Iridomyrmex hartmeyeri

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Iridomyrmex hartmeyeri
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Iridomyrmex
Species: I. hartmeyeri
Binomial name
Iridomyrmex hartmeyeri
Forel, 1907

Iridomyrmex hartmeyeri side view

Iridomyrmex hartmeyeri top view

Like close relatives, this ant is largely nocturnal. It has a generally very broad distribution over much of the Australian continent, but avoids the wetter southwest and south-east corners.

Identification

Iridomyrmex hartmeyeri is a pale yellowish to dull orange ant, with large, asymmetrical compound eyes. The workers can be of a reasonable size, their proportions approaching those of a small meat ant in some populations. The large size, indented posterior margin of the head, glabrous hind tibia and glabrous or near glabrous mesosomal dorsum set this species aside from similar ants.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • hartmeyeri. Iridomyrmex hartmeyeri Forel, 1907h: 296 (w.) AUSTRALIA. See also: Heterick & Shattuck, 2011: 87.

Type Material

Description

Worker Description. Head. Posterior margin of head weakly concave, or strongly concave; erect setae on posterior margin absent; 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 above midpoint of head capsule; in profile, eye set anteriad of head capsule; eye asymmetrical, curvature of inner eye margin more pronounced than its outer margin and anterior sector of eye distinctly broader than its posterior sector. Frontal carinae straight; antennal scape surpassing posterior margin of head by approximately 3 x its diameter. Erect setae on scape absent, except at tip; prominence on anteromedial clypeal margin projecting as blunt but distinct protuberance; mandible elongate triangular with oblique basal margin; long, curved setae on venter of head capsule absent. Mesosoma. Pronotum strongly inclined anteriorly. Erect pronotal setae lacking or very minute (one or two tiny setae may be present). Mesonotum sinuous, or straight. Erect mesonotal setae lacking or very minute (one or two tiny setae present). Mesothoracic spiracles always inconspicuous; propodeal dorsum protuberant, or smoothly and evenly convex; 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 lacking or very minute (one or two tiny setae present). Petiole. Dorsum of node convex; node thin, scale-like, orientation more-or-less vertical. Gaster. Non-marginal erect setae of gaster present or absent on first gastral tergite; marginal erect setae of gaster present on first tergite, or absent on first tergite. General characters. Allometric differences between workers of same nest present. Colour of foreparts uniformly pale yellow to medium ochre, gaster brown in darker specimens. Colour of erect setae where present, pale yellowish.

Measurements. Worker (n = 10)—CI 88–93; EI 32–38; EL 0.28–0.40; EW 0.21–0.29; HFL 1.07–2.00; HL 0.88–1.33; HW 0.78–1.20; ML 1.15–2.00; MTL 0.77–1.44; PpH 0.17–0.30; PpL 0.44–0.75; SI 106–126; SL 0.86– 1.43.

References