Immature stages of Neotropical Asopinae have been poorly studied. Here, the external morphology of eggs and nymphs of Tynacantha marginata Dallas are described using light and scanning electron microscopy. The egg is barrel-shaped with smooth surface, and long aero-micropylar processes. In the first instar, the color of abdomen varies along the development from yellow to red, the dorsal plates are pale, and the surface of evaporatorium bears spiked projections. From the second, the evaporatorium surface is reticulated. From third instar, the pronotum is orange with black lateral margins. The eggs and nymphs of T. marginata are unique among Neotropical Asopinae species of which the morphology is known, allowing the early identification of the species.

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In recent years, the management of invasive stink bugs (Pentatomidae) has been a challenge in many regions of the world, including the Neotropical, where four non-native species were detected in the last two decades. Species with invasive potential include the yellow-spotted stink bug, Erthesina fullo (Thunberg). It is polyphagous and is known to cause damages to fruit crops in Southeast Asia. Herein, we report for the first time the occurrence of E. fullo in Brazil (Santos, São Paulo). Nymphs and adults have been recorded nearby the Harbor of Santos since November 2020. A fifth instar nymph was collected and reared until adulthood. The insect was found feeding on Inga sp. leaves (Fabaceae), a plant restricted to the Neotropical Region. The detection of multiple specimens in Santos, plus their ability to feed on native and or on cultivated plants, may represent a threat to the Brazilian agribusiness and environment. Keywords pest management • invasive species • iNaturalist • citizen science • hitchhiking speciesStink bugs (Pentatomidae) include some species with invasive potential (McPherson 2018). Among the characteristics that allow some species of stink bugs to establish in non-native environments, are their polyphagous habits, and their ability to survive under unfavorable conditions (as overwintering), currently magnified by the climate changes (Panizzi 2015; Esquivel et al. 2018). The more recent case of an invasive pentatomid is the brown marmorated stink bug (BMSB), Halyomorpha halys (Stål). It is currently widespread in different regions of the world, causing problems in agriculture, the environment, and people's homes (Leskey et al. 2012;Inkley 2012). In the USA, other important invasive species include Bagrada hilaris (Burmeister), Murgantia histrionica (Hahn), and Piezodorus guildinii (Westwood) .At least four non-native species of stink bugs have been reported in the Neotropics, which invasive status are still uncertain in some cases:

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Some species of Podisus Herrich-Schäffer have a confuse taxonomic history with several modifications and loss of information over time. The genus has been considered a taxonomic dumping ground in Asopinae, and its current species composition is doubtful. After examining the type specimens of Telepta distincta Stål, Arma submarginata Walker, Arma monospila Walker, Arma fuscescens Dallas, Arma caliginosa Walker, Arma turbida Walker and Podisus mellipes Bergroth, we redescribe and revalidate A. fuscescens as Podisus fuscescens rev. stat., previously considered a junior synonym of Podisus sagitta (Fabricius). The taxonomic status, morphology and distribution of P. fuscescens and P. distinctus are updated and illustrated. Arma caliginosa, A. turbida and Podisus mellipes become synonyms of P. fuscescens. Additionally, Arma submarginata Walker is removed from its synonymy with Podisus ventralis (Dallas) and treated as a synonym of P. distinctus. Podisus signoreti Fallou is removed from its synonymy with P. distinctus and treated as species inquirenda.