Key to Afrotropical Tetramorium flabellum species group

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

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NOTE: Tetramorium flabellum is keyed under the former Triglyphothrix group

1

  • With the mesosoma in profile, the dorsum with standing hairs that are longer than broad . . . . . 2
  • With the mesosoma in profile, the dorsum without standing hairs ..... Tetramorium bellicosum
Tetramorium bellicosum casent0901203 p 1 high.jpg
Tetramorium bellicosum casent0901203 d 1 high.jpg

2

return to couplet #1

  • Strongly bicoloured species with head and gaster yellow and mesosoma black or blackish brown . . . . . 3
  • Uniformly coloured species or with gaster differing in shade from the rest of the body . . . . . 4

3

return to couplet #2

Tetramorium coloreum casent0093824 p 1 high.jpg
Tetramorium coloreum casent0093824 d 1 high.jpg
Tetramorium postpetiolatum casent0280912 p 1 high.jpg
Tetramorium postpetiolatum casent0280912 d 1 high.jpg

4

return to couplet #2

  • Petiole in profile with the anterior face high, the dorsal and posterior faces fused and forming a single continuous steep convexity, without a posterodorsal angle ..... Tetramorium invictum
Tetramorium invictum casent0175447 p 1 high.jpg
Tetramorium invictum casent0175447 d 1 high.jpg
  • Petiole in profile with the dorsal and posterior faces separate and distinct, the two separated by a sharp or rounded posterodorsal angle . . . . . 5

5

return to couplet #4

  • Base of first gastral tergite sculptured with costulae, puncturation, or both . . . . . 6
  • Base of first gastral tergite unsculptured, smooth and shining except for hair-pits . . . . . 7

6

return to couplet #5

  • Alitrunk and pedicel segments dorsally blanketed by a fine, very dense reticulate-puncturation, rugulose sculpture which is present is very feeble and secondary to the very conspicuous puncturation. All dorsal surfaces of body with dense very short and fine pilosity..... Tetramorium granulatum
Tetramorium granulatum casent0901204 p 1 high.jpg
Tetramorium granulatum casent0901204 d 1 high.jpg
  • Alitrunk and pedicel segments dorsally with a distinct wide rugoreticulum, the spaces between which are mostly smooth and without puncturation. Dorsal alitrunk and gaster with scattered long stout blunt hairs ..... Tetramorium pylacum
Tetramorium pylacum casent0425958 p 1 high.jpg
Tetramorium pylacum casent0425958 d 1 high.jpg

7

return to couplet #5

  • Dorsum of postpetiole with an unsculptured or virtually unsculptured median longitudinal strip; the dorsum distinctly less strongly sculptured than the sides and very obviously less strongly sculptured than the petiole dorsum ..... Tetramorium sigillum
Tetramorium sigillum casent0901198 p 1 high.jpg
Tetramorium sigillum casent0901198 d 1 high.jpg
  • Dorsum of postpetiole sculptured, as strongly sculptured as the sides and usually about as strongly sculptured as the petiole dorsum . . . . . 8

8

return to couplet #7

Tetramorium saginatum casent0901199 p 1 high.jpg
Tetramorium saginatum casent0901199 d 1 high.jpg
  • Species with narrower head and longer scapes, CI 84-89, SI 95-103 . . . . . 9

9

return to couplet #8

  • Lightly coloured species, uniform yellowish brown to light orange-brown ..... Tetramorium kestrum
Tetramorium kestrum casent0217077 p 1 high.jpg
Tetramorium kestrum casent0217077 d 1 high.jpg
  • Much darker species, uniform blackish brown to black . . . . . 10

10

return to couplet #9

  • Hairs on dorsum of head (discounting those on clypeus and occiput) and on first gastral tergite markedly longer than the maximum diameter of the eye ..... Tetramorium geminatum
Tetramorium geminatum casent0901196 p 1 high.jpg
Tetramorium geminatum casent0901196 d 1 high.jpg
  • Hairs on dorsum of head (discounting those on clypeus and occiput) and on first basal gastral tergite not obviously longer than the maximum diameter of the eye ..... Tetramorium ataxium
Tetramorium ataxium casent0901197 p 1 high.jpg
Tetramorium ataxium casent0901197 d 1 high.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