Stictoponera pertusa Lattke, 2004

Gusti, M., Jannatan, R., Putri, I. L. E & Satria, R., 2024, First record of ant Stictoponera pertusa Lattke, 2004 (Hymenoptera: Formicidae, Ectatomminae) in Sumatra Island, with description of the hitherto unknown dealate queen, Far Eastern Entomologist 497, pp. 15-20 : 17

Stictoponera pertusa Lattke, 2004

Figs 1 , 2

Gnamptogenys pertusa Lattke, 2004: 209 (worker; type locality: Sabah, Borneo, Malaysia) .

Stictoponera pertusa : Camacho et al. 2022: 12.

MATERIAL EXAMINED. Indonesia: West Sumatra, Padang, Pauh, Limau Manis, Sarasah Uwak Waterfall, 0°54'47.7"S, 100°28'54.8"E, 6.II 2021, ca. 380 m asl., 2 workers (individual code: SEMUT 10iv22A; SEMUT 10iv22B), leg. R. Satria; same locality, 2.III 2021, colony code: SU-2iii23A, 1 queen (individual code: SEMUT2 iii23A), 2 workers (individual code: SEMUT2 iii23B, SEMUT2 iii23C), leg. R. Satria .

DIAGNOSIS. The head in frontal view with base of mandible is swollen; clypeal lamella translucent, with broadly convex anterior margin. The petiole in lateral view with propodeal declivity sharply defined laterally by low crests; subpetiolar process subquadrate with sharp posterior angle in lateral view.

MEASUREMENTS of dealate queen (n= 1). HL 0.88 mm, HW 0.63 mm, ED 0, 2 mm, SL= 0.53 mm, ML 0.27 mm, WL 1.31 mm, CI 0.71, SI 0.84, MI 0.17, OI 0.31.

DESCRIPTION OF DEALATE QUEEN (hitherto unknown). In general, appearance queen is similar to worker, for worker description see Lattke (2004). Head with subparallel sides in dorsal view; foveolae on frons with intervening spaces broad or broader than average diameter of foveolae; clypeus with anteromedian smooth to undulated area, laterally with longitudinal strigulae, lamella translucent with background lighting, anterior margin convex; mandible with convex bulging base; dorsally rugulose-punctate, apically mostly smooth; very small, broadly separated denticles present on chewing border; head with evenly convex occipital lamella in lateral view; posterodorsal mandibular margin with brief, mostly straight margin, then with pronounced convexity in lateral view.

Pronotum laterally foveolate along dorsal half, mostly smooth on ventral half, strigulae present along posterior edge; anepisternum rhomboid, smooth with some punctae; katepisternum mostly smooth, with shallow strigulae along anterodorsal corner; metapleuron and propodeum mostly smooth, longitudinal strigulae present along ventral area of metapleuron; propodeum foveolate, propodeal declivity sharply defined laterally by low crests. Dorsum of mesosoma and petiole sparsely foveolate, mostly smooth especially along longitudinal median strip; petiole with ventral process anteriorly convex in lateral view, ending in a posterior angle; postpetiole laterally with close and deep foveolae anterad, posteriorly becoming shallow and sparse; postpetiolar dorsum mostly smooth with sparse, shallow, piligerous punctae; fore coxa transversely strigulose along posterior half, smooth anterad. Dorsum of thorax and abdominal segments 1–4 with scattered erect to subdecumbent hairs. Body dark brown; legs, antennae, and mandibles ferruginous brown.

The head in frontal view; the mandible shorter and with little or almost no hair, more deep sculpture in the head than workers, cephalic dorsum is wrinkled and narrow. The petiole in lateral view; propodeal without declivity sharply but curved, head and alitrunk swollen.

REMARKS. The species Stictoponera pertusa is recorded on Sumatra Island for the first time. We collected this species from the leaf-litter in the lowland disturbed forest at altitude ca. 380 m. The holotype that described by Lattke in 2004 was also collected from the lowland area in Sandakan, Sabah, Malaysia (Borneo) at an altitude ca. 10 m. So far, we assume this species inhabits in lowland forests .

DISTRIBUTION. Indonesia: Sumatra (new record); Malaysia: Sabah.

Figures

Fig. 1. Gnamtogenys pertusa Lattke, 2004: A, B – worker (individual code: SEMUT10iv22A); C, D – dealate queen (colony code: SU-2iii23A, individual code: SEMUT2iii23A); A, C – head in frontal view; B, D – profile in lateral view.