Key to Afrotropical Tetramorium angulinode species group

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

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NOTE: Tetramorium sudanense is not included in the key as the type seems to be lost.


  • Basal quarter to one half of first gastral tergite densely shagreened and opaque, this sculpture strong and very distinctive, sometimes appearing as minute striolae due to alignment of the punctulae ..... Tetramorium legone
Tetramorium legone casent0901170 p 1 high.jpg
Tetramorium legone casent0901170 d 1 high.jpg
  • Basal quarter to one half of first gastral tergite smooth or at most with a narrow band of coarse, separated punctures immediately behind the postpetiole . . . . . 2


return to couplet #1

  • Dorsal surfaces of alitrunk blanketed by a dense, very coarse and very conspicuous punctate ground-sculpture between the rugae, the entire surface dull and granular ..... Tetramorium calinum
Tetramorium calinum casent0901164 p 1 high.jpg
Tetramorium calinum casent0901164 d 1 high.jpg
  • Dorsal surfaces of alitrunk rugulose or rugose, sometimes with faint punctulation between them but this by no means dominating the sculpture; surface shining ..... . . . . . 3


return to couplet #2

  • Petiole and postpetiole dorsally completely unsculptured and shining. Promesonotum with only a few widely spaced longitudinal rugulae ..... Tetramorium minusculum
Tetramorium minusculum casent0280901 p 1 high.jpg
Tetramorium minusculum casent0280901 d 1 high.jpg
  • Petiole and postpetiole dorsally with sculpture on one or both segments. Promesonotum with dense rugulae or a rugoreticulum . . . . . 4


return to couplet #3

  • Dorsal surfaces of both petiole and postpetiole completely covered by a dense, coarse irregular rugosity or a narrow-meshed rugoreticulum, the spaces between which are usually filled with coarse punctulation so that the surfaces of both segments are matt and have a very rough appearance ..... Tetramorium zapyrum
Tetramorium zapyrum casent0901176 p 1 high.jpg
Tetramorium zapyrum casent0901176 d 1 high.jpg
  • Dorsal surfaces of petiole, postpetiole or both either with a loose open fine reticulum with shining spaces or with sculpture reduced on one or both segments so that open shining spaces are present . . . . . 5


return to couplet #4

  • In profile the length of the postpetiole node distinctly less than the length of the petiole node. Postpetiole dorsum unsculptured and smooth ..... Tetramorium chloe
Tetramorium chloe casent0235811 p 1 high.jpg
Tetramorium chloe casent0235811 d 1 high.jpg
  • In profile the length of the postpetiole node equal to or greater than the length of the petiole node. Sculpture always distinct at least in places on the postpetiole dorsum ..... Tetramorium angulinode
Tetramorium angulinode casent0901162 p 1 high.jpg
Tetramorium angulinode casent0901162 d 1 high.jpg