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The Siamese fighting fish\n                    <jats:italic>Betta splendens<\/jats:italic>\n                    is the type-host of\n                    <jats:italic>Senga besnardi<\/jats:italic>\n                    , the type species of the genus known only from the original description. Despite the importance of this fish species to ornamental aquaculture in Brazil, there are no prior records of this parasite in the Americas. Therefore, the present study aims to report the finding of\n                    <jats:italic>B. splendens<\/jats:italic>\n                    naturally infected with a bothriocephalidean cestode in a commercial fish farm from Brazil. In July 2024, four specimens of\n                    <jats:italic>B. splendens<\/jats:italic>\n                    exhibiting distension of the coelomic cavity were collected from an ornamental fish farm located in Patrocinio do Muria\u00e9, Minas Gerais State. The animals were euthanized and submitted to parasitological analysis. Cestodes found in the fish were fixed, stained, and mounted for study by optical microscopy, with the aim of taxonomic identification. Cestodes were observed in the intestine of 3 out of 4 evaluated\n                    <jats:italic>B. splendens<\/jats:italic>\n                    , with infection intensities of 1, 8 and 10 cestodes per host. Morphological and morphometric analyses revealed that these specimens are indistinguishable from\n                    <jats:italic>S. besnardi<\/jats:italic>\n                    , particularly in the scolex morphology. However, given the complex taxonomy and the lack of molecular data for the species, the cestodes reported here are tentatively identified as\n                    <jats:italic>Senga<\/jats:italic>\n                    sp. This study represents the first report of\n                    <jats:italic>Senga<\/jats:italic>\n                    sp. infecting ornamental fish in the American continent.\n                  <\/jats:p>","DOI":"10.1007\/s11259-026-11467-y","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:07:14Z","timestamp":1787026034000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["First report of a species of Senga (Cestoda: Bothriocephalidae) in commercial Betta splendens (Actinopterygii: Osphronemidae) in Brazil"],"prefix":"10.1007","volume":"50","author":[{"given":"Mariana Rodrigues","family":"Vale","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana Clara Fernandes","family":"de Moraes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah Portes","family":"Carneiro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe Henrique Teixeira","family":"da Mata","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordana Costa Alves","family":"de Assis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henrique C\u00e9sar Pereira","family":"Figueiredo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matheus Anchieta","family":"Ramirez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hudson Alves","family":"Pinto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2735-2562","authenticated-orcid":false,"given":"Guilherme Campos","family":"Tavares","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"11467_CR2","first-page":"89","volume":"21","author":"GB Azevedo","year":"2007","unstructured":"Azevedo GB, Madi RR, Ueta MT (2007) Metazo\u00e1rios parasitas de Astyanax altiparanae (Pisces: Characidae) na Fazenda Rio das Pedras, Campinas, SP, Brasil. 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