Epopostruma sowestensis

The only known collection of this species was made using pitfall traps. The specimens came from Kojonup, in the southern wheatbelt (WA).

Identification
This species has expanded, wing-like lateral extensions of the postpetiole. It is similar to Epopostruma mercurii but differs in that E. sowestensis has the petiolar spines indistinct and reduced to sharp angles while in E. mercurii these spines are well developed and distinct. In addition, E. sowestensis has distinct flanges connecting the bases of the propodeal spines and propodeal lobes while E. mercurii lacks these flanges.

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 *  sowestensis. Epopostruma sowestensis Shattuck, in Bolton, 2000: 58 (w.) AUSTRALIA.

Description
In full face view the lateral margin of the head between the eye and the posterior corner generally angular. Pronotal spines present, short. Posterior section of metanotum in approximately the same plane as the dorsal face of propodeum, the junction of these plates either indistinct or in the form of a shallow trough or depression. Posterior face of propodeum with broad, distinct flanges which connect the bases of the spines to the propodeal lobes. Petiolar spines indistinct, reduced to sharp angles. Anterior face of postpetiole slightly longer than the dorsal face; sides of postpetiole expanded laterally in the form of thin, solid wings, their lateral margins flat; posterolateral margin of postpetiole (immediately anterior of gaster) weakly concave. Dorsum of petiole, postpetiole and gaster with straight or weakly curved erect hairs. First gastral tergite smooth. Body colour yellow-red; dorsal surface of head weakly infuscated; ventral regions of head, mandibles, antennae and legs slightly lighter; gaster uniform golden brown.

Measurements

Holotype worker. TL 4.1mm, HL 0.85mm, HW 0.82mm, CI 96, MandL 0.45mm, MandI 53, SL 0.53mm, SI 65, PronW 0.50mm, ML 1.02mm.