Dolichoderus australis

Dolichoderus australis is found in dry to wet forested areas of south-eastern Australia. Nests are in soil under rocks or occasionally in wood. Workers forage on the ground and on low vegetation and are timid, running for cover when disturbed. Its larvae were described by Wheeler and Wheeler (1974).

Identification
Sculpturing on head minimal, either essentially absent or consisting of very fine reticulations, reddish-brown to black in colour; pronotum and propodeum lacking spines; posterior face of propodeum with a shallow concavity, separated from the dorsal face by at most a weakly defined angle; first tergite of gaster with elongate erect hairs but lacking appressed pubescence.

This species most closely resembles Dolichoderus goudiei, however D. goudiei has appressed pubescence on the first tergite of the gaster which is lacking in this species.

Identification Keys including this Taxon

 * Key to Australian Dolichoderus Species

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

The records from Maria Island and Coles Bay, Tasmania, are likely introductions which occurred when the jail located in this area was active (B.B. Lowery, pers. comm.). This is based on the lack of additional material from Tasmania even though suitable habitats are abundant and widespread.

Nomenclature

 *  australis. Dolichoderus australis André, 1896b: 257 (w.) AUSTRALIA. Wheeler, G.C. & Wheeler, J. 1974b: 396 (l.). Combination in D. (Hypoclinea): Emery, 1913a: 12. See also: Clark, 1930b: 263.

Worker
Clark (1930) - Head and gaster black, thorax and node red, mandibles, antennae and legs brownish-red, brown on some examples.

Subopaque. Gaster smooth and shining. Head very finely and densely punctate, with some large, very shallow, scattered punctures. Mandibles smooth with a few scattered punctures. Pronotum almost smooth, microscopically reticulate. Mesonotum and epinotum more distinctly reticulate, with a few large shallow punctures. Node reticulate above.

Hair yellow, long and erect, abundant throughout, shorter and suberect on the antennae and legs. No pubescence apparent.

Head one-fourth longer than broad, as broad in front as behind, the occipital border and sides convex. Frontal carinae diverging behind, slightly longer than their distance apart. Clypeus convex above, with a longitudinal groove in the middle, more apparent in front than behind, anterior border convex, with a deep excision in the middle. Eyes large and rather flattened. Scapes extending beyond the occipital border by fully one-third of their length; first segment of the funiculus one-fourth longer than the second. Masticatory border of the mandibles feebly denticulate; the terminal border with eleven sharp teeth. Thorax twice as long as broad. Pronotum one-fourth broader than long, flattened above, on some examples it is feebly concave longitudinally. Mesonotum convex above. Epinotum as long as broad, strongly convex laterally, the posterior border convex; in profile strongly convex, higher in front than behind, not, or very slightly, overhanging the declivity, the latter concave, as long as the dorsum. Node three times broader than long, the anterior face feebly, the dorsum and posterior face strongly, convex; in profile scale-like, the anterior face straight, the posterior strongly convex. Gaster longer than broad, concave in front below. Legs robust.

Shattuck and Marsden (2013) - Sculpture on mesonotum and mesopleuron varying from very weakly developed and the surface shiny to moderately strong and the surface matte (the figured individual is intermediate between these extremes). Body colour variable, ranging from reddish to dark red-black. Head colour generally black, occasionally with a reddish tint.

Measurements (n=5). CI 77–84; EI 32–37; EL 0.28–0.33; HL 1.08–1.23; HW 0.85–1.01; ML 1.56–1.89; MTL 0.87–1.09; PronI 64.79–72.91; PronW 0.58–0.66; SI 132–140; SL 1.13–1.34.

Dolichoderus australis shows considerable variation in overall body colour, ranging from reddish to dark red-black. However, numerous intermediate forms between these extremes exist and no other characters could be found which suggest more than a single variable species is present. As such, this colour variation is here considered as being intraspecific.

References based on Global Ant Biodiversity Informatics

 * CSIRO Collection
 * Shattuck S. O., and S. Marsden. 2013. Australian species of the ant genus Dolichoderus (Hymenoptera: Formicidae). Zootaxa 3716(2): 101-143.