Epopostruma inornata

This rare species is currently known from a single specimen. It belongs to the quadrispinosa species group and is one of only two members of this group to occur west of the Adelaide region (the other being Epopostruma quadrispinosa).

Identification
Epopostruma inornata can be separated from other species in this genus by having the following combination of characters:
 * Lateral margin of the head between the eye and the posterior corner forming a gentle convexity.
 * Humeral angles of pronotum rounded, lacking spines.
 * Dorsum of petiole lacking elongate spines.
 * Anterior face of postpetiole shorter than the dorsal and posterior faces.
 * Sides of postpetiole approximately vertical and rounding gradually from dorsal to posterior surfaces.
 * In dorsal view the postpetiole lacking lateral teeth.

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 *  inornata. Epopostruma inornata Shattuck, 2007: 48, figs. 1-4 (w.) AUSTRALIA.



Description
In full face view lateral margin of head between eye and posterior corner forming a gentle convexity. Pronotal spines absent, anterolateral corners of pronotum very slightly angular. Posterior section of metanotum in approximately same plane as dorsal face of propodeum, junction of these plates indistinct. Posterior face of propodeum between bases of spines and propodeal lobes with thin flanges. Petiolar spines reduced to a small protuberance or angle. Anterior face of postpetiole shorter than dorsal face and separated from it by a broadly rounded angle; lateral surface of postpetiole approximately vertical and rounding gradually from dorsal to posterior surfaces, in dorsal view lateral margins parallel. Dorsum of petiole, postpetiole and gaster with short, appressed hairs. First gastral tergite smooth. Body colour yellowish brown, dorsum of head and gaster slightly darker, mandibles and legs lighter.

Measurements

Holotype worker. TL 2.8mm, HL 0.67mm, HW 0.57mm, CI 85, MandL 0.30mm, MandI 45, SL 0.33mm, SI 58, PronW 0.41mm, ML 0.75mm.