The genus Placosternum Amyot & Serville (Heteroptera: Pentatomidae) currently belongs to the tribe Pentatomini Leach with 13 described species. Species are medium to big size and are defined by having characteristic thoracic sternal structures and the pronotal lateral angles somewhat protruded and/or serrate. The genus follows a typical Indo-Malayan distribution limited by the Wallace line south-eastwards and extending to some regions of the eastern Palaearctic. The species in the genus can be considered somehow cryptic as morphologically they are similar and most of them have been classified as a single species. Additionally, as most of the species descriptions are extremely poor, after the revision of the type materials and material deposited in many of the worldwide institutions, we present the systematic knowledge on the genus.

• Marcos Roca-Cusachs(Laboratory of Systematic Entomology, Department of Applied Biology, College of Agricultural and life Sciences, Chungnam National University)
• Sunghoon Jung(Laboratory of Systematic Entomology, Department of Applied Biology, College of Agricultural and life Sciences, Chungnam National University)