They are very different. Atta have a sophisticated way to divert water from the nest, building a lovely cone structure which disappears as they mature. Acromyrmex have a much more primitive arrangement, relying on the position of the fungus garden in relation to the entrance to avoid floods.
Atta cone
Acromyrmex octospinosus entrance.
The difference between Acro and Atta nest entrances
Post here for any notes or records of sightings in the wild. Behaviour, nuptial flights etc, everything about these ants from the Tropics!
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The difference between Acro and Atta nest entrances
Post by Acromyrmexbob » Tue Dec 29, 2015 4:09 pm
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