Striking polymorphism among infertile helpers in the arboreal ant Gesomyrmex

Christian Peeters, , , Roberto A. Keller, & Mathieu Molet
Gesomyrmex (subfamily Formicinae) is a poorly known arboreal ant from the Oriental tropics. We sampled colonies in three localities (NE Thailand, peninsular Malaysia, and Sabah) and examined inhabitants of ten nests inside living branches. None of the nests had a reproductive dealate queen, indicating colonies are polydomous. We distinguished three sterile castes using discrete morphological traits, morphometry and total body size. Observations of behaviour are challenging in tree canopies, and we use functional morphology to...
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