Goeldichironomus neopictus, a new species from the southeast of Brazil: description and bionomic Information (Insecta, Diptera, Chironomidae) Susana Trivinho-Strixino and Giovanni Strixino Trivinho-Strixino, S. & G. Strixino (1998): Goeldichironomus neopictus, a new spe-cies from the southeast of Brazil: description and bionomic information (Insecta, Diptera, Chironomidae). -Spixiana 21/3: 271-278 This study describes the immature stages and adults of Goeldichironomus neopic-tus, a new species from the southeast of Brazil which lives in marginal aquatic Vegetation in lentic environments. The imago presents morphological characteris-tics of the pictus group, but with a different pattern of thoracic and abdominal coloration. Egg masses obtained from field-collected females were maintained until eclosion (nearly 44 hours). Under laboratory conditions (20-26 °C) the cohort com-pletes its life cycle in an average of 27 days (23-33 days). Through the morphometric dimensions and duration of each instar, length and weight curves for the species were constructed and some bionomic and biometric characteristics were estab-lished. Susana Trivinho-Strixino, Giovanni Strixino, Laboratörio de Entomologia Aquätica, Universidade Federal de Säo Carlos, CP. 676; 13560-905 Säo Carlos SP, Brazil. Introduction During an intensive survey program of the reservoirs in the Säo Carlos region (Säo Paulo State, Brazil) we found a new morphospecies of Goeldichironomus Fittkau, 1965, a genus with nine previously recognized species (Spies & Reiss 1996), distributed in subtropical and tropical areas from South America to southern North America and Hawaii, and occurring in littoral biotopes of Standing waters (Reiss 1974). In this article we describe the tenth species for the genus, from mature larvae, pupae and adults, and summarize bionomic and morphometric information obtained for this species from laboratory rearings. All the material examined was mounted on slides, and the morphological terminology used follows Saether (1980). The measurements are given by a mean value followed by the ranges in parentheses. Goeldichironomus neopictus, spec. nov. Types. Holotype: S imago, Säo Carlos, SP, Brazil, Represa do Monjolinho, University Campus (UFSCar), May 1982. -Paratypes: 36* imagoes, 1 6 imago and its pupal exuviae, 59 imagines, 4 pupae and 5 larvae, from the same locality, May 1982. The holotype and most paratypes are deposited in the Laboratory of Aquatic Entomology collection of the Federal University of Säo Carlos, Säo Paulo, Brazil (UFSCar). One male paratype is deposited in the Zoologische Staatssammlung, Munich, Germany. 271
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