Key to Afrotropical Tetramorium solidum species group (Outdated)

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

A contemporary key can be found here: Key to Afrotropical Tetramorium solidum species group.

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return to couplet #1


return to couplet #1

Tetramorium peringueyi casent0901179 p 1 high.jpg
Tetramorium peringueyi casent0901179 d 1 high.jpg
  • Antennal scapes only with pubescence, without erect hairs similar to those on hind tibiae ..... Tetramorium dichroum
Tetramorium dichroum casent0280905 p 1 high.jpg
Tetramorium dichroum casent0280905 d 1 high.jpg


return to couplet #2

  • Appressed silvery hairs long dense and strap-like, overlapping one another especially on vertex and alitrunk, very conspicuous. Sculpture of first gastral tergite mostly obscured by size and density of the hairs. CI 101 - 105 ..... Tetramorium galoasanum
Tetramorium galoasanum casent0901178 p 1 high.jpg
Tetramorium galoasanum casent0901178 d 1 high.jpg
  • Appressed hairs sparse and spaced out on dorsal surfaces, not strap-like or overlapping. Sculpture of first gastral tergite clearly visible basally, not obscured by the hairs. CI 94-100 . . . . . 5


return to couplet #4

  • With the gaster in profile the base of the first tergite forming a thick, laterally projecting downcurved flange which overhangs the tergosternal suture basally and partially obscures the base of the sternite. First gastral tergite sculptured basally but this is absent from the posterior half of the sclerite. Red-brown or red species ..... Tetramorium setuliferum
  • With the gaster in profile the base of the first tergite not projecting as above, the tergosternal suture and base of the sternite not concealed. First gastral tergite usually finely sculptured from base to apex. Blackish brown to black species ..... Tetramorium clunum
Tetramorium clunum casent0217964 p 1 high.jpg
Tetramorium clunum casent0217964 d 1 high.jpg


return to couplet #2

  • With the alitrunk in profile the dorsum without standing hairs of any description. Usually hairs are absent but rarely appressed or flattened stud-like hairs are present . . . . . 7
  • With the alitrunk in profile the dorsum with standing hairs which are longer than broad. May be reduced to 1- 3 pairs (beware abraded specimens) ..... Tetramorium solidum
Tetramorium solidum casent0217978 p 1 high.jpg
Tetramorium solidum casent0217978 d 1 high.jpg


return to couplet #6

Tetramorium jordani casent0901180 p 1 high.jpg
Tetramorium jordani casent0901180 d 1 high.jpg
  • Propodeum bispinose or with a pair of elongate sharp triangular teeth . . . . . 8


return to couplet #7

  • Postpetiole extremely broadened by lateral alar appendages so that in dorsal view it is almost as broad as the pronotum. Petiole node in dorsal view very much broader than long ..... Tetramorium grandinode
Tetramorium grandinode casent0280904 p 1 high.jpg
Tetramorium grandinode casent0280904 d 1 high.jpg
  • Postpetiole much narrower than pronotum in dorsal view, globular or subglobular, without lateral alar appendages or only with vestiges of such. Petiole node in dorsal view varying from as broad as long to slightly broader than long . . . . . 9


return to couplet #8


return to couplet #9

  • Propodeal spines short and broad, triangular and acute, the basal width of each spine greater than its length ..... Tetramorium glabratum
Mbanyana taxonomy 2013-37Fig21B.jpg
Mbanyana taxonomy 2013-37Fig21C.jpg
  • Propodeal spines long, each spine distinctly much longer than its basal width ..... Tetramorium rufescens
Tetramorium rufescens casent0217976 p 1 high.jpg
Tetramorium rufescens casent0217976 d 1 high.jpg


return to couplet #9

  • Anterior clypeal margin with an extensive broad, deeply concave median emargination which occupies about half the width of the margin ..... Tetramorium signatum
Tetramorium signatum casent0280906 p 1 high.jpg
Tetramorium signatum casent0280906 d 1 high.jpg
  • Anterior clypeal margin with a shallow narrow median notch or indentation, scarcely visible in some specimens . . . . . 12


return to couplet #11

  • Head in full-face view as broad or broader in front of eyes than behind (Fig. 21). Costulate sculpture of dorsal head fine, reaching to occipital margin. Eyes larger, 0.29-0.31 x HW; CI 84-89; HW < 1.00 ..... Tetramorium pogonion
Tetramorium pogonion castype13390 profile 1.jpg
Tetramorium pogonion castype13390 dorsal 1.jpg
  • Head in full-face view narrowing anteriorly, narrower in front of eyes than behind. Costulate sculpture of dorsal head very feeble, fading out behind level of eyes and replaced by fine superficial punctulation. Eyes smaller, 0.24-0.26 x HW; CI 94-97; HW > 1.20 ..... Tetramorium barbigerum
Tetramorium barbigerum castype13386 profile 1.jpg
Tetramorium barbigerum castype13386 dorsal 1.jpg