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EN
Diclidophoroides maccallumi Price, 1943 and Neoheterobothrium paralichthyi sp. n. were collected from the gills of Urophysis brasiliensis (Gadiformes) and Paralichthys patagonicus (Pleuronectiformes) respectively in the southwestern Atlantic Ocean. The similarities and differences among the genera Neoheterobothrium Price, 1943, Choricotyle van Beneden et Hesse, 1863, Heterobothrium Cerfontaine, 1895 and Orbocotyle Euzet et Suriano, 1975 are discussed. The species and genera belonging to the family Diclidophoridae Cerfontaine, 1895 from the southwestern Atlantic Ocean are listed, and the distribution ranges of Diclidophoroides and Neoheterobothrium are extended to this region.
EN
Erpocotyle microstoma (Brooks, 1934) Yamaguti, 1963, parasite of Sphyrna (Platysqualus) tudes (Valenciennes, 1822), is redescribed. E. schmitti sp. n., parasite of Mustelus schmitti Springer, 1939, is described. The systematic position of E. tudes (= Neoerpocotyle tudes) Cordero, 1944 and E. platensis ( = N. platensis) Mañé Garzón et Holcman-Spector, 1968 is discussed, concluding that both species are synonyms of E. microstoma. According to the present study, the family Hexabothriidae Price, 1942, is represented in the Southwestern Atlantic Ocean by two genera: Callorhynchocotyle Suriano et Incorvaia, 1982 and Erpocotyle Van Beneden et Hesse, 1863, and by three species: C. marplatensis Suriano et Incorvaia, 1982, E. microstoma (Brooks) Yamaguti, 1963, and the herein proposed E. schmitti sp. n.
EN
Ancyrocephalid parasites from fishes belonging to the order Siluriformes from the Paranean-Platean ichthyogeographical province (Ringuelet 1975) of the Neotropical Region were studied. Two new genera, Paramphocleithrium gen. n. and Unibarra gen. n., are defined and four new species, Vancleaveus platensis sp. n., Cosmetocleithrum longivaginatum sp. n., Paramphocleithrium bidiverticulatum sp. n. and Unibarra paranoplatensis sp. n. are described. A key for the determination of ancyrocephalid parasites from siluriform fishes of the Amazonian and Paranean-Platean provinces is proposed. Four genera of ancyrocephalid monogeneans were exclusively found in the Paranean-Platean province (Amphocleithrium, Demidospermus, Unibarra, Paramphocleithrium), one exclusively in the Amazonian province (Unilatus) and three genera were common to both provinces (Philocorydoras, Vancleaveus, Cosmetocleithrum).
EN
Three new species belonging to the genus Demidospermus Suriano, 1983 are proposed. An emended diagnosis of that genus is provided. The anatomy of the new species is described. The number and type of cephalic glands and their taxonomic importance are considered.
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