Strumigenys didyma

The type material was collected from a riverine forest litter sample.

Identification
Bolton (2000) - A member of the arnoldi complex in the Strumigenys arnoldi-group. Unique in the Afrotropical arnoldi-group because of its sculptured pleurae; in all other species of the group these sclerites are mostly to entirely smooth.

Distribution based on Regional Taxon Lists
Afrotropical Region: United Republic of Tanzania.

Nomenclature

 *  didyma. Strumigenys didyma Bolton, 2000: 592 (w.) TANZANIA.

Worker
Holotype. TL 2.2, HL 0.61, HW 0.43, CI 70, ML 0.21, MI 34, SL 0.34, SI 79, PW 0.27, AL 0.60. Characters of arnoldi-complex. Mandible gradually increasing in width from proximal preapical tooth to base; outer margin shallowly convex and obviously inflected near base. Left proximal preapical tooth broken off short in holotype; left distal preapical tooth not reduced to a denticle, about same size as right distal. Distal preapical tooth on right mandible about half the length of the spiniform proximal. Scape weakly flattened, broadest at about the midlength; its leading edge moderately convex but not strongly expanded. Cephalic dorsum with a transverse row of 4 remiform standing hairs close to occipital margin, and with a similar pair close to highest point of vertex. Pronotal humeral hair flagellate; side of pronotum with sculpture present. Mesopleuron, metapleuron and side of propodeum finely reticulate or reticulate-shagreenate to superficially reticulate-punctate, smooth only near propodeal spiracle. Disc of postpetiole superficially reticulate-punctate. Dorsum of first gastral tergite with fine superficial sculpture from apices of basigastral costulae to apex of sclerite. Hairs on first gastral tergite stoutly remiform.

Type Material
Holotype worker, Tanzania: above Kisiwani on Nakombo River, 4°09'35"S, 37°56'29"E, 29.xi.1995, Winkler bag extraction ex litter in riverine forest, SAM-HYM-C009833 (H. G. Robertson).