R-Syst network deals about systematic and (meta) barcoding and provide curated molecular databases for species identification and provide tools for diagnosis and inventories. The stakes are at the same time a precise diagnosis of organisms of interest (for example pathogens detection), and to produce an inventory as complete as possible of various communities like microalgae, fungal communities, trees of French Guyana, bacteria, nematods and viruses (see http://www.rsyst.inra.fr/).