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6. Petiole conspicuous, quadrate to longer than broad (a1). Fringe setae about 0.5x forewing width in macropterous forms; some females (a1) brachypterous. [Malar sulcus split ventrally, fronto-facial sutures extending above median ocellus to near top of eye]
6'. Petiole much broader than long, not conspicuous. Fringe setae usually shorter than 0.5x forewing width; no known brachypterous forms. [Malar sulcus split and fronto-facial sutures extending to near top of eye in Thripobius, but not in Ceranisus].
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Image credits: modified from Yoshimoto (1981).