David Barros-Garcia thanks for your reply.Here i am using COI gene to decipher taxonomic relation of various species of Culicoides belonging to the order Diptera.
My result showing 92% percent identity with a published gene sequence in NCBI blast with query cover grater than 95% and E value 0.
Well, 8% of divergence looks pretty high to me, but I am not familiar with genetic distances in Diptera, so I could be wrong...
Anyway, I have attached a pdf with a well known manuscript about DNA barcoding and Taxonomy of Diptera, I hope it would help you to interpret the result you have obtained!