Key to Tetramorium chefketi species-complex workers

This worker key is based on: [[Media:Csosz 2007.pdf|Csosz S., A. Radchenko and A. Schulz. 2007. Taxonomic revision of the Palaearctic Tetramorium chefketi species complex (Hymenoptera: Formicidae). Zootaxa. 1405:1-38. PDF]]

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 * Tetramorium
 * Key to Tetramorium chefketi species-complex queens
 * Tetramorium species groups
 * Tetramorium chefketi species complex

1

 * Ventral surface of head with a row of short and several very long setae, forming a psammophore (figs 3, 4) [sometimes setae can be broken or lost]. Eyes larger, EYE = 0.185 . . . . . 2


 * Ventral surface of head with several short and a few longer straight setae, psammophore not developed (fig. 5). Eyes smaller, EYE < 0.185 . . . . . 3

2
return to couplet #1
 * Dorsum of petiolar node and postpetiole with sinuous rugae and coarse irregular reticulation. Ground surface microreticulate. Petiole much narrower than postpetiole, PEW/PPW 0.73 [0.70, 0.75] (China and Mongolia) . . . . . Tetramorium annectens


 * Dorsum of petiolar node usually with semi-circular rugulae, ground surface smooth and shiny, postpetiole longitudinally rugulose, and shiny. Petiole slightly narrower than postpetiole, PEW/PPW 0.84 [0,80; 0,88] (Afghanistan, Pakistan and Turkmenistan) . . . . . Tetramorium sulcinode

3
return to couplet #1
 * Frons extremely wide FR/CS 0.50 [0.49, 0.54] (Middle East) . . . . . Tetramorium syriacum


 * Frons narrower FR/CS < 0.41 . . . . . 4

4
return to couplet #3
 * Scape shorter, SL/CS = 0.75 . . . . . 5


 * Scape longer, SL/CS = 0.76 . . . . . 7

5
return to couplet #4
 * Dorsal surface of petiole steeply rounded backward, NOH/NOL 1.03 [0.94, 1.13] petiole relatively high, PEH/NOL 1.84 [1.68, 2.04]. Dorsum of petiolar node and postpetiole with very feeble concentric sinuous rugulae and reticulation, medially microreticulate. D(2b) 0.093 FR - 0.148 NOL - 2.941 = +2.647 [+1.069, +4.647] (NW Africa) . . . . . Tetramorium alternans


 * Petiolar node cubic in profile, NOH/NOL 0.84 [0.76, 0.97], petiole relatively low and long, PEH/NOL 1.50 [1.38, 1.73]. Dorsum of petiolar node and postpetiole coarsely rugoso-reticulate. D(2b) 0.093 FR - 0.148 NOL - 2.941 < +0.369 [-4.206, +0.369] . . . . . 6

6
return to couplet #5
 * Head dorsum and alitrunk coarsely rugoso-reticulate, ground surface coarsely microreticulate. Scape feebly costulate, first gastral tergite microreticulate. D(3b) 0.118 MW - 0.121 PEH - 0.084 PPH - 4.585 = +2.643 [-0.619, +4.595] (Asia Minor, Rhodes and Cyprus) . . . . . Tetramorium rhodium


 * Head dorsum and alitrunk feebly rugoso-reticulate, ground surface feebly microreticulate. Scape always smooth, first gastral tergite never microreticulate but well polygonally striate. D(3b) 0.118 MW - 0.121 PEH - 0.084 PPH - 4.585 = -2.643 [-4.022, -0.882] (Italy) . . . . . Tetramorium sanetrai

7
return to couplet #4
 * Base of scape with well visible dorsal carina, elongate ridge and costulae extending whole scape length (Central and East Europe, SE France and NW Italy, Caucasus, and Asia Minor) . . . . . Tetramorium moravicum


 * Base of scape without dorsal carina, surface not costulate, smooth and shiny at least basally . . . . . 8

8
return to couplet #7
 * Petiolar node cubic in profile, NOH/NOL 0.86 [0.76, 0.97], petiole relatively low and long, PEH/NOL 1.53 [1.37, 1.69] (Eastern part of South Europe to Kyrgyzstan) . . . . . Tetramorium chefketi


 * Petiolar node trapezoidal in profile, NOH/NOL = 0.96, petiole relatively high, PEH/NOL > 1.74 . . . . . 9

9
return to couplet #8
 * Dorsum of alitrunk rugoso-reticulate, ground surface microreticulate (fig. 39). Scape long, SL/CS 0.82 [0.82, 0.85], frons narrow, FR/CS 0.34 [0.33, 0.35], frontal lobes as wide as frons, FL/FR 1.0 [1.0, 1.02]. D(2a) 0.081 SL - 0.151 FL - 7.652 = +2.683 [+1.193, +3.493]. (Afghanistan) . . . . . Tetramorium exile


 * Dorsum of alitrunk with parallel rugulae, ground surface feebly microreticulate (fig. 22). Scape shorter, SL/CS 0.78 [0.76, 0.81], frons wider, FR/CS 0.37 [0.35, 0.39], frontal lobes wider, FL/FR 1.02 [1.0, 1.08]. D(2a) 0.081 SL - 0.151 FL - 7.652 = -2.683 [-4.682, -0.042]. (Anatolia, Turkey) . . . . . Tetramorium anatolicum