Leptoglossus concaviusculus Berg, 1892 is a leaf-footed bug distributed in Argentina, Brazil, Paraguay, and Uruguay. In this contribution, two teratological cases in L. concaviusculus are described. The first one is a simple oligomery in a male specimen, and the second belongs to a case of atrophy on a female specimen. Possible causes of the teratosis are discussed. It is also provided the first record of parasitism by Tachinidae (Diptera) on this species.
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