Key to Tetramorium chefketi species-complex queens

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]]

Queens of Tetramorium exile, Tetramorium rhodium, and Tetramorium syriacum are unknown.

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 * Tetramorium
 * 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 (in gynes this character is less distinct than in workers) . . . . . 2


 * Ventral surface of head with several short and a few straight, moderately long setae, psammophore absent . . . . . 3

2
return to couplet #1
 * Dorsum of petiolar node and postpetiole with sinuous rugae and coarse irregular reticulation. Petiolar node relatively low, NOH/NOL 1.38, PEH/NOL 2.56 . . . . . Tetramorium annectens


 * Dorsum of petiolar node usually with semi-circular rugulae, smooth medially, postpetiole longitudinally striate. Petiolar node relatively high, NOH/NOL 1.71 [1.52, 1.91], PEH/NOL 3.30 [3.12, 3.63] . . . . . Tetramorium sulcinode

3
return to couplet #1
 * Dorsal crest of petiolar node slightly convex with a well visible protuberance medially in frontal view (fig 43.). Scape basally with a well visible dorsal carina, elongated costulae sometimes extending whole scape surface (fig 45.). Head slightly narrower than scutum, MW/CS 1.07 [1.05, 1.13] . . . . . Tetramorium moravicum


 * Dorsal transversal crest of petiolar node straight, without protuberance medially (in frontal view). Scape basally without dorsal carina and without elongated costulae. Head wider than scutum, MW/CS < 1.0 . . . . . 4

4
return to couplet #3
 * Ventral part of katepisternum smooth and shiny. Petiolar node dorsum steeply rounded backward in profile . . . . . 5


 * Ventral part of katepisternum rugoso-reticulate and microreticulate. Petiolar node dorsum flattened in profile . . . . . 6