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Of\n                      <jats:italic>c.<\/jats:italic>\n                      1030 species of fish found in this area, 100\u2013150 inhabit the deep-sea (deeper than 200 m). Only six articles concerning metazoan parasites of fish from deep-waters of SOP are known, and nine monogenean species have been reported. Currently, ten species are known in\n                      <jats:italic>Acanthocotyle<\/jats:italic>\n                      Monticelli, 1888 (Monogenea) and when stated, all of them are found in shallow waters (10\u2013100 m).\n                      <jats:italic>Acanthocotyle gurgesiella<\/jats:italic>\n                      \u00d1acari, Sepulveda, Escribano &amp; Oliva, 2018 is the only known species parasitizing deep-sea skates (350\u2013450 m) in the SPO. The aim of this study was the description of two new species of\n                      <jats:italic>Acanthocotyle<\/jats:italic>\n                      from two Rajiformes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      In September 2017, we examined specimens of two species of deep-sea skates (Rajiformes),\n                      <jats:italic>Amblyraja frerichsi<\/jats:italic>\n                      (Krefft) and\n                      <jats:italic>Bathyraja peruana<\/jats:italic>\n                      McEachran &amp; Myyake, caught at\n                      <jats:italic>c.<\/jats:italic>\n                      1500 m depth off Tocopilla, northern Chile, as a by-catch of the Patagonian tooth fish\n                      <jats:italic>Dissostichus eleginoides<\/jats:italic>\n                      Smitt fishery. Specimens of\n                      <jats:italic>Acanthocotyle<\/jats:italic>\n                      were collected from the skin of the skates. Morphometric (including multivariate analysis of proportional measurements, standardized by total length), morphological and molecular analyses (\n                      <jats:italic>LSU<\/jats:italic>\n                      rRNA and\n                      <jats:italic>cox<\/jats:italic>\n                      1 genes) were performed in order to identify the collected specimens.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The three approaches used in this study strongly suggest the presence of two new species in the genus\n                      <jats:italic>Acanthocotyle<\/jats:italic>\n                      :\n                      <jats:italic>Acanthocotyle imo<\/jats:italic>\n                      n. sp. and\n                      <jats:italic>Acanthocotyle atacamensis<\/jats:italic>\n                      n. sp. parasitizing the skin of the thickbody skate\n                      <jats:italic>Amblyraja frerichsi<\/jats:italic>\n                      and the Peruvian skate\n                      <jats:italic>Bathyraja peruana<\/jats:italic>\n                      , respectively. The main morphological differences from the closely related species\n                      <jats:italic>Acanthocotyle verrilli<\/jats:italic>\n                      Goto, 1899 include the number of radial rows of sclerites, the non-discrete vitelline follicles and the number of testes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      The two species of monogeneans described here are the only recorded parasites from their respective host species in the SPO. Assessing host specificity for members of\n                      <jats:italic>Acanthocotyle<\/jats:italic>\n                      requires clarifying the systematics of Rajiformes.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13071-019-3756-5","type":"journal-article","created":{"date-parts":[[2019,10,30]],"date-time":"2019-10-30T19:03:14Z","timestamp":1572462194000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Two new species of Acanthocotyle Monticelli, 1888 (Monogenea: Acanthocotylidae), parasites of two deep-sea skates (Elasmobranchii: Rajiformes) in the South-East Pacific"],"prefix":"10.1186","volume":"12","author":[{"given":"Luis A.","family":"\u00d1acari","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fabiola A.","family":"Sep\u00falveda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruben","family":"Escribano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1759-2797","authenticated-orcid":false,"given":"Marcelo E.","family":"Oliva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,10,30]]},"reference":[{"key":"3756_CR1","volume-title":"Metazoan deep sea fish parasites","author":"S Klimpel","year":"2009","unstructured":"Klimpel S, Busch MW, Kellermanns E, Kleinertz S, Palm HW. 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