Yunodorylus sexspinus

Cerapachys sexspinus constructs nest in the soil and forage in soil or under litter. A nest including 385 individuals was observed in a soil sample of seasonal rain forest. Another nest containing 20 individuals was found in a soil sample of deciduous monsoon forest. Other individuals were also collected in soil of mountain rain forest and warm deciduous broad-leaf forest. (Xu 2000)

Distribution
China: Yunnan Province (Mengla County, Menghai County, Jinghong County). Altitude: 730-1,280m.

Distribution based on Regional Taxon Lists
Oriental Region: Thailand. Palaearctic Region: China.

Nomenclature

 *  sexspinus. Yunodorylus sexspinus Xu, 2000b: 298, figs. 1-6 (w.) CHINA. Combination in Cerapachys: Bolton, 2003: 269. See also: Borowiec, 2009: 53.

Worker
Holotype worker: TL 3.4, HL 0.77, HW 0.70, CI 91, SL 0.37, SI 52, PW 0.50, AL 0.93, ML 0.40, PL 0.27, PH 0.40, DPW 0.37, LPI 150, DPI 138. Head nearly square, slightly longer than broad, narrowered anteriorly. In full face view, occiput shallowly depressed, occipital corners roundly prominent, lateral sides evenly convex. Anterior portion of gena convex. Mandibles elongate triangular, the large apical tooth followed by a smaller preapical tooth and 4 minute denticles. Clypeus reduced and only visible on lateral sides. Frontal lobes suberect and reached to anterior margin of head. Antennae with 12 segments, apex of scape reached to 7/15 of the distance from antennal socket to occipital corner, flagellum distinctly incrassate towards apex. Eyes and ocelli absent. In profile view, dorsum of alitrunk straight and flat, very slightly convex, posterodorsal corner of propodeum rounded. In dorsal view, alitrunk roughly rectangular, lateral sides weakly impressed at midlength. In profile view petiolar node roughly rectangular, very thick, anterior face straight, dorsal and posterior faces roundly convex, anterodorsal angle blunt, posterodorsal angle indistinct. Subpetiolar process large, roughly rectangular, posteroventrally pointed. In dorsal view petiolar node broader than long, width: length = 11: 8, anterior face straight, posterior face and lateral sides roundly convex. Dorsum of pygidium slightly depressed, lateroposterior margins with 6 minute peg-like spines on each side. Sting extruding. Mandibles, head, and alitrunk with sparse large punctures, interspace smooth and shining, distance between punctures larger than or equal to diameter of a puncture. Sides of alitrunk and petiolar node with sparse fine punctures, interspace granulate, less shining. Gaster with punctures from which setae arising, interspace smooth. Dorsum of the whole body with a few suberect hairs and dense decumbent pubescences. Antennal scapes and tibiae of legs with a few suberect hairs and dense decumbent pubescences. Body in color yellowish brown, mandibles and antennae dark reddish brown, legs brownish yellow.

Paratype workers: TL 2.3-3.6, HL 0.53-0.77, HW 0.43-0.73, CI 79-91, SL 0.27- 0.40, SI 50-62, PW 0.30 – 0.53, AL 0.67 – 1.00, ML 0.27-0.43, PL 0.20-0.30, PH 0.23-0.43, DPW 0.22-0.40, LPI 117-150, DPI 108-138 (10 measured). As holotype, but body varying in size, color brownish yellow to dark reddish brown.

Type Material
Holotype: worker, No. A97- 2064, 730 m, Bubang Village, Mengla County, Yunnan Province, from a colony constructs nest in soil in seasonal rain forest, 1997-VIII-17 (ZENG Guang). Paratypes: 34 workers, from the same colony as the holotype and with same data as holotype; 18 workers, No.A98- 775, 1,040 m, Longlin Village, Mengla County, Yunnan Province, from a soil sample in deciduous monsoon forest, 1998-III-14 (ZENG Guang). The type specimens are deposited in the Insect Collection, Faculty of Resources, Southwest Forestry College, Kunming, Yunnan Province, P1 R1 China.