An abdomen segment is one ring of the rear section of an insect's body. Count the abdomen segments, a swollen abdomen segment, the last abdomen segment.
The number of them helps identify a species, which is why they are counted under a lens. Each abdomen segment carries a pair of breathing holes called spiracles.
1nounabdomen segmentOne ring of the rear section of an insect's body.
“The key turns on whether the fourth abdomen segment is banded.”
abdomen segment is a body part.
Practised in Insects & Sea Life