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26. Propodeum with costula (a1) or transverse rugae (a2) connecting median carina to plicae.
26'. Propodeum without costula (aa1, aa2), frequently without median carina and/or plicae.
| a1 | a2 |
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| aa2 | |
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Image credits: a1, aa2: Miller (1970). a2: Yoshimoto (1983). aa1: Schauff, et al. (1997).