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This species frequently exhibits a high prevalence of parasitism by the nematode <jats:italic>Crassicauda<\/jats:italic> spp., which affects the kidney, urinary tract, and arterial walls via larval migration, and is considered one of the primary natural causes of mortality among CBWs in the Canary archipelago. Despite its significance, molecular identification of this parasite in the Canary Islands has not been systematically conducted until now. To address this gap, 51 CBW\u2019s stranded in the Canary Islands between 1999 and 2023 were necropsied, and 11 adult nematodes were collected from the kidneys of 11 CBWs. Morphological identification and molecular analyses targeting the mitochondrial <jats:italic>COX1<\/jats:italic> gene and the ITS-2 region were performed, with phylogenetic relationships within the genus <jats:italic>Crassicauda<\/jats:italic> assessed. Adult parasitism was observed in 86% of the examined animals. Morphological examination identified the species as <jats:italic>Crassicauda cf. anthonyi<\/jats:italic>, which was corroborated by molecular analyses as <jats:italic>Crassicauda anthonyi<\/jats:italic>. Renal nodular lesions associated with parasitism were characterized by granulomatous inflammation of varying severity, with intralesional nematodes, fibrosis, necrosis, and multifocal mineralization. <jats:italic>Crassicauda anthonyi<\/jats:italic> demonstrates a high prevalence and host specificity, contributing to significant renal pathology in stranded CBWs. This study provides parasite morphological data and molecular identification of <jats:italic>C. anthonyi<\/jats:italic> in the Canary Islands, enhances understanding of its prevalence, and expands both the taxonomy and genetic sequence database for the <jats:italic>Crassicauda<\/jats:italic> genus.<\/jats:p>","DOI":"10.1186\/s12917-025-04585-3","type":"journal-article","created":{"date-parts":[[2025,3,6]],"date-time":"2025-03-06T04:27:31Z","timestamp":1741235251000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Morphological and molecular characterization of Crassicauda anthonyi in Cuvier\u2019s beaked whales from the Canary Islands"],"prefix":"10.1186","volume":"21","author":[{"given":"Z.","family":"Su\u00e1rez-Gonz\u00e1lez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Fern\u00e1ndez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Colom-Rivero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N.","family":"Garc\u00eda-\u00c1lvarez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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The research exclusively involved dead stranded animals and did not include any experimentation on live animals.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"148"}}