. Bulletin of the British Museum (Natural History). . Fig. 11 Hirudinella ventricosa ex Naucrates ductor off Canary Isles: (A) internal details of worm reconstructed from sections;(B) sagittal section of terminal genitalia. Scale: (A) 10 mm; (B) 1 mm. Thunnus alalunga [?] Concarneau, southern Brittany, France. Dollfus (1940 : 278; as Hirudinella fusca). Thunnus alalunga [?] Golfe de Gascogne, Bay of Biscay. Aloncle & Delaporte (1970:297; 1973 : 568; 1974 : 10; as Hirudinella fused). Thunnas alalunga [?] Cote Cantabrique, Bay of Biscay, northern Spain. Aloncle & Delaporte (1970 : 297; a
![. Bulletin of the British Museum (Natural History). . Fig. 11 Hirudinella ventricosa ex Naucrates ductor off Canary Isles: (A) internal details of worm reconstructed from sections;(B) sagittal section of terminal genitalia. Scale: (A) 10 mm; (B) 1 mm. Thunnus alalunga [?] Concarneau, southern Brittany, France. Dollfus (1940 : 278; as Hirudinella fusca). Thunnus alalunga [?] Golfe de Gascogne, Bay of Biscay. Aloncle & Delaporte (1970:297; 1973 : 568; 1974 : 10; as Hirudinella fused). Thunnas alalunga [?] Cote Cantabrique, Bay of Biscay, northern Spain. Aloncle & Delaporte (1970 : 297; a Stock Photo](https://c8.alamy.com/comp/RGJ99B/bulletin-of-the-british-museum-natural-history-fig-11-hirudinella-ventricosa-ex-naucrates-ductor-off-canary-isles-a-internal-details-of-worm-reconstructed-from-sectionsb-sagittal-section-of-terminal-genitalia-scale-a-10-mm-b-1-mm-thunnus-alalunga-concarneau-southern-brittany-france-dollfus-1940-278-as-hirudinella-fusca-thunnus-alalunga-golfe-de-gascogne-bay-of-biscay-aloncle-amp-delaporte-1970297-1973-568-1974-10-as-hirudinella-fused-thunnas-alalunga-cote-cantabrique-bay-of-biscay-northern-spain-aloncle-amp-delaporte-1970-297-a-RGJ99B.jpg)
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. Bulletin of the British Museum (Natural History). . Fig. 11 Hirudinella ventricosa ex Naucrates ductor off Canary Isles: (A) internal details of worm reconstructed from sections;(B) sagittal section of terminal genitalia. Scale: (A) 10 mm; (B) 1 mm. Thunnus alalunga [?] Concarneau, southern Brittany, France. Dollfus (1940 : 278; as Hirudinella fusca). Thunnus alalunga [?] Golfe de Gascogne, Bay of Biscay. Aloncle & Delaporte (1970:297; 1973 : 568; 1974 : 10; as Hirudinella fused). Thunnas alalunga [?] Cote Cantabrique, Bay of Biscay, northern Spain. Aloncle & Delaporte (1970 : 297; as Hirudinella fusca). Xiphias gladius [?] Norfolk, England (Aug., 1863). Cobbold (1867 : 200; 1883 : 404; as Distoma clavatum). Although recorded from only two fishes in the northeast Atlantic region, it is hkely that this parasite also occurs in Katsuwonus pelamys, Euthynnus alletteratus, Coryphaena hippurus, Sarda sarda and Thunnus thynnus, especially in the southern latitudes of this region. There are several 19th-century records of this parasite (see Nigrelh & Stunkard, 1947) from these hosts in the Atlantic Ocean, but the precise region is not Usted. Aspects of biology. The life-history of this species is not known. Aloncle & Delaporte (1970, 1973, 1974) have used this parasite as a 'biological tag'. 204. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)