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An Acromyrmex niger leafcutter ant worker makes a characteristically circular cut in a citrus leaf. Monte Verde, Minas Gerais, Brazil
Acromyrmex niger cutting a leaf. Monte Verde, Minas Gerais, Brazil
A parasitic Apocephalus phorid fly attempts to lay her egg (note the long, snaking ovipositor) while her Acromyrmex leafcutter victim struggles to pin the attacker against her defensive spines. Monte Verde, Minas Gerais, Brazil
An Acromyrmex niger leafcutter ant worker makes a characteristically circular cut in a citrus leaf. Monte Verde, Minas Gerais, Brazil
Acromyrmex niger cutting a leaf. Monte Verde, Minas Gerais, Brazil
This worker of Acromyrmex sp. cf. octospinosus is a "sheep"- an individual covered in the furry chains of Actinomyces bacteria. The bacteria are considered beneficial to the ants, as they produce an antibiotic thought to protect the fungus garden from infection. Panama; Laboratory colony at the University of Wisconsin at Madison
Acromyrmex echinatior worker in the fungus garden. Panama; Laboratory Colony at the University of Wisconsin at Madison
Acromyrmex versicolor, the desert leafcutter. Laboratory colony at Arizona State University
Acromyrmex versicolor desert leafcutter ant carrying a fragment of a mesquite seed pod. Green Valley, Arizona, USA
This worker of Acromyrmex sp. cf. octospinosus is a "sheep"- an individual covered in the furry chains of Actinomyces bacteria. The bacteria are considered beneficial to the ants, as they produce an antibiotic thought to protect the fungus garden from infection.

Panama; Laboratory colony at the University of Wisconsin at Madison
Actinomyces bacteria. The bacteria are considered beneficial to the ants, as they produce an antibiotic thought to protect the fungus garden from infection. Panama; Laboratory colony at the University of Wisconsin at Madison" href="javascript:openLB(1132966181,'',XLarge,'',1024,874);">This worker of Acromyrmex sp. cf. octospinosus is a "sheep"- an individual covered in the furry chains of Actinomyces bacteria. The bacteria are considered beneficial to the ants, as they produce an antibiotic thought to protect the fungus garden from infection. Panama; Laboratory colony at the University of Wisconsin at Madison
This worker of Acromyrmex sp. cf. octospinosus is a "sheep"- an individual covered in the furry chains of Actinomyces bacteria. The bacteria are considered beneficial to the ants, as they produce an antibiotic thought to protect the fungus garden from infection.

Panama; Laboratory colony at the University of Wisconsin at Madison
See photo in original gallery.
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all images and text © Alex Wild 2001-2013