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Last update:10 April 2008

Gastral segment

Description:

One of the segments of the gaster. Four or five gastral segments are present according to the abdominal segment 3 is or is not differentiated into a postpetiole, respectively. When the abdominal segment 3 is reduced and isolated to form the postpetiole, the abdominal segment 4 is the first gastral segment (A4 = G1). When the abdominal segment 3 is not reduced and isolated, it is the first gastral segment (A3 = G1) and the abdominal segment 4 is the second gastral segment (A4 = G2).

Fig003_abdomen Fig005_petiole