 Isocomides mytili (Chatton and Lwoff, 1922) Hosts and countries: Mytilus edulis , Denmark ; France ; Norway ; Sweden ; USA *; Baltic Sea. Polymesoda caroliniana , Mexico *. Rangia flexuosa [cited as Rangia ( Rangianella ) flexuosa ], Mexico *. References: Kozloff (1946a b) ; Fenchel (1965) ; Raabe (1970b) ; Madrazo-Garibay & López-Ochoterena (1988a) ; López-Ochoterena (1999) . (* Cited as Hypocomides mytili ).