This is a localised species, known only from two disjunct populations in north-eastern and eastern Queensland, respectively. Ecological information is lacking.
Iridomyrmex spadius belongs to the I. purpureus complex, but can be distinguished from other members of the complex by its light yellow-red head, contrasting with the darker mesosoma. Shattuck (1993a) found that the male genitalia for this taxon were distinctive within the I. purpureus species-group.
Keys including this Species
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- spadius. Iridomyrmex spadius Shattuck, 1993a: 138, figs. 7, 17 (w.) AUSTRALIA. See also: Heterick & Shattuck, 2011: 138.
- Holotype, worker, Millstream National Park, near Ravenshoe, Queensland, Australia, Lowery,B.B., ANIC32-017915, Australian National Insect Collection.
- Paratype, 2 workers, Millstream National Park, near Ravenshoe, Queensland, Australia, Lowery,B.B., ANIC32-009156, Australian National Insect Collection.
- Paratype, 6 workers, Millstream National Park, near Ravenshoe, Queensland, Australia, Lowery,B.B., ANIC32-009157, Australian National Insect Collection.
- Paratype, 2 workers, Millstream National Park, near Ravenshoe, Queensland, Australia, Lowery,B.B., ANIC32-009158, Australian National Insect Collection.
- Paratype, workers, Millstream National Park, near Ravenshoe, Queensland, Australia, The Natural History Museum.
- Paratype, workers, Millstream National Park, near Ravenshoe, Queensland, Australia, Museum of Comparative Zoology.
Worker Description. Head. Posterior margin of head weakly concave; erect setae on posterior margin in full- face view set in a row; sides of head noticeably convex; erect genal setae absent from sides of head in full-face view (one to a few small setae may be present near mandibular insertion). Ocelli absent; in full-face view, eyes set at about midpoint of head capsule; in profile, eye set anteriad of head capsule; eye semi-circular. Frontal carinae convex; antennal scape surpassing posterior margin of head by approximately 3 x its diameter. Erect setae on scape present and abundant; prominence on anteromedial clypeal margin projecting as triangular spur; mandible elongate triangular with oblique basal margin; long, curved setae on venter of head capsule absent. Mesosoma. Pronotum moderately and evenly curved over its length. Erect pronotal setae numerous (12 or more), short and bristly. Mesonotum sinuous. Erect mesonotal setae numerous (12 or more), short and bristly. Mesothoracic spiracles always prominent as small, vertical protuberances; propodeal dorsum protuberant; placement of propodeal spiracle mesad, more than its diameter away from propodeal declivity; propodeal angle weakly present or absent, the confluence of the dorsal and declivitous propodeal faces indicated, if at all, by an undulation. Erect propodeal setae numerous (12 or more), short and bristly. Petiole. Dorsum of node acuminate; node thin, scale-like, orientation more-or-less vertical. Gaster. Non-marginal erect setae of gaster present on first gastral tergite; marginal erect setae of gaster present on first tergite. General characters. Allometric differences between workers of same nest absent. Colour head orange with weak green iridescence, mesosoma and legs brown (mesosoma with pink iridescence), gaster chocolate with bluish iridescence. Colour of erect setae brown.
Measurements. Worker (n = 13)—CI 89–95; EI 18–21; EL 0.34–0.38; EW 0.20–0.23; HL 1.83–2.11; HW 1.66–1.99; ML 0.89–1.07; PpH 0.25–0.33; PpL 0.95–1.10; SI 91–105; SL 1.64–1.8 1.
- Heterick, B.E. & Shattuck, S.O. 2011. Revision of the ant genus Iridomyrmex (Hymenoptera: Formicidae). Zootaxa 2845: 1-175. PDF
- Shattuck, S. O. 1993a. Revision of the Iridomyrmex purpureus species-group (Hymenoptera: Formicidae). Invertebr. Taxon. 7: 113-149 (page 138, figs. 7, 17 worker described)