Rhopalomastix is only the second ant genus known to live with armoured scale insects (Diaspididae)

Rhopalomastix is a myrmicine ant distributed throughout tropical parts of Asia, with almost nothing known about its biology. Its closest relative Melissotarsus in Africa is the only ant genus known to live with diaspidid scale insects inside their nests, and to rely on these for food. Twelve colonie...

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Bibliographic Details
Published in:Insectes sociaux 2019-05, Vol.66 (2), p.273-282
Main Authors: Yong, G., Matile-Ferrero, D., Peeters, C.
Format: Article
Language:English
Subjects:
Adaptations
Ants
Bark
Biomedical and Life Sciences
Ecology, environment
Economic impact
Entomology
Food
Fruit trees
Herbivores
Impact analysis
Insects
Life Sciences
Mandible
Melissotarsus
Mutualism
Nests
Research Article
Rhopalomastix
Secretions
Silk
Silk gland
Spinning
Trademarks
Trees
Tunnels
Workers (insect caste)
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Summary:Rhopalomastix is a myrmicine ant distributed throughout tropical parts of Asia, with almost nothing known about its biology. Its closest relative Melissotarsus in Africa is the only ant genus known to live with diaspidid scale insects inside their nests, and to rely on these for food. Twelve colonies of four species of Rhopalomastix were sampled from seven tree genera in Singapore. Ants chewed tunnels under live bark, and these were occupied by many diaspidids belonging to five genera; at least two species are known to also live freely on the outside of trees. Inside ant nests, only a few diaspidids secreted their trademark shields. The association with the pupillarial Fiorinia is unexpected, since they have fewer secretions that can be used as food by the ants. Rhopalomastix and Melissotarsus workers share several morphological adaptations, including powerful mandibles and silk glands, but while the legs of Melissotarsus are modified for traction during tunnelling, those of Rhopalomastix are not. Consequently, Rhopalomastix workers are able to walk outside their tunnels, but they behaved timidly except in R. murphyi . Silk was used to repair damaged tunnels, and the spinning behaviour resembled that of Melissotarsus . Host trees do not gain protection from the ants against leaf herbivores, so they apparently get no benefits from this mutualism. We discuss the likely economic impact of this parasitic lifestyle, especially on fruit trees.
ISSN:0020-1812
1420-9098
DOI:10.1007/s00040-019-00686-z