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| Natura: | Recurso digital |
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Zenodo
2011
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| Accesso online: | https://doi.org/10.5281/zenodo.5293948 |
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- <p><b><i>Iridomyrmex agilis</i> Forel</b></p><p>(Fig. 8)</p><p><i>Iridomyrmex agilis</i> Forel, 1907a: 295.</p><p><b>Types.</b> Syntypes from Yalgoo, Western Australia (ANIC, 1 worker (missing petiole and gaster), examined; MCZC, 1 worker (missing petiole and gaster), examined; MHNG, 2 workers (1 missing petiole and gaster); WAMP, 1 worker (missing petiole and gaster), examined).</p><p><b>Worker Description. <i>Head.</i></b> Posterior margin of head strongly convex; erect setae on posterior margin in fullface view set in a row; sides of head convergent anteriad; erect genal setae present on sides of head in full-face view, or 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 straight; antennal scape surpassing posterior margin of head by 0.2-0.5 x its length. Erect setae on scape absent, except at tip; 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. <i>Mesosoma.</i> Pronotum weakly undulant or almost straight. Erect pronotal setae numerous (12 or more), short and bristly. Mesonotum sinuous. Erect mesonotal setae moderate in number (6-12), short and bristly. Mesothoracic spiracles prominent or inconspicuous; propodeal dorsum smoothly and evenly convex; placement of propodeal spiracle posteriad and near propodeal declivity, or 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 moderate in number (6-12), short and bristly. <i>Petiole.</i> Dorsum of node convex, or planar; node thin, scale-like, orientation more-or-less vertical, or thick, orientation more-or-less vertical. <i>Gaster.</i> Non-marginal erect setae of gaster present on first gastral tergite; marginal erect setae of gaster present on first tergite, or absent on first tergite. <i>General characters.</i> Allometric differences between workers of same nest absent. Colour of foreparts variable, from light-yellow-orange to dark purple with iridescence ranging from very pale pink or yellowish to blue, legs brown with weak bluish iridescence, gaster dark brown. Colour of erect setae pale, whitish.</p><p><b>Measurements.</b> <i>Worker</i> (n = 5)—CI 78–81; EI 24–26; EL 0.31–0.34; EW 0.25–0.27; HFL 2.44–2.93; HL 1.56–1.70; HW 1.26–1.33; ML 2.11–2.31; MTL 1.72–2.20; PpH 0.22–0.25; PpL 0.79–0.86; SI 118–137; SL 1.55– 1.75.</p><p><b>Comments.</b> <i>Iridomyrmex agilis</i> can be distinguished from most other <i>Iridomyrmex</i> species by its elongate form, long head, which, in full-face view, is broader at and just above the eyes, and the distinctive, spur-like anteromedial clypeal prominence. Its near relative, <i>I. rubriceps</i>, can be separated from <i>I</i>. <i>agilis</i> by the contrasting colour of its head and pronotum compared with its mesonotum and propodeum (the former parts are of uniform colouration with the rest of the mesosoma in <i>I. agilis</i>). <i>Iridomyrmex bicknelli</i> is also similar, but has a slightly differently shaped head, and the hind femora are shorter in relation to the mesosoma. <i>Iridomyrmex agilis</i> is typically found in drier regions, where workers forage singly along well defined but indistinct paths across the ground, scurrying quickly with their gasters raised.</p>