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Mitochondrial molecular marker COI was tested for use in species identification of selected species of genus Folsomia (Collembola). Marker was succesfuly amplified and sequenced. Dendrogram constructed by Neighbor-Joining method with Kimura-2-Parameter model grouped all individuals into presumed species clusters and high intraspecific variability of F. quadrioculata suggests the existence of cryptic species. Furthermore, 65 % of mitochondrial geonome of F. candida was obtained with 16 tRNA genes, 9 proteincoding genes and 2 rRNA genes identified. So far the genome characteristics correspond to the one described in G. hodgsoni.