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Two species of syrphid flies are reported for the first time in Argentina: the neotropical Rhingia nigra Macquart and exotic Eumerus obliquus (Fabricius). Individuals of both species were captured in the province of Misiones. Moreover, another individual of E. obliquus was reared from a decaying stem of Austrocylindropuntia subulata (Cactaceae) in the province of Tucumán. Finally, we report the presence of Eumerus strigatus (Fallén) in the province of Chubut, more than 400 km to southwest from its southernmost record. [ABSTRACT FROM AUTHOR]

Cloeon dipterum (L.) (Ephemeroptera: Baetidae) is widely distributed in temperate areas of Eurasia, whereas, in North America, it is restricted to three states of the USA and Canada, and, in South America to Chile. To confirm our hypothesis that C. dipterum has been recently introduced in Argentina, the aim of the present study was to identify the species based on molecular analyses and morphological features. To this end, nymphs were collected from three artificial habitats located in different localities of Buenos Aires province and two tributary streams of the Luján River, northeast of Buenos Aires, Argentina. Nymphs were all identified as belonging to C. dipterum thus confirming the presence of the species in Argentina. The distribution of C. dipterum in Buenos Aires, together with its absence from previously sampled sites, would indicate that the individuals recorded are introduced and already well established in the study area. [ABSTRACT FROM AUTHOR]

Two exotic spider species are reported for the first time in Argentina: Ozyptila praticola (C.L. Koch) (Thomisidae) and Microctenonyx subitaneus (O. Pickard-Cambridge) (Linyphiidae), being the former the first record from the southern hemisphere. The specimens were found in the leaf litter and under tree barks of modified environments in three localities in the southeast coast of Buenos Aires province. We propose the monitoring and study of the ecology of these new spider populations in order to elucidate potential risk for the local fauna. [ABSTRACT FROM AUTHOR]

The exotic syrphid Eumerus strigatus (Fallén) is reported for the first time in Argentina. Individuals of this species were captured in two sites distant more than 1,000 km (Villalonga, province of Buenos Aires, and Pocito, province of San Juan) associated with onion crops (Allium cepa L.). We propose the monitoring of this phytophagous hover fly because of its potential risk for this important horticultural crop. [ABSTRACT FROM AUTHOR]

New records of the invasive Western Conifer Seed Bug Leptoglossus occidentalis from Chile are given from Araucanía, Los Ríos and Los Lagos Regions. The new records extend the distribution of the species nearly 650 km southwards. [ABSTRACT FROM AUTHOR]

Vespula germanica is an invasive worldwide species that has been detected in continental Patagonia of Argentina and Chile. In this work, we extend the range of this invasive wasp in Patagonia to include the Tierra del Fuego Archipelago. We indicate the location, year and habitat of each sighting and/or collection. The expansion pattern of this species indicates that it is well established in natural and anthropogenic areas and that it has most probably depended on human transport to arrive from the continent. This short communication also provides information to take practical measures for its mitigation and control, including basic information for the citizens of the island to become aware of its presence and help it not arrive to new areas. Finally, more research is recommended for management and control of this new invasive species in Tierra del Fuego. [ABSTRACT FROM AUTHOR]

Megastigmus zebrinus Grissell (Hymenoptera: Torymidae) is reported for the first time from Argentina, associated with galls of Eucalyptus camaldulensis Dehnhardt (Myrtaceae) induced by the gall-forming wasp, Leptocybe invasa Fisher & LaSalle (Hymenoptera: Eulophidae), in Buenos Aires. Megastimus zebrinus was previously found in Australia, its home country, and South Africa. [ABSTRACT FROM AUTHOR]