Resumen El monogéneo Haliotrematoides mediohamides Kritsky & Mendoza-Franco, 2009 (Monogenea: Dactylogyridae) es redescrito con base en la reexaminación de especímenes tipo (paratipos) y de especímenes recién recolectados que parasitan las branquias del pargo, Calamus brachysomus (Lockington, 1880) (Perciformes: Sparidae) (hospedero tipo), un pez nerítico capturado frente a la costa de Puerto Pizarro, Tumbes, Perú. A pesar de que este monogeneo se describió hace 12 años, esa descripción no informó algunas de las características morfológicas únicas de H. mediohamides y tampoco ofreció un dibujo completo de esta especie. Las características más importantes de H. mediohamides son: 1) un órgano copulador masculino con un extremo distal en forma de gancho, 2) un conducto vaginal no enrollado, 3) numerosas células glandulares secretoras asociadas con el pedúnculo, 4) músculos aductores extrínsecos en forma de araña articulados con las raíces superficiales de los ancoras, 5) un reservorio prostático en forma de renacuajo y 6) un conducto deferente convolvulado anteriormente. Además, se proporciona el primer dibujo de montaje completo de H. mediohamides, así como datos morfométricos. Haliotrematoides mediohamides representa el primer registro de este género en América del Sur. Haliotrematoides mediohamides es la tercera especie de dactilogirídeo registrada que infecta a C. brachysomus en Perú.

Abstract The monogenean Haliotrematoides mediohamides Kritsky & Mendoza-Franco, 2009 (Monogenea: Dactylogyridae) is redescribed based on examination of the type specimen (paratypes) and newly collected specimens parasitizing the gills of the Pacific porgy, Calamus brachysomus (Lockington, 1880) (Perciformes: Sparidae) (type host), a neritic fish captured off the coastal zone of Puerto Pizarro, Tumbes, Peru. Even though this monogenean was described 12 years ago, that description did not report some of the unique morphological features of H. mediohamides and neither did it offer a whole-mount drawing of this species. The most important characteristics of H. mediohamides are: 1) a male copulatory organ with hook-shaped distal end, 2) a non-coiled vaginal duct, 3) numerous secretory gland-cells associated with the peduncle, 4) a chandelier-shaped extrinsic adductor muscles articulated with superficial roots of the anchors, 5) a single tadpole-shaped prostatic reservoir, and 6) a vas deferens anteriorly convoluted. In addition, the first whole-mount drawing of H. mediohamides, as well as morphometric data are provided. Haliotrematoides mediohamides represents the first record of Haliotrematoides in South America. Haliotrematoides mediohamides is the third dactylogyrid species recorded to infect C. brachysomus in Peru.

ABSTRACT During a survey of helminth parasites of the brown ground snake, Atractus major Boulenger, 1894 (Serpentes: Dipsadidae) from Moyobamba, region of San Martin (northeastern Peru), a new species of Glossidiella Travassos, 1927 (Plagiorchiida: Plagiorchiidae) was found and is described herein based on morphological and ultrastructural data. The digeneans found in the lung were measured and drawings were made with a drawing tube. The ultrastructure was studied using scanning electron microscope. Glossidiella peruensis sp. nov. is easily distinguished from the type- and only species of the genus, Glossidiella ornata Travassos, 1927, by having an oblong cirrus sac (claviform in G. ornata), distinctly ovate testes (rounded testes in G. ornata) and button-like papillae on the dorsal edge of the oral sucker region (absent in G. ornata). In addition, G. peruensis sp. nov. differs from G. ornata by possessing a longer distance between testes and substantially wider oral and ventral suckers. This is the first time that a species of digenean is described and reported parasitizing snakes in Peru.