Revision of the ant genus Iridomyrmex (Hymenoptera: Formicidae) 2845
Author
Heterick, Brian E.
Author
Shattuck, Steve
text
Zootaxa
2011
2011-04-29
2845
1
1
174
https://www.biotaxa.org/Zootaxa/article/view/zootaxa.2845.1.1
journal article
10.11646/zootaxa.2845.1.1
11755334
5287811
1FDB8D69-7200-4603-9677-930D01E813B5
Iridomyrmex spadius
Shattuck
(
Fig. 72
)
Iridomyrmex spadius
Shattuck, 1993a: 138
, figs 7, 17.
Types.
Holotype
worker from
Millstream National Park
, near
Ravenshoe
,
Queensland
(
ANIC
,
ANIC32-017915
, examined)
.
Paratypes
: same data as holotype (
ANIC
,
ANIC32-009157
,
6 workers
, examined;
ANIC
,
ANIC32- 009156
,
2 workers
, examined;
ANIC
,
ANIC32-009158
,
2 workers
, examined;
BMNH
,
3 workers
;
MCZC
,
3 workers
)
.
Worker Description.
Head.
Posterior margin of head weakly concave; erect setae on posterior margin in fullface 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 1.64–1.81.
Comments.
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. This is a localised species, known only from two disjunct populations in north-eastern and eastern
Queensland
, respectively. Ecological information is lacking.
Shattuck (1993a)
found that the male genitalia for this taxon were distinctive within the
I
.
purpureus
species-group.