waist with two segments
The mesosoma and gaster connected by two waist segments referred to as the petiole and postpetiole (abdominal segments 2 and 3). Used in Antkey to separate Cerapachyinae, Myrmicinae and Pseudomyrmecinae from Amblyoponinae, Dolichoderinae, Ectatomminae, Formicinae and Ponerinae.
see also::
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