{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T19:13:44Z","timestamp":1789758824443,"version":"4.0.1"},"reference-count":36,"publisher":"Cambridge University Press (CUP)","license":[{"start":{"date-parts":[[2021,4,5]],"date-time":"2021-04-05T00:00:00Z","timestamp":1617580800000},"content-version":"unspecified","delay-in-days":94,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Helminthol."],"published-print":{"date-parts":[[2021]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>During a parasitological survey of fishes at Iguazu National Park, Argentina, specimens belonging to the allocreadiid genus<jats:italic>Auriculostoma<\/jats:italic>were collected from the intestine of<jats:italic>Characidium heirmostigmata<\/jats:italic>. The erection of the new species is based on a unique combination of morphological traits as well as on phylogenetic analysis.<jats:italic>Auriculostoma guacurarii<\/jats:italic>n. sp. resembles four congeneric species \u2013<jats:italic>Auriculostoma diagonale<\/jats:italic>,<jats:italic>Auriculostoma platense<\/jats:italic>,<jats:italic>Auriculostoma tica<\/jats:italic>and<jats:italic>Auriculostoma totonacapanensis<\/jats:italic>\u2013 in having smooth and oblique testes, but can be distinguished by a combination of several morphological features, hosts association and geographic distribution. Morphologically, the new species can be distinguished from both<jats:italic>A. diagonale<\/jats:italic>and<jats:italic>A. platense<\/jats:italic>by the egg size (bigger in the first and smaller in the last); from<jats:italic>A. tica<\/jats:italic>by a shorter body length, the genital pore position and the extension of the caeca; and from<jats:italic>A. totonacapanensis<\/jats:italic>by the size of the oral and ventral sucker and the post-testicular space. Additionally, one specimen of<jats:italic>Auriculostoma<\/jats:italic>cf.<jats:italic>stenopteri<\/jats:italic>from the characid<jats:italic>Charax stenopterus<\/jats:italic>(Characiformes) from La Plata River, Argentina, was sampled and the partial 28S rRNA gene was sequenced. The phylogenetic analysis revealed that<jats:italic>A. guacurarii<\/jats:italic>n. sp. clustered with<jats:italic>A. tica<\/jats:italic>and these two as sister taxa to<jats:italic>A.<\/jats:italic>cf.<jats:italic>stenopteri<\/jats:italic>. The new species described herein is the tenth species in the genus and the first one parasitizing a member of the family Crenuchidae.<\/jats:p>","DOI":"10.1017\/s0022149x21000109","type":"journal-article","created":{"date-parts":[[2021,4,5]],"date-time":"2021-04-05T13:22:26Z","timestamp":1617628946000},"source":"Crossref","is-referenced-by-count":7,"title":["Description of a new species of<i>Auriculostoma<\/i>(Digenea: Allocreadiidae) from<i>Characidium heirmostigmata<\/i>(Characiformes: Crenuchidae) from Argentina, using morphological and molecular data"],"prefix":"10.1017","volume":"95","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7177-333X","authenticated-orcid":false,"given":"M.M.","family":"Montes","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Barneche","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y.","family":"Croci","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Balcazar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Almir\u00f3n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Martorelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G.","family":"P\u00e9rez-Ponce de Le\u00f3n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2021,4,5]]},"reference":[{"key":"S0022149X21000109_ref6","first-page":"5","article-title":"Visibilizando lo invisible. 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