Chaves de identificação para famílias e gêneros de gerromorpha e nepomorpha (Insecta: Heteroptera) na Amazônia central / Keys to families and genera of gerromorpha and nepomorpha (Insecta: Heteroptera) in the central Amazonia, Brazil

São poucos os estudos sobre Gerromorpha e Nepomorpha aquáticos e semi-aquáticos (Heteroptera) realizados no Brasil, sendo Minas Gerais o estado onde esses insetos foram mais estudados. Este trabalho tem como objetivo apresentar chaves de identificação de adultos de Gerromorpha e Nepomorpha como ferramenta para estudos ecológicos sobre esses grupos de insetos aquáticos na Amazônia Central. Os exemplares utilizados para elaboração das chaves taxonômicas foram coletados nos municípios de Presidente Figueiredo (riachos e lagos artificiais) e Manaus (riachos, lagos de várzea e igapó). Espécimes pertencentes ao acervo da Coleção de Invertebrados do Instituto Nacional de Pesquisas da Amazônia (INPA) também foram examinados e incluídos nas chaves de identificação. As chaves incluem 31 gêneros pertencentes a 13 famílias das duas infra-ordens estudadas.

Few studies have been done in Brazil on aquatic and semi-aquatic Gerromorpha and Nepomorpha (Heteroptera), Minas Gerais being the state where these insects have been studied the most. The present study presents keys for identification of Gerromorpha and Nepomorpha adults, thus providing a tool for ecological studies on aquatic insects in Central Amazonia. The specimens used to elaborate the taxonomic keys were collected in Presidente Figueiredo county in streams and artificial lakes and in Manaus county in streams, white-water floodplain (várzea) lakes and Rio Negro black-water flooded forest (igapó). Specimens from the invertebrate collection of the Instituto Nacional de Pesquisas da Amazonia (INPA) were also examined and included in the keys. Thirty one genera from 13 families of the infra-orders mentioned.

Heterópteros aquáticos oriundos do município de Mariana, MG / Aquatic Heteroptera from Mariana County, Minas Gerais, Brazil

Em coletas realizadas em ambientes lóticos e lênticos no município de Mariana, MG, foram verificados 35 gêneros e 64 espécies de heterópteros aquáticos, distribuídos em 13 famílias. Nos ambientes lênticos, foram capturadas 34 espécies e nos lóticos, 48 espécies, com espécies comuns aos dois ambientes. Nepomorpha apresentou-se com o maior número de espécies (45) com destaque para a família Naucoridae representada por12 espécies. Entre os Gerromorpha, das 19 espécies encontradas, oito foram de Veliidae e seis de Gerridae.

In surveys carried out in lotic and lentic environments in Mariana County, Minas Gerais state, Brazil, 35 genera and 64 species of aquatic and semi-aquatic Heteroptera were recorded, distributed in 13 families. Thirty four species were collected in lentic environments, while in lotic environments 48 species were collected, some of them common to both environments. Nepomorpha presented the greatest number of species (45), markedly for the family Naucoridae, represented by 12 species. Among the 19 Gerromorpha species collected, eight were Veliidae and six were Gerridae.

Desenvolvimento do Schistosoma mansoni na cavidade peritoneal de camundongos da linhagem AKR/J / Schistosoma mansoni development in the peritoneal cavity of inbred AKR/J mice

Cercariae of Schistosoma mansoni after intraperitoneal inoculation, developed and reached the sexual maturation in that site with egg production. In the AKR/J strain of mice, 7.7 of the peritoneal recovered females showed normal eggs in the uterus. No evidence of hemoglobinic pigment in their digestive tract was observed in the peritoneal recovered parasites from both strains (AKR/J and SWISS). This fact suggests that the parasites can develop without red blood cells ingestion. On the other hand, the development of the parasite with egg production in the peritoneal cavity of the AKR/J mouse reinforces the data that the lung phase is not necessary for the development of the parasite.

Schistosoma mansoni: host cell adhesion to the different stages of the parasite, in vivo

The peritoneal cavity of laboratory mice was used to study the phenomenon of host cell adhesion to different evolutive stages of the Schistosoma mansoni (cercaria, adult worm, developing and mature eggs, miracidium, young and mature daughter sporocysts). Material recovered from the peritoneal cavity 30 and 180 min after the inoculation of each evolutive form was examined with the help of a stereomicroscope. The free swimming larvae (cercaria and miracidium), and the evolutive forms producing such larvae (mature egg and mature daughter sporocyst) elicited the host cell adhesion phenomenon. In all forms but cercariae the adherent cells remained as so till 180 minutes after inoculation