Abstract
DNA barcoding has been actively used as a method for species identification, and it will become an increasingly important method in the future. However, DNA barcoding can occasionally encounter a major problem, namely “nuclear mitochondrial DNA pseudogenes (NUMTs)”. In this paper, we report the discovery of a pseudogene in the mitochondrial COI region from aquatic heteropterans. PCR with Folmer’s universal primer set produced two different lengths of DNA sequences: a standard 658 bp sequence and a slightly shorter 652 bp sequence. The presence of an “indel” and “stop codon” in the shorter sequence made them separable. We recommend using the “HCOoutout” primer as a downward primer for amplification of the COI region of aquatic heteropterans, especially corixid water bugs.
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