Discothyrea crassicornis

Known from two hand collected workers taken from under a log in the Darling Range, and a pitfall-trapped worker from Dwellingup.

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 *  crassicornis. Discothyrea crassicornis Clark, 1926: 46, pl. 6, fig. 4 (w.) AUSTRALIA. See also: Brown, 1958g: 340.

Worker
Worker: Length 1.8mm.

Rufo testaceous; mandibles, apical joints of the antennae and legs yellow. Hairs whitish, short and sparse on the whole body. Pubescence whitish, short, very fine and abundant everywhere, longest on the gaster.

Opaque. Densely and finely punctate-reticulate on the head, more coarsely so on the thorax and abdomen, node coarsely punctate above.

Head longer than broad, broader behind than in front, the occipital border and sides convex, the posterior angles rounded. Frontal carinae short and erect, dilated behind, truncate behind the dilation and confluent to the middle of the head. Clypeus produced, widely convex in front, feebly but distinctly crenulate. Mandibles moderately long, subtriangular, the terminal border with a sharp cutting edge which shows no traces of teeth, ending in a somewhat long sharp point. Eyes small, flattened, placed slightly in front of the middle of the sides. No traces of ocelli. Antennae 9-jointed, short and very thick; scapes short, extending to about the occipital third of the head, club-shaped, fully three times thicker at the apex than at the base; first joint of the funiculus as broad as long, cylindrical, five times longer than the second, the second to seventh much broader than long, subequal, the seventh fully three times broader than the second, the apical joint very large, about two and one half times longer than broad, and much longer than the remainder of the funiculus. Thorax fully twice as long as broad at the pronotum; one and one half times broader through the pronotum than through the epinotum; pronotum convex in front and on the sides, feebly concave in the mesonotal region; there are no traces of mesonotal sutures; the posterior margin of the epinotum slightly concave and marginate, the angles bluntly produced; in profile rounded and convex above, the epinotal declivity abrupt, almost at a right angle with the dorsum, the sides marginate. Node, from above, two and one half times broader than long, all four sides of the dorsum convex; in profile it is twice as high as long, rounded above, the anterior face almost straight, the ventral surface in front with a short blunt tooth-like projection, to the front edge of which is attached a keel-like, translucent lamella. Postpetiole slightly broader than long, much broader behind than in front, the anterior border and sides rounded; in profile it is convex and rounded above, the ventral surface with a transverse, tooth-like process in front. A strong constriction between the two segments of the gaster. The second segment is one fourth broader than long, broader in front than behind, strongly rounded and convex, narrowing rapidly to the small apical segments which are placed below. Legs short and stout.

References based on Global Ant Biodiversity Informatics

 * Heterick B. E. 2009. A guide to the ants of south-western Australia. Records of the Western Australian Museum Supplement 76: 1-206.
 * Taylor R. W., and D. R. Brown. 1985. Formicoidea. Zoological Catalogue of Australia 2: 1-149.