Refers to the posterior-most body part that forms the apparent abdomen. Morphologically the gaster consists of abdominal segments 3–7 or 4-7 depending on whether there is a postpetiole.

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith