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The significance of the knowledge of the incidence of Dirofilaria immitis in the dog is emphasized since dirofilariasis is a zoonosis which produce subcutaneous tumors which clinical-etiological diagnosis is very difficult. Adult forms are often located in the skin. The percentage of parasitized dogs found in the Havana city is reported. One-hundred-and-two necropsies of gadder dogs depicted that 6,86% of them had Dirofilaria immitis. Results were negative in the remaining 93,13%.

Four filariae are known to parasitize the capybara "Hydrochoerus hydrochaeris" namely the "Cruorifilaria tuberocauda", Eberhard, Morales & Orihel (1976). The "Dipetalonema (Alafilaria) hydrochoerus", Yates (1983), and two "mansonella" recently described by Eberhard, Campo-Aasen & Orihel (1983), "Mansonella longicapita" and "Mansonella rotundicapita". In this study we describe the adult parasites and the microfilaria of the "Cruorifilaria tuberocauda" (Nematoda, Filarioidea), Eberhard, Morales & Orihel (1976) obtained from the arteries of the kidney of two capybaras from Apure and Barinas states of Venezuela. The pathology produced by the presence of the filariae in kidney and lungs of the animals is described as well as the blood harboring microfilaria.

Four filariae are known to parasitize the capybara "Hydrochoerus hydrochaeris" namely the "Cruorifilaria tuberocauda", Eberhard, Morales & Orihel, 1976; the "Dipetalonema (Alafilaria) hydrochoerus", Yates & Jorgenson, 1983, and "Mansonella longicapita" and "Mansonella rotundicapita [corrected]", Eberhard, Campo-Aasen & Orihel, 1983. In this study we describe briefly the adult parasites and, the microfilaria of the species "Dipetalonema (Alafilaria) hydrochoerus" which were isolated from skin nips and we have found that the capybara "Hydrochoerus hydrochaeris" is parasitized in a proportion of 80% in the 16 animals studied.