Key to Tetramorium inquilinum species-group

Key to species of the Tetramorium inquilinum species-group (based on Salata et al. (2023), which is modified from Kiran et al. (2017)).

1

Carinae or teeth on dorsal surface of propodeum absent, dorsal profile of propodeum much shorter than the declivitous one. All lateral surfaces of mesosoma and petiole covered by a well-developed reticulate or alveolate microsculpture. Head length index CL/CW <0.945. Southern Balkans => Tetramorium buschingeri
Carinae or teeth on dorsal surface of propodeum present, dorsal profile of propodeum not much shorter than the declivitous one. Surfaces of lateral mesosoma and petiole only in patches covered by a reticulate or alveolate microsculpture or completely smooth. Head length index CL/CW >0.945 => 2

Dorsal surface of propodeum with indistinct carinae, teeth absent. Head surface smooth and shiny and katepisternum and anepisternum predominantly smooth and shiny. Greece => Tetramorium albenae
Dorsal surface of propodeum with blunt tooth. Head surface at least partially sculptured and/or katepisternum and anepisternum predominantly sculptured => 3

Scape long, SL/CS >1.00. Distance of frontal carinae clearly larger than petiolar width, DFC/PW >1.096. Size small, CW <464 µm. Scapes and tibiae with weaker, largely decumbent pilosity. Southern Iberia => Tetramorium kutteri
Scape shorter, SL/CS <1.00. Distance of frontal carinae not much larger than petiolar width, DFC/PW <1.096. Size larger, CW >464 µm. Scapes and tibiae with profuse erect or suberect pilosity => 4

Ratio of distance between lateral ocelli and large diameter of complex eye larger: DLO/EL 0.93–1.11. Katepisternum with many long decumbent hairs, posterior corners of head posterior of the eyes smooth, absolute scape length larger: SL >457 µm. Anatolia => Tetramorium seiferti
Ratio of distance between lateral ocelli and large diameter of complex eye smaller: DLO/EL 0.70–0.80. Katepisternum without or only with a few decumbent hairs, posterior corners of head posterior of the eyes densely microreticulate, absolute scape length smaller: SL <457 µm. Alps, Pyrenees and Cantabrian Mountains => Tetramorium inquilinum