Centromyrmex gigas

Identification
A member of the brachycola species group.

Key to Centromyrmex species

Distribution
Kempf reports this species from southeastern Brazil and adjacent areas of Argentina. This taxon was described from Brazil.

Nomenclature

 *  gigas. Centromyrmex gigas Forel, 1911c: 287 (w.) BRAZIL. Borgmeier, 1937b: 223 (q.). See also: Kempf, 1967b: 407.

Worker
Kempf (1967) - Total length about 12 mm. Head length 1.76-1.92 mm; head width 1.94-2.23 mm; thorax length 2.93-3.20 mm; hind tibia length 1.20-1.33 mm; hind metatarsus length 0.85-0.96 mm. Rather reddish brown than amber-colored, generally darker than Centromyrmex brachycola. Mandibles distinctly dentate at basal half, chewing border forming an obtuse angle with basal border. Head distinctly broader than long, sides more rounded, converging cephalad. Occiput gently concave. Clypeus without a median tumulus on disc. At posterior end of frontal sulcus often a rudimentary ocellus. Mesoepinotal suture either absent or indicated by a faint transverse notch. Mesopleura often divided by a transverse suture into anepisternum and catepisternum. Epinotum not so strongly constricted nor depressed as in brachycola; basal face often with a faint, saddle-shaped impression in the middle; declivous face less oblique than in brachycola. Metasternal angle more extensively striolate. Mesial spur of middle tibiae long and projecting beyond apex of tibia. Extensor face of hind tibiae with spine-like setae on apical half. Petiole as shown in Figs. 9 and 10; note the long subpetiolar process. Sternum I of gaster with a marginate tuberosity beneath petiolar insertion.