Key to Odontomachus workers of Sumatra

This worker key is based on: [[Media:Satria, R., Kurushima, H. et al. 2015. The trap-jaw ant genus Odontomachus from Sumatra.pdf|Satria, R., Kurushima, H., Herwina, H., Yamane, S. and Eguchi, K. 2015. The trap-jaw ant genus Odontomachus Latreille from Sumatra, with a new species description. Zootaxa. 4048:1-36.]]

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Odontomachus

1

 * Palp formula 4, 3; pronotal disc with long erect setae; mesopleuron with anteroventral ridge (arrow in Fig. 2C) . . . . . Odontomachus simillimus


 * Palp formula 4, 4; pronotal disc without long erect setae; mesopleuron without anteroventral ridge (arrow in Fig. 5C) . . . . . 2

2
return to couplet #1
 * Subapical tooth of mandible 2.5 times as long as broad (arrow in Fig. 11A) . . . . . 3


 * Subapical tooth of mandible as long as broad or shorter than broad (arrow in Fig. 5A) . . . . . 4

3
return to couplet #2
 * Size large (HL 3.13–3.55 mm; WL 4.15–4.65 mm); median part of vertex immediately along median furrow transversely striate; masticatory margin of mandible with more than 10 denticles; pronotal disc densely and transversely striate . . . . . Odontomachus minangkabau


 * Size small (HL 2.56–3.03 mm; WL 3.35–4.00 mm); median part of vertex immediately along median furrow smooth and shiny or sometimes with rough texture, but not transversely striate; masticatory margin of mandible with 10 or fewer denticles; pronotal disc usually concentrically striate (but rarely transversely striate) . . . . . Odontomachus rixosus

4
return to couplet #2
 * Masticatory margin of mandible with very small denticles or sometimes without denticles (only preapical angle is recognizable); propodeal dorsum anteriorly with a very weak median longitudinal depression; 1st gastral tergum with short erect setae; subpetiolar process in lateral view lobate and directed ventrally (Fig. 1A) . . . . . Odontomachus latidens


 * Masticatory margin of mandible with 6–9 distinct denticles which are reduced in size toward base of mandible; propodeal dorsum anteriorly without a median longitudinal depression; 1st gastral tergum without erect setae; subpetiolar process in lateral view triangular and directed posteriorly (Fig. 1B) . . . . . Odontomachus procerus