Key to Temnothorax graecus species-group from Greece

Key to workers of the Temnothorax graecus species-group known from Greece (based on Salata et al., 2023).

1

 * Petiolar node very low to low and regularly rounded in profile, PEL/PEH ratio 1.53–1.58 (Figs 2, 15). Antennal club always partly brown
 * Petiolar node usually higher, subangulate in profile, its dorsum convex and acute or straight and sloping posteriorly, PEL/PEH ratio 1.40–1.55 (Figs 5, 6, 9, 12). Antennal club yellow or partly brown

2

 * Mesosoma, in lateral view, with dorsum slightly convex; medial frons and vertex predominantly smooth and with sparse and thin rugulae and indistinct costulae; mesosoma laterally with dense rugulae and indistinct costulae and smooth interspaces; dorsally with sparser and thicker rugocostulae (Figs 1–3) Temnothorax aeolius
 * Mesosoma, in lateral view, with dorsum straight; medial frons and vertex predominantly smooth and with sparse and thin costulae; pronotum with thick and sparse costulae with smooth interspaces, mesonotum and propodeum with denser and thinner rugocostulae (Figs 14–17) Temnothorax smyrnensis

3

 * Antennal club partly brown. Petiolar node with convex and acute dorsum (Figs 5, 6) Temnothorax graecus
 * Antennal club yellow (Figs 9, 12). Petiolar node with straight and sloping posteriorly dorsum

4

 * Femora yellow; medial frons and vertex shiny and with sparse to dense rugocostulae; propodeal spines short, in form of triangular denticles (Figs 11–13) Temnothorax phaetoni
 * Swollen part of femora bright brown to brown; medial frons and vertex with dense and thin costulae and only sometimes the central part of frons with slightly sparser sculpture; propodeal spines moderately long, in form of thin spines (Figs 8–10) Temnothorax mytilenes