Strumigenys trixodens

Identification
The only member of the Strumigenys trixodens-group.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Borneo, Indonesia, Malaysia.

Nomenclature

 *  trixodens. Strumigenys trixodens Bolton, 2000: 909, figs. 480, 515 (w.) BORNEO.

Worker
Holotype. TL 2.9, HL 0.77, HW 0.59, CI 77, ML 0.43, MI 56, SL 0.48, SI 81, PW 0.30, AL 0.76. Hairs on leading edge of scape coarsely spatulate, suberect to almost erect and curved; longest of them subequal to maximum width of scape. Ground pilosity of head of numerous slightly elevated curved spatulate hairs. Occipital margin with a transverse row of erect longer stouter hairs, but cephalic dorsum anterior to this row without standing hairs. Pronotal dorsum with slightly elevated ground-pilosity but without erect stout hairs. Mesonotum with 4 pairs of erect stoutly remiform hairs; the anterior two pairs longer than the posterior two and the second pair the longest. Long remiform hairs present on petiole and postpetiole, these contrasting strongly with the fine flagellate hairs of the first gastral tergite. Petiole node in dorsal view about as long as broad. Disc of postpetiole only slightly broader than petiole, not markedly transverse. Postpetiole disc mostly smooth, with punctate sculpture around the periphery (variable, see under paratypes). Longest basigastral costulae about equal to length of postpetiole disc.

Paratypes. TL 2.9-3.1, HL 0.77-0.82, HW 0.58-0.62, CI 73-77, ML 0.43-0.46, MI 53-56, SL 0.47-0.50, SI 80-83, PW 0.30-0.33, AL 0.75-0.80 (5 measured). As holotype but sculpture on disc of postpetiole increasing in area with increased body size. In the largest non-paratypic individuals the disc is almost entirely reticulate-punctate.

The non-paratypic material contains individuals that are slightly smaller to slightly larger than the type-series but are otherwise identical. Dimensions of non-paratypic workers. HL 0.76-0.92, HW 0.55-0.73, CI 72-77, ML 0.40-0.50, MI 53-54, SL 0.47-0.55, SI 77-85.

Type Material
Holotype worker, Malaysia: Sarawak, 4th Division, Gn. Mulu N.P., 830 m., v-viii. 1978, BM 1978-49 (P. M. Hammond & J. E. Marshall). Paratypes. 5 workers with same data as holotype (BMNH, ).