Key to Odontomachus workers of Sumatra

This worker key is based on: 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

Satria et al. 2015. Figure 2. Odontomachus simillimus

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

Satria et al. 2015. Figure 5.

2

return to couplet #1

• Subapical tooth of mandible 2.5 times as long as broad (arrow in Fig. 11A) . . . . . 3

Satria et al. 2015. Figure 11.

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

Satria et al. 2015. Figure 5.

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

Satria et al. 2015. 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

Satria et al. 2015. 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

Satria et al. 2015. Figure 1.

Satria et al. 2015. 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

Satria et al. 2015. Odontomachus procerus