Parasitismo por enterozoários em baratas capturadas em Itaguaí e Paracambi, e criadas em Engenheiro Paulo de Frontin: Periplaneta americana e Leucophaea maderae

Abstract

From May to November of 1991 the following samples of cockroaches were captured manualy: 120 Periplaneta americana in Itaguaí, 120 in Paracambi, 120 from a closed colony kept in a laboratory in Engº Paulo de Frontin, and 120 Leucophaes maderae in Paracambi. The P. americana were captured in residential drain and the L. maderae were captured in fruit stocks. Every group of 120 cockroaches contained 40 adult males, 40 adult females and 40 nymphs a reseach resulted in the identification of the protozoan parasites of the roaches posterior intestines and hostparasite relation ship, by dissection of the insects and examination of the fresh intestinal content as well as after being treated with a lugol solution and mounted collored with ferric hematoxilin in canadian balsam between a slide and a cover slip. Nyctoterus ovalis, Gregarina blattarum e Lophomonas striata, were identified as parasites common to both P. americana and L. maderae, whereas Endamoeba blattae, Hexamita periplanetae and Lophomonas blattarum were found as parasites of P. americana only. This was the first metodologicaly study projected to research the protozoanfauna of cockroaches in Brazil, as well as the xviii first register of protozoan parasites of L. maderae. The prevalence of parasitism and parasitic loads were analysed per species, stadium, sex and host origin, and discused between groups, sub-grups and infragroups. N. ovalis was the prevaling species; associations occured of two, three, four and five protozoan species but 69% of mono especifec parasitism was registered among infected cochroaches.