Abstract
Recent studies suggest that sequence analysis technique displays a tempting foreground in identifying unknown specimens of necrophagous flies. In this study, we analyzed 63 complete ITS2 sequences concerning 29 fly species to evaluate the identification potential of the ITS2 region, among of which 41 sequence entries were obtained by sequencing and 22 sequence entries were available on the line. Additionally, phenetic method was recommended to substitute for phylogenetic method because it is very difficult to align the ITS2 sequences. The neighbor-joining tree generated by clustalx1.81 allowed us to differentiate each species. Meanwhile the tree topology also suggested that the ITS2 region showed no resolution for the distinction of geographical populations of some species. The overlapping between intra- and interspecific variation revealed by sequence analyses did not affect species identification. High sequence homology between some congeneric species required further sequencing for forensic practice.
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