Morphological and molecular characterisation of digenean parasites of the Galápagos sheephead <italic>Semicossyphus darwini</italic> (Jenyns) with the re-description of <italic>Labrifer secundus</italic> Manter, 1940 (Lepidapedidae) from the Humboldt Current Large Marine Ecosystem

The Humboldt Current Large Marine Ecosystem (HCLME) is recognised as one of the largest and most productive marine ecosystems. The estimated number of teleost fish species for the Chilean coast influenced by the HCLME reaches <italic>c</italic>.1,030 but digeneans have been reported for 39 teleost species, i.e. less than 4% of the potential hosts. During a survey of parasites of the Galápagos sheephead wrasse <italic>Semicossyphus darwini</italic> (Jennyns) (Perciformes: Labridae) from off northern Chile, we obtained representatives of three digenean species, <italic>Helicometrina nimia</italic> Linton, 1910 (Opecoelidae), <italic>Proctoeces humboldti</italic> George-Nascimento & Quiroga, 1983 (Fellodistomidae) and <italic>Labrifer secundus</italic> Manter, 1940 (Lepidapedidae). <italic>Labrifer secundus</italic>, originally described from <italic>Semicossyphus pulcher</italic> (Ayres, 1854) off the coast of Baja California, Mexico is re-described. <italic>Helicometrina nimia</italic> is a common parasite from littoral fishes in the HCLME. <italic>Semicossyphus darwini</italic> is a new host for these three digenean species. [ABSTRACT FROM AUTHOR]