Key to Tetramorium chefketi species-complex workers

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This worker key is based on: 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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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
Csosz et al. 2007. FIGURES 3–10. Various types of microreticulation, Fig. 3 and 4. long setae forming a psammophore of Tetramorium sulcinode worker, Fig. 5. very short setae posterior to buccal cavity of T. rhodium worker, Fig. 6. microreticulation of the fronto-lateral surface of head of T. rhodium worker, Fig. 7. microreticulation of the basal part of the 1st gaster tergite of Tetramorium syriacum worker, Fig. 8. polygonal striation of the 1st gaster tergite of T. chefketi worker, Figs. 9–10. Male genitalia of T. sulcinode, Fig. 9. profile, Fig. 10. caudal view.

2

return to couplet #1

Csosz et al. 2007. FIGURES 25–31. Tetramorium annectens Pisarski, 1969. Gyne: alitrunk petiole and postpetiole, Fig. 25. dorsal view, Fig. 26. lateral view, Fig. 27. head. Worker: Fig. 28. head. Alitrunk petiole and postpetiole, Fig. 29. dorsal view, Fig. 30. lateral view, Fig. 31. scape, dorsal view.
  • 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
Tetramorium sulcinode casent0235354 h 1 high.jpg
Tetramorium sulcinode casent0235354 p 1 high.jpg

3

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Tetramorium syriacum casent0263996 h 1 high.jpg
Tetramorium syriacum casent0263996 p 1 high.jpg

4

return to couplet #3

5

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  • 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
Tetramorium alternans H casent0904815.jpg
Tetramorium alternans P casent0904815.jpg
  • 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

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  • 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
Tetramorium rhodium casent0904812 h 1 high.jpg
Tetramorium rhodium casent0904812 p 1 high.jpg
  • 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
Tetramorium sanetrai casent0905852 h 1 high.jpg
Tetramorium sanetrai casent0905852 p 1 high.jpg

7

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  • 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
Tetramorium moravicum casent0281564 h 1 high.jpg
Tetramorium moravicum casent0281564 p 1 high.jpg
  • 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
Tetramorium chefketi casent0281565 h 1 high.jpg
Tetramorium chefketi casent0281565 p 1 high.jpg
  • 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
Csosz et al. 2007. FIGURES 39–42. Tetramorium exile Csosz & Radchenko New species. Worker: alitrunk petiole and postpetiole, Fig. 39. dorsal view, Fig. 40. lateral view, Fig. 41. Head, Fig. 42. scape, dorsal view.
  • 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
Tetramorium anatolicum casent0281566 h 1 high.jpg
Tetramorium anatolicum casent0281566 p 1 high.jpg