Aphaenogaster barbara

This is a fairly common and widely distributed Queensland species which had previously been confused with A. pythia. However, it differs significantly from A. pythia and there is little chance of confusing these two species. Aphaenogaster barbara occurs in drier forested habitats such as dry sclerophyll and savannah woodlands. Nests are typical for the genus with large funnel-shaped entrances.



Holotype worker of A. barbara

Nomenclature
Aphaenogaster barbara Shattuck,S.O. (2008). Australian ants of the genus Aphaenogaster (Hymenoptera: Formicidae). Zootaxa. 1677 : 25–45 (p. 28).

Type Material
 * Holotype, 3km NE Mt. Webb, 15°03S 145°09E, Queensland (ANIC (Canberra): worker (32-031017)).
 * Paratype, 3km NE Mt. Webb, 15°03S 145°09E, Queensland (ANIC (Canberra): 27 workers (32-001260)).
 * Paratype, 3km NE Mt. Webb, 15°03S 145°09E, Queensland (MCZ (Cambridge): 3 workers).
 * Paratype, 3km NE Mt. Webb, 15°03S 145°09E, Queensland (QM (Brisbane): 3 workers).

Diagnosis
Hairs on underside of head randomly distributed and not forming a distinct psammophore; head relatively broad, its posterior margin broadly arched in full face view; scape relatively short; erect hairs on mesosomal dorsum tapering to sharp points; propodeal spines long, the dorsal surfaces of propodeum and propodeal spines connected through a gentle concavity followed by a gentle convexity (so that the base of each spine is raised slightly above the dorsal surface of the propodeum). This species can be separated from the similar A. kimberleyensis by the broader head and shorter scapes.

Description
Posterior margin of head broadly arched in full face view, the arch beginning at the occipital collar and with at most a weak angle separating the posterior and lateral margins of the head (often posterior and lateral margins forming a continuous surface). Hairs on venter of head randomly distributed and not forming a distinct psammophore. Mandibular sculpture composed of regularly sized striations. Erect hairs on mesosomal dorsum tapering to sharp points. Propodeal spines long. Dorsal surfaces of propodeum and propodeal spines connected through a gentle concavity followed by a gentle convexity (so that the base of each spine is raised slightly above the dorsal surface of the propodeum). Petiolar node (in dorsal view) longer than broad.

Measurements
Worker (n = 12, units = mm). CI 84-91; EI 17-20; EL 0.20-0.24; HL 1.22-1.5 1; HW 1.04-1.29; ML 1.82-2.17; MTL 1.23-1.62; SI 133-156; SL 1.55-1.82.


 * CI: Cephalic index: HW/HL x 100.
 * EI: Eye index: EL/HW x 100.
 * EL: Maximum eye length with eye in full face view.
 * HL: Maximum head length in full face (dorsal) view, measured from the anterior-most point of the clypeal margin to the posterior-most point of the head proper (excluding the occipital collar).
 * HW: Maximum head width in full face (dorsal) view excluding the eyes.
 * ML: Mesosomal length measured from the anterior surface of the pronotum proper (excluding the collar) to the posterior extension of the propodeal lobes.
 * MTL: Maximum length of mid tibia, excluding the proximal part of the articulation which is received into the distal end of the femur.
 * SI: Scape index: SL/HW x 100.
 * SL: Length of the scape (first antennal segment) excluding the basal neck and condyle.

Distribution
Australian National Insect Colection