This study presents for the first time, a classification of immature Plecoptera Brazilian
Amazon based on specimens collected during the development of the thesis and other
existing collections that were borrowed for the study (INPA, MZUSP, IEPA, MPEG).
The classification is based on external morphological characters, both, those already
used by other authors as others added in this study. Recent collections were made at
the following locations (bacins of Apeú River and Peixe-boi River, Mountain Martírios-
Andorinhas, National Forest Caxiuanã, National Forest Amapá, Mountain Tepequém).
Collection methods in the field was done by net for aquatic insect with 0.4 cm mesh,
steel sieve with 0.7 cm mesh and trawl with 0.3 cm mesh. After harvesting the nymphs
were screened in plastic trays and copies in advanced stage of development, were
packed in small styrofoam box and then transported to creation. Nymphs were grown
to adults to obtain the precise relationship there between. We describe the techniques
of creating new methods in plastic cups made in the very stream where they were
collected and cement tank in Campus Research Goeldi Museum. Physic-chemical
parameters were measured in the water collection sites as temperature, pH, dissolved
oxygen and electrical conductivity, and environmental characterization of the type of
background, adjacent forests. The material studied contains: nymphs of various instars
that were not associated with adults, nymphs and exúviae that were created and
associated with adults, adults obtained by collection and by creating nymphs. The
immature been described using the terminology Hynes (1941), Harper & Stewart
(1984), Froehlich (1984), Couceiro & Hamada (2003) and Olifiers et al. (2005). Were
described six nymphs of the species Anacroneiria marlieri, A. minuta, A. manauensis,
Macrogynoplax delicata, M. pulchra and Enderleina froehlichi; nymphs of fourteen
morphospecies, eleven of Anacroneuria genus: A. sp. n. 1, A. sp. n. 2, A. sp.JMFR1,
A. sp.JMFR2, A. sp.JMFR3, A. sp.JMFR4, A. sp.JMFR5, A. sp.JMFR6, A. sp.JMFR7,
A. sp.JMFR8, A. sp.JMFR9, A. sp.JMFR10, A. sp.JMFR11, two of Macrogynoplax
genus: M. sp.JMFR1, M. sp.JMFR2 and one of Enderleina: E. sp.JMFR1. The
morphospecies are certainly new species to be described in due course after the
association with adults. It presents, for the first time, a sort key for the species and
morphospecies of immature Brazilian Amazon.
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