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Pheidole biconstricta is one of the larger and more common Pheidole in northern South America. Icononzo, Tolima, Colombia
Major and minor workers of a subterranean Pheidole species. Icononzo, Tolima, Colombia
Camponotus (Colobopsis) impressus with a pupa. Note the differences in size and shape between major and minor workers. Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus with a pupa. Note the differences in size and shape between major and minor workers. Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. Laboratory colony at the University of Central Florida, USA
Eciton burchellii army ants. Maquipucuna reserve, Pichincha, Ecuador
Orectognathus versicolor is unusual for a trap-jaw ant in having a major worker caste (the large ant at center). The function of majors in this species remains unknown; other Orectognathus lack majors. Brisbane, Queensland, Australia
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
Camponotus (Colobopsis) impressus major worker.

Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker. Laboratory colony at the University of Central Florida, USA
Camponotus (Colobopsis) impressus major worker.

Laboratory colony at the University of Central Florida, USA
See photo in original gallery.
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all images and text © Alex Wild 2001-2013