The presence of four Monogenoidea parasitic on marine fishes from the central Peruvian coast is recorded. One of them, Anoplocotyloides chorrillensis (Monocotylidae) described from the gills of Rhinobatos planiceps (Rhinobatidae) is considered a new species. The three other species are: Caballerocotyla autralis Oliva, 1986 (Capsalidae); Callorhynchocotyle marplatensis Suriano & Incorvaia, 1982 (Hexabothriidae) and Anoplocotyloides papillatus (Doran, 1953) (Monocotylidae) parasitic on Sarda chiliensis chiliensis (Scombridae), Callorhinchus callorhinchus (Callorhinchidae) and Rhinobatos planiceps (Rhinobatidae) respectively.
monogenoidea; fish parasites; southeastern Pacific; Perú