Strumigenys lygatrix

Identification
The only member of the Strumigenys lygatrix-group.

Distribution based on Regional Taxon Lists
Neotropical Region: Argentina.

Nomenclature

 *  lygatrix. Pyramica lygatrix Bolton, 2000: 204, figs. 141, 188 (w.) ARGENTINA. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 123

Worker
Holotype. TL 1.9, HL 0.44, HW 0.35, CI 80, ML 0.09, MI 20, SL 0.20, SI 57, PW 0.23, AL 0.50. Head in full-face view with dorsolateral margins diverging more or less evenly posteriorly, without convexly bulging lateral margins to the occipital lobes. Basal lamella of mandible shining. In profile cephalic dorsum evenly convex from front to back. Eye large and conspicuous, with 5 ommatidia in the longest row and about 20 ommatidia in total. Petiole node in dorsal view broader than long. Lateral spongiform lobe of postpetiole aliform and projecting laterally, in profile a longitudinal strip of postpetiolar cuticle visible between the lateral and ventral lobes throughout the length of the segment. Dorsolateral margins of head fringed with short, anteriorly curved simple hairs; those on the lateral margin s of the frontal lobes longer than those on the frontal carinae. A somewhat longer straighter apicoscrobal hair present but it is not strongly differentiated from the surrounding pilosity. Cephalic dorsum posteriorly with numerous short suberect simple hairs. Dorsal alitrunk, waist segments and first gastral tergite with numerous to abundant short simple hairs that are erect to suberect; without bizarre pilosity. Dorsal (outer) surface of hind tibia with short suberect to erect freely projecting simple hairs, the longest of them shorter than the maximum tibial width. Clypeus and most of cephalic dorsum unsculptured, smooth and shining except for minute hair-pits. Expanded frontal lobes and frontal carinae shagreenate-striolate dorsally; dorsum immediately behind the frontal carinae with a narrow band of longitudinal costulae on each side that extends posteriorly to the apex of the occipital lobe. Dorsal alitrunk mostly smooth, with scattered short longitudinal costulae; sides of alitrunk smooth. Petiole and postpetiole dorsally smooth and shining. Basigastral costulae short and weak, arising on each side of a smooth mediobasal clear area; gaster behind this unsculptured

Type Material
Holotype worker, Argentina: Salta, Chaco Occidental, Los Colorados, ca 50 km. NE Joaquin V. Gonzales, 4.iii.1992, HR 2-4 (B. Bestelmeyer).