Key to Acanthomyrmex of Thailand

This worker key is based on: Jaitrong, W., Asanok, L. 2019. Two new species of the ant genus Acanthomyrmex Emery, 1893 (Hymenoptera, Formicidae, Myrmicinae) from Thailand. ZooKeys 842: 113–134 (DOI 10.3897/zookeys.842.33609).

There are two keys, one for majors and one for minors.

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Major workers

1

• Dorsum of head with conspicuous alveolate sculpture . . . . . 2

• Dorsum of head virtually free of sculpture, smooth and shiny . . . . . Acanthomyrmex thailandensis

2

return to couplet #1

• Petiole with long, cylindrical spines laterally on apex of node; smaller species (HW 1.68–1.82 mm) . . . . . Acanthomyrmex ferox

• Such spines absent; larger species (HW > 2.05 mm) . . . . . 3

3

return to couplet #2

• Anterior half of dorsum of head rugulose; postpetiole almost as long as high, with straight dorsal outline; first gastral tergite without very short appressed hairs; dorsal and lateral faces of femora with erect hairs . . . . . Acanthomyrmex malikuli

• Anterior half of dorsum of head without rugae; postpetiole clearly shorter than high, with convex dorsal outline; first gastral tergite densely with very short appressed hairs; dorsal and lateral faces of femora without erect hairs . . . . . Acanthomyrmex mizunoi

Minor Workers

1Mi

• Petiole with long, cylindrical spines laterally on apex of node; postpetiole almost smooth . . . . . Acanthomyrmex ferox

• Such spines absent; postpetiole strongly sculptured . . . . . 2Mi

2Mi

return to couplet #1

• First gastral tergite with 0–4 erect hairs . . . . . Acanthomyrmex mizunoi

• First gastral tergite with more than 10 erect hairs . . . . . 3Mi

3Mi

return to couplet #2Mi

• First gastral tergite with about 10 relatively short erect hairs occurring only in anterior half of the segment; lateral and dorsal faces of femora lacking hairs; body reddish brown (brighter) . . . . . Acanthomyrmex thailandensis

• First gastral tergite densely with relatively long erect hairs occurring over surface; lateral and dorsal faces of mid and hind femora with sparse hairs; body dark brown (darker) . . . . . Acanthomyrmex malikuli