Key to Afrotropical Tetramorium grassii species group

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

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NOTE: Tetramorium plumosum is keyed under the former Triglyphothrix Key


  • Mandibles striated. Spines clearly longer than the distance between them, as long as petiole peduncle. Petiole node not narrowed dorsally . . . . . 2
  • Mandibles smooth. Spines relatively short, smaller than petiole peduncle. Petiole node narrowed dorsally . . . . . 3


return to couplet #1

  • Hairs on dorsal mesosoma and first gastral tergite coarse, stout and blunt apically. Dorsum of head with numerous sharply defined narrow regular parallel rugae..... Tetramorium regulare
Tetramorium regulare casent0901187 p 1 high.jpg
Tetramorium regulare casent0901187 d 1 high.jpg
  • Hairs on dorsal mesosoma and first gastral tergite fine and acute apically. Dorsum of head with low ruglae which are not sharply defined and which are irregular, spaced out and meandering ..... Tetramorium grassii
Tetramorium grassii casent0172365 profile 1.jpg
Tetramorium grassii casent0172365 dorsal 1.jpg


return to couplet #1

  • Pronotal dorsum evenly longitudinally rugose. Petiole node in profile with a sharp anterodorsal peak ..... Tetramorium vexator
Tetramorium vexator casent0100754 p 1 high.jpg
Tetramorium vexator casent0100754 d 1 high.jpg
  • Pronotal dorsum mostly smooth, with only vestiges of sculpture. Petiole node in profile rounded, without a sharp anterodorsal peak ..... Tetramorium titus
Tetramorium titus casent0249010 p 1 high.jpg
Tetramorium titus casent0249010 d 1 high.jpg