Key to Tetramorium semilaeve complex workers

This worker key is based on: [[Media:Salata, S., Borowiec, L. 2017. Species of Tetramorium semilaeve complex from Balkans and Western Turkey.pdf|Salata, S. and L. Borowiec. 2017. Species of Tetramorium semilaeve complex from Balkans and western Turkey, with description of two new species of (Hymenoptera: Formicidae: Myrmicinae). Annales Zoologici (Warsaw). 62:279–313. (DOI:10.3161/00034541ANZ2017.67.2.008).]]

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Tetramorium

1

 * In nest sample all workers yellowish-brown to black . . . . . 2


 * In nest sample workers paler, yellow to pale yellowish-brown . . . . . 4

2
return to couplet #1
 * Occurrence limited to Maghreb . . . . . Tetramorium atlante


 * Eastern Mediterranean species . . . . . 3

3
return to couplet #2
 * Body colouration dark brown to black; propodeal spines large and placed closer to the top of mesosoma . . . . . Tetramorium hippocratis


 * Body colouration yellowish brown to brown; propodeal spines small and placed lower . . . . . Tetramorium kephalosi

4
return to couplet #1
 * Head striated on almost whole surface, also in postocular area, only between frontal rugose area and rugosities along ocular area on each side with small area of diffused rugosities . . . . . Tetramorium bellerophoni


 * Head sculpture partly reduced, at least with postocular area and sides of frons without distinct striation but with at least half of the surface of the anterior part of head striate . . . . . 5

5
return to couplet #4
 * Occipital margin of head straight or very shallowly concave; propodeal spines spiniform; Western Mediterranean species . . . . . Tetramorium semilaeve


 * Occipital margin of head always concave; propodeal spines triangular; Eastern Mediterranean species . . . . . Tetramorium galaticum