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. Hemocytes are insect immune cells which are responsible for processes of phagocytosis, encapsulation, and coagulation. This study aim to characterize the hemocyte cells in two species amazon blackflies: Ectemnaspis rorotaense (Floch & Abonnenc) and Ectemnaspis trombetense (Hamada, Py-Daniel & Adler). Black fly larvae and pupae were collected from streams in Presidente Figueiredo Municipality, Amazonas State, Brazil. Hemolymph of 36 individuals of E. rorotaense (12 larvae, 12 pupae and 12 adults) and 38 of E. trombetense (12 larvae, 12 pupae and 14 adults) were collected and the cells were characterized by light microscopy; 200 adults of each species were used to transmission electron microscopy study. In this work were showed, by the first time, the hemocyte cells of black flies amazon. Four cell types were identified: prohemocytes, granulocytes, oenocytoids, and plasmatocytes. Prohemocytes were the smallest cells and they exhibited a high nuclear-cytoplasmic ratio. Granulocytes possessed large, eccentric nuclei, and they were characterized by the presence of granules that differed in size and shape. Oenocytoids presented poorly developed nucleus with localization in central region. Plasmatocytes showed more morphological variations and large projections in the cytoplasmic membrane. The prohemocytes were the most frequent in E. rorotaense , with nearby 45% of total cells, whereas plasmatocytes and granulocytes, each one with 38%, were the most abundant in E. trombetense . This study showed that prohemocytes, granulocytes, oenocytoids, and plasmatocytes were present in the hemolymph of E. rorotaense and E. trombetense during all stages. Caracterizacao Morfologica de Hemocitos em Ectemnaspis rorotaense (Floch & Abonnenc) e Ectemnaspis trombetense (Hamada, Py-Daniel & Adler) (Diptera: Simuliidae) Resumo. Os hemocitos sao celulas do sistema imune dos insetos responsaveis pelos processos de fagocitose, encapsulacao e coagulacao. O objetivo desse trabalho foi caracterizar os hemocitos nos simulideos amazonicos, Ectemnaspis rorotaense (Floch & Abonnenc)e Ectemnaspis trombetense (Hamada, Py-Daniel & Adler). Larvas e pupas de simulideos foram coletadas em igarapes no municipio de Presidente Figueiredo, Amazonas, Brasil. Para caracterizacao celular atraves da microscopia optica, foi coletada a hemolinfa de 36 especimes (12 larvas, 12 pupas e 12 adultos) de E. rorotaense e 38 especimes (12 larvas, 12 pupas e 14 adultos) de E. trombetense . Para o estudo com microscopia eletronica de transmissao, 200 adultos de cada especie foram utilizados. Neste trabalho foram descritos, pela primeira vez, os hemocitos de simulideos amazonicos. Foram identificados quatro tipos celulares em larvas, pupas e adultos: prohemocitos, plasmatocitos, granulocitos e oenocitoides. Os prohemocitos, com um nucleo volumoso em relacao ao citoplasma, se mostraram as menores celulas. Os granulocitos foram caracterizados pela presenca de grânulos de diferentes tamanhos e formas e um nucleo grande e excentrico. Os oenocitoides revelaram nucleo pouco desenvolvido, geralmente localizado na regiao central. Os plasmatocitos apresentaram grandes projecoes da membrana citoplasmatica e maior variacao morfologica. Os prohemocitos foram as celulas mais frequentes em E. rorotaense com 45% do total das celulas , enquanto os plasmatocitos e granulocitos, ambas com 38% cada, foram as mais abundantes em E. trombetense. Esse estudo mostrou que prohemocitos, granulocitos, oenocitoides e plasmatocitos sao presentes na hemolinfa de E. rorotaense and E. trombetense durante todos os estagios.

entomobrasilis

Morphological characterization of hemocytes in Ectemnaspis rorotaense (Floch &amp; Abonnenc) and Ectemnaspis trombetense (Hamada, Py-Daniel &amp; Adler) (Diptera: Simuliidae)