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7. Propodeum (a1) with 2 submedian carinae connected at middle, forming an H- or X-shaped structure.
7'. Propodeum (aa1) with 1 median carina that may have a basal cup but never splits posteriorly, or without complete median or submedian carinae.
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Image credits: a1: Schauff, et al. (1997). aa1: Schauff (1985b).