Below is a picture of the propodeal spiracle of the species Cardiocondyla nuda . Click on the picture for more images of this ant.
Spiracles run along the sides of all insects and are the holes through which they breathe.
Of course, the exact shape and sculpturing of each species is different. The main reason for taking the detailed photos of each species is to show such features up close. Click on the diagram for a full-sized view. Nautilus shell painting is finally happening again. Below are the first strokes of a Jarawa woman with a chambered nautilus.