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1. Largest metatibial spur (a1) very large (sometimes the only spur present), longer than basal metatarsal segment. [Notauli complete]

2. Euplectrus group

1'. Metatibial spur not very large, shorter than basal metatarsal segment. [Notauli often incomplete]

couplet 5

a1

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Image credits: Wijesekara & Schauff (1997).