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Scanning electron microscope (SEM) was done in order to study dorsal, ventral and lateral sides of 1st, 2nd, 3rd, 4th and 5th nymphal instars of Triatoma arthurneivai. The five nymphal instar can be recognized based on different pronotum, mesonotum and metanotum shapes and characteristics. In the 1st instar collar, hairless areas and tubercles are absent. The 2 nd instar presents collar, hairless areas and tubercles. In the 3rd instar occurs the development of wing pads. In the 4 th instar the four wing pads are expanded, but do not reach the abdomen and in the 5th instar the anterior wing pads almost overlap the posterior ones. At the ventral side, two metasternal glands openings (1+1) were found in all five nymphal instars. Brindley's gland evaporation areas (1+1) are located at the mesopleuron, as well as an evaporation area is located at the propleuron in all nymphal instars (1+1). Foi feito estudo morfológico da face dorsal, ventral e lateral do tórax de ninfas de 1º, 2º, 3º, 4º e 5º estádios de Triatoma arthurneivai por meio de microscopia eletrônica de varredura. Os cinco estádios ninfais podem ser reconhecidos pelos caracteres morfológicos observados no pronoto, mesonoto e metanoto. No 1º estádio nota-se ausência do colar, áreas glabras e tubérculos, que estão presentes no 2º estádio. No 3º estádio inicia-se a diferenciação das aletas alares. No 4º estádio ocorre expansão das quatro aletas alares, que, no entanto, não alcançam o abdome. No 5º estádio as aletas alares anteriores praticamente recobrem as posteriores. Na face ventral dos cinco estádios ninfais percebe-se duas (1+1) aberturas das glândulas metasternais. As áreas de evaporação das glândulas de Brindley localizam-se na mesopleura. Também foram observadas duas (1+1) áreas de evaporação na propleura dos cinco estádios ninfais

Morphological study of the thorax of the five nymphal instars of Triatoma arthurneivai Lent & Martins (Hemiptera, Reduviidae, Triatominae)