Key to Afrotropical Tetramorium aculeatum species group

This worker key is based on Bolton (1980)

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 * Tetramorium

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

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


 * Petiole in profile usually with anterior peduncle much longer than the thickness of the node at its mid-height. SI>120 ..... Tetramorium aculeatum