Gaster (insect anatomy)

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In the worker ant the metasoma is divided into the narrow petiole and bulbous gaster. The abdomen technically includes the metasoma and the propodeum which is fused to the thorax.

The gaster is the bulbous posterior portion of the metasoma found in hymenopterans of the suborder Apocrita (bees, wasps and ants). This begins with abdominal segment III on most ants, but some make a constricted postpetiole out of segment III, in which case the gaster begins with abdominal segment IV.[1][2]


  1. ^ "Ant Information". Archived from the original on 2014-10-07. Retrieved 2014-08-20.
  2. ^ "Notes from Underground-members". Archived from the original on 2013-05-17. Retrieved 2014-08-20.