Odontomachus simillimus
Not considered a significant pest species.
Diagnosis of worker among Antkey species. Antenna 12-segmented. Clypeus with anterior margin flat to convex, but never forming a distinct triangle that projects anteriorly beyond the base of the mandibles. Posterior margin of head interrupted by median groove. Eyes medium to large (greater than 6 facets); situated distinctly below midline of head. Frontal lobes present. Mandibles linear; armed with apical fork; inserted towards the middle of the anterior head margin. Hind coxae lacking dorsal spine Waist 1-segmented. Petiole narrowly attached to gaster with conspicuous posterior face; upright and not appearing flattened; armed with apical spine. Gaster armed with sting; abdominal segment 4 lacking deep longitudinal furrows; distinct constriction between abdominal segments 3+4 or not visible between abdominal segments 3+4. Color brown to black, often with paler coxae and appendages.
Odontomachus is readily distinguished from most other genera with introduced or commonly intercepted species by its distinctive head shape and linear mandibles armed with an apical fork. Odontomachus can be easily confused with the generally smaller Anochetus, but can be separated by median groove that interrupts the posterior margin of the head. The only other introduced or commonly intercepted ponerine with long linear mandibles is Leptogenys falcigera, from which Odontomachus species can be separated by the mandibles which are inserted into the clypeus medially (versus laterally) and are armed with an apical fork, and also by the prominent apical spine on the petiole. Additional study is required to distinguish O. ruginodis from O. simillimus. The general sculpture, color, pilosity, head shape, petiole shape and even the metasternal process (Brown [1976]) are very similar. At this point the only way to distinguish them is by their respective ranges.
Odontomachus ruginodis