Methods for delimiting species based on multi-gene nucleotide information are well established and provide the means to complement the classical COI barcoding approach, whose limitations are well known. Our research project aims at establishing a standardized set of single-copy nuclear-encoded markers for genome-wide multi-locus species delimitation by exploiting comparative genomic data and applying target DNA enrichment. Candidate markers are so-called Universal Single-Copy Orthologs (USCOs).