Key to Afrotropical Tetramorium aculeatum species group

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This worker key is based on Bolton (1980)[1]

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NOTE: Tetramorium rotundatum is known only from the queen caste.

1

  • Metapleural lobes minute or absent, always very inconspicuous. Dorsal (outer) surfaces of hind tibiae with elongate fine hairs. Petiole node in profile high and narrow . . . . . 2
  • Metapleural lobes elongate-triangular, prominent and conspicuous. Dorsal (outer) surfaces of hind tibiae with short elevated pubescence but without long fine hairs. Petiole node in profile low ..... Tetramorium rimytyum
Tetramorium rimytyum casent0901225 p 1 high.jpg
Tetramorium rimytyum casent0901225 d 1 high.jpg

2

return to couplet #1

  • Petiole in profile usually with anterior peduncle shorter than the thickness of the node at its mid-height. Rarely the two measurements approximately the same, in which case the node is stout and substantial, and SI<120 ..... Tetramorium africanum
Tetramorium africanum P casent0280920.jpg
Tetramorium africanum D casent0280920.jpg
  • Petiole in profile usually with anterior peduncle much longer than the thickness of the node at its mid-height. SI>120 ..... Tetramorium aculeatum
Tetramorium aculeatum P casent0904859.jpg
Tetramorium aculeatum D casent0904859.jpg

References

  1. Bolton, B. 1980. The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Ethiopian zoogeographical region. Bulletin of the British Museum (Natural History). Entomology. 40: 193-384