Strumigenys ultromalyx

Known from litter-samples from wet forest habitats.

Identification
A member of the arnoldi complex in the Strumigenys arnoldi-group.

Distribution based on Regional Taxon Lists
Afrotropical Region: Cameroun, Gabon, Uganda.

Nomenclature

 *  ultromalyx. Strumigenys ultromalyx Bolton, 2000: 598 (w.) GABON.

Worker
Holotype. TL 2.4, HL 0.69, HW 0.60, CI 87, ML 0.26, MI 38, SL 0.34, SI 57, PW 0.32, AL 0.64. Characters of arnoldi-complex. Mandible short and stout, of approximately constant width from base to distal preapical tooth and through this length the outer margin about straight. In full-face view the inner ventral margin of the mandible, in the distal half of the mandible length, plainly visible, distinctly projecting farther mesially than the inner dorsal margin and crossed by the proximal preapical tooth. Proximal preapical tooth located distal of the mandibular midlength, stoutly conical and slightly recurved, much longer and stouter than the distal preapical tooth. Scape conspicuously flattened and distinctly expanded, its leading edge markedly convex. Cephalic dorsum with a transverse row of 4 remiform hairs close to the occipital margin, these hairs only slightly larger and slightly more elevated than the broad ground-pilosity; without standing hairs anterior to this row. Pronotal humeral hair absent; side of pronotum unsculptured. Pronotal dorsum longitudinally rugulose. Disc of postpetiole apparently unsculptured (all specimens with dense waxy bloom on disc). Hairs on first gastral tergite coarse and very stoutly remiform, some appearing almost clavate in dorsal view.

Paratypes. TL 2.2-2.4, HL 0.62-0.69, HW 0.54-0.61, CI 85-90, ML 0.25-0.26, MI 37-40, SL 0.30-0.34, SI 54-59, PW 0.28-0.32, AL 0.58-0.64 (10 measured).

Type Material
Holotype worker, Gabon: Provo Woleu-Ntem, 31.3 km. 108° ESE Minvoul, 2°04.8'N, 12°24.4'E, 600 m., 11.ii.1998, #1648(8) (B. L. Fisher).

Paratypes. 23 workers with same data as holotype but samples #1648 (5, 10, 12, 13, 14, 29, 33, and 34) (BMNH,, , , coll. Fisher).

References based on Global Ant Biodiversity Informatics

 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * Fisher B. L. 2004. Diversity patterns of ants (Hymenoptera: Formicidae) along an elevational gradient on Monts Doudou in southwestern Gabon. Memoirs of the California Academy of Sciences 28: 269-286.