Key to Tetramorium ferox species complex queens

This key to queens is based on: [[Media:Csosz 2010.pdf|Csösz, S. & Schulz, A. 2010. A taxonomic review of the Palaearctic Tetramorium ferox species-complex. Zootaxa. 2401:1-29. PDF]]

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1

 * First gastral tergite imbricate, (Fig. 20), appears dull; small species (CS 863±9 [857–870]) . . . . . Tetramorium aegeum


 * First gastral tergite smooth, appears shiny; size variable (CS 852–1095) . . . . . 2

2
return to couplet #1
 * Gastral tergites covered with very dense pubescence; large species (CS 1055±36 [1025–1095]) . . . . . Tetramorium densopilosum


 * First gastral tergite with pubescence very sparse; size variable (CS 852–1095) . . . . . 3

3
return to couplet #2
 * Ventral part of katepisternum rugulose to finer ruguloso-reticulate, between main sculpturation microreticulate; head, scutum and scutellum rugulose to rugose, between main sculpturation microreticulate; medium to large species (CS 1000±44 [955–1095]) . . . . . Tetramorium ferox


 * Ventral part of katepisternum smooth and shiny; head, scutum and scutellum variable, but more feebly sculptured, never microreticulate between the main sculpturation; small to medium species (CS 852–1012) . . . . . 4

4
return to couplet #3
 * Ventral surface of head with a row of short setae and long C-shape hairs arising just posteriorly to buccal cavity forming psammophore; small species (CS 893±32 [852–952]); dark brown to black . . . . . Tetramorium feroxoides


 * Ventral surface of head with a row of short setae only, without long C-shape hairs; medium sized species (CS 960±40 [860–1012]); yellow to light brown . . . . . Tetramorium diomedeum