Every 30 days the site administrators will pick a favorite macro or close-up image from one of the "Macro and Close-up" galleries to be featured on the front page of the www.photomacrography.net website.
Lovely photograph, Antonio! I agree with all the others.
Just one thing about your title: Carpenter ants are ants of the formicine genus Camponotus.
However, your picture does not show a Camponotus sp. , but a harvester ant of the genus Messor.
Betty was quicker. It is indeed a Messor. It could be Messor structor or Messor barbarus. I would wote for the second. As I photographed only structor so far, and this one is a little "strange" to me. Good work.
This ant has a very blunt mandible. I wonder if this is a very old ant. Most ant species send the oldest ant out from the nest for foraging. It has several reason. The experienced ant has more chance to survive. And an old specimen is less loss for the nest if disappear, as the workers have limited life span.
Going back to the blunt mandible, the harvester ants (mainly the soldiers) ground the seeds with their mandible. They make "ant bread" from the seeds.