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If I want to compare, I think I should compare between Dictyopharidae and Cixiidae;
I should see tegulae, claval suture, shape of abdominal terga 6-8, genitalia or ovipositor and etc.
I tried to can find them with use of several sources, but in result I couldn't find suitable answer for myself.
I hope I can understand definite answer in future!!!
Again thank you very much for your lead Janet