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Key to Eutetramorium species
This worker key is based on: Bolton, B. & Fisher, B.L. 2014. The Madagascan endemic myrmicine ants related to Eutetramorium (Hymenoptera: Formicidae): taxonomy of the genera Eutetramorium Emery, Malagidris nom. n., Myrmisaraka gen. n., Royidris gen. n., and Vitsika gen. n. Zootaxa 3791:1–99.
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- Much smaller, yellow species, HW 0.56–0.59, SL 0.44–0.48, MfL 0.52–0.54. Eye relatively larger, EL/HW 0.24–0.25. Palp formula 4,2. Metatibia without a spur . . . . . Eutetramorium parvum
- Much larger, darkly coloured species, HW > 1.00, SL > 0.75, MfL > 1.00. Eye relatively smaller, EL/HW 0.17–0.22. Palp formula 4,3. Metatibia with a stout simple spur . . . . . 2
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- Dorsum of promesonotum and first gastral tergite with numerous suberect to decumbent setae present. Propodeal spines short, in profile less than 1.50 × the maximum width of the propodeal lobe. Pronotal dorsum finely reticulate-rugose, the interspaces with some weak punctate ground sculpture . . . . . Eutetramorium monticellii
- Dorsum of promesonotum and first gastral tergite with minute appressed pubescence, without subdecumbent to decumbent setae. Propodeal spines long, in profile obviously more than 3.00 × longer than the maximum width of the propodeal lobe. Pronotal dorsum coarsely shagreenate between foveate pits . . . . . Eutetramorium mocquerysi
