Pheidole obscurithorax is a South American native that has been introduced to the U.S. gulf coast. 

Pensacola, Florida, USA
Pheidole obscurithorax

Pensacola, Florida, USA
Pheidole megacephala, the big-headed ant, is one of the world's most damaging invasive ant species.

Durban, South Africa
A trail of Pheidole rhea, North America's largest Pheidole species.

Tucson, Arizona, USA
A trail of Pheidole rhea, North America's largest Pheidole species.

Tucson, Arizona, USA
A soldier Eciton burchellii army ant.  The ice-tong shaped mandibles defend the colony against vertebrate predators. 

Captive colony at the California Academy of Sciences
A trail of Pheidole rhea, North America's largest Pheidole species.

Tucson, Arizona, USA
The long, sharp jaws of this Pheidole obscurithorax soldier indicate a predominately predatory species. 

Pensacola, Florida, USA
Pheidole megacephala, the big-headed ant, is one of the world's most damaging invasive ant species.

Durban, South Africa
A trail of Pheidole rhea, North America's largest Pheidole species.

Tucson, Arizona, USA
A trail of Pheidole rhea, North America's largest Pheidole species.

Tucson, Arizona, USA
A trail of Pheidole rhea, North America's largest Pheidole species.

Tucson, Arizona, USA
See photo in original gallery.
all images and text © Alex Wild 2001-2013