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The synapomorphies supporting monophyly of Drepanidae include the following, according to Minet and Scoble (1998): 1. Adults with characteristic, unique abdominal tympanal organ, associated with tergosternal sclerites which connect tergum 1 with sternum 2, and having internal tympana ). 2. Secondary seta, dorso-caudad of spiracle, on larval segments A1-A8.