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An open supercluster (OSC) is defined as a cluster of at least six openclusters (OCs) born from the same giant molecular cloud (GMC). We survey therecent catalogs of OCs based on Gaia data and relevant literature to find 17OSCs of the third galactic quadrant, along with 190 likely members of them.OSCs are frequent enough to be considered an extra class of objects in thehierarchy of star formation. Some of these supersystems are new and most ofthem contain more members than previously thought. The detailed study of someOSCs has leaded to the discovery of four new young clusters that are members ofthem, named Casado-Hendy 2 to 5. In certain instances, subgroups with distinctPMs or 3D positions have been found within an OSC, suggesting the presence ofmultiple generations of stars formed from several bursts of star formationwithin the same GMC. OSCs are typically unbound and tend to disintegrate ontimescales of 0.1 Gyr. The present results support the Primordial Grouphypothesis (Casado 2022) and suggest that globular clusters are not formed fromthe accretion of open superclusters, at least in the local Universe at latetimes.

Open superclusters I: The most populated primordial groups of open clusters in the third quadrant of the Galactic disc