In January 2002, were caught 11 Makaira nigricansLacepède, 1802 (Istiophoridae) and two Acanthocybium solandri(Cuvier, 1832) (Scombridae) off Cabo Frio municipality, Rio de Janeiro State, Brazil. We collected digenetic trematodes from the stomach of some of these fishes. We studied these trematodes with optical and scanning electron microscopy and identified them as Hirudinella ventricosa(Pallas, 1774) Baird, 1835. This is the first report of this species in A. solandriin the Brazilian coast, and in M. nigricansin South America.

From October 2006 to March 2008, sixty specimens of Paralichthys isosceles, were captured in the littoral of the State of Rio de Janeiro Brazil. The present study deals with the taxonomic identification of the cestodes parasitizing this fish species, as well with the analysis of parasitological indexes, sites of infection, taking into account the hygienic-sanitary importance of the host in Brazilian and foreign markets. Fifty-six (93.3%) out of the collected fishes were infected with at least one specimen of metacestodes. Diphyllobothriidea were represented by plerocercoids of two species: Diphyllobothrium sp. 1 (similar to D. latum) in stomach, stomach mucosa and mesentery and Diphyllobothrium sp. 2 (similar to D. dendriticum) in intestine, liver, ovary and abdominal cavity. Trypanorhyncha, were represented by Grillotia carvajalregorum, in stomach, intestine, liver, mesentery, abdominal...

Physaloptera galvaoi n.sp. fue registrada parasitando en el estómago de Cerradomys subflavus (Rodentia: Sigmodontinae) capturados en el Parque Nacional Serra da Canastra (São Roque de Minas, Minas Gerais, Brasil). El género Physaloptera tiene 13 especies que parasitan los roedores en todo el mundo. Entre ellos, cinco fueron registrados en las Américas. Las principales características de la nueva especie son el tamaño, la forma de la espícula y la relación de longitud de la espícula con la longitud total del cuerpo, las papilas pre y pos cloacal equidistantes en los espécimen masculinos, y el útero con cuatro hasta cinco ramas en las hembras. La nueva especie difiere de las otras especies del género Physaloptera registradas en América como Physaloptera bispiculata, Physaloptera murisbrasiliensis, Physaloptera calnuensis, Physaloptera longispicula y Physaloptera hispida por te...

Fascioliasis is an infection posing a substantial threat to public health, besides causing economic impacts due to its increasing prevalence in recent years. It is considered endemic in Peru and Bolivia and in Brazil's southern state of Rio Grande do Sul. Studies conducted with specimens of Fasciola hepatica from different geographic regions have shown that the characteristics of the adult worms and eggs vary according to host's distribution. In this study, we evaluated whether these variations also occur in specimens obtained from cattle bred in Brazil (Cordeiro in Rio de Janeiro state and Lavras in Minas Gerais) and Argentina (Catamarca and Salta provinces), using light microscopy and light microscopy with differential interference contrast. The results demonstrated differences in the specimens from each locale, mainly in the distribution and quantity of spines in the tegument. The int...