Odontomachus minangkabau

Identification
Species recognition. Odontomachus minangkabau is morphologically most similar to O. rixosus and O. pararixosus. However, it is distinguishable from the latter two by the following characteristics of the worker: large size: HL 3.13–3.55 mm, WL 4.15–4.65 mm (vs. small size: HL 2.40–3.03 mm, WL 3.35–4.00 mm in latter two); masticatory margin of mandible with 11–14 denticles (vs. less than 10 denticles in latter two); SI 153–161 (vs. SI 131–150 in latter two); median part of vertex along median furrow faintly striate transversely (vs. smooth and shiny or with rough texture in latter two); colors of head, mesosoma, petiole and gaster darker than in the latter two. Furthermore, Odontomachus minangkabau is easily distinguished from O. rixosus by the following characteristics of the male: first gastral tergum in lateral view long (vs. short in the latter); apical lobe of 9th abdominal sternum slightly narrowed in basal half, with apical margin weakly convex (vs. gently tapering to almost truncate apex in the latter); telomeral apex in lateral view much longer than high (vs. longer than high in the latter); ventral margin of valviceps with 28−29 denticles (vs. 21−22 denticles in the latter); head, pronotum, mesoscutum and mesopleuron pale yellowish (vs. yellowish to yellowish brown in the latter).

Distribution based on Regional Taxon Lists
Indo-Australian Region: Indonesia.

Nomenclature

 *  minangkabau. Odontomachus minangkabau Satria, et al. 2015: 28, figs. 14-18 (w.q.m.) INDONESIA (Sumatra).

Description
The specific epithet is named after the Minangkabau ethnic group indigenous to West Sumatra, Indonesia (type locality of this species).
 * Etymology.