Perissomyrmex fissus

The type material was collected from a ground sample in the primary sub-alpine moist evergreen broadleaf forest.

Identification
Xu & Wang (2004) - This new species is close to Perissomyrmex monticola, but central notch of clypeus quite deep, its depth about 2/5 of clypeus length. Anterolateral border of clypeus with 2 denticles. In profile view, mesonotum angularly prominent at posterior 1/3. Dorsum of propodeum straight. Gaster black.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  fissus. Perissomyrmex fissus Xu & Wang, 2004: 218, figs. (w.) CHINA.

Worker
Holotype worker. TL 3.1, HL 0.83, HW 0.80, CI 97, SL 0.73, SI 91, EL 0.10, PW 0.50, AL 0.88, PL 0.33, PH 0.26, DPW 0.15, PPL 0.23, PPH 0.28, PPW 0.21, PI 46, PPI 94. Head nearly square, about as broad as long, widened forward. In full face view, occipital margin slightly concave, occipital corners rounded, lateral sides weakly convex. Mandible rectangular, inner margin with one tooth in the middle, masticatory margin with 3 teeth and a diastema, arranged as apical tooth, preapical tooth, diastema and basal tooth. Central notch of anterior margin of clypeus deep and U-shaped, its depth about 2/5 of clypeus length. Lateral sides of the central notch formed a pair of acute teeth. Anterolateral border of clypeus with two denticles. Frontal carinae absent, antennal sockets completely exposed. Antenna 9-segmented, scape surpassed occipital corner by 1/5 of its length, antennal club consisted of 3 apical segments. Eyes relatively smaller and prominent outside the lateral sides of head, with 6 ommatidia along the maximum diameter. In profile view, pronotum weakly convex. Promesonotal suture absent. Mesonotum sloped backward and angularly prominent at posterior 1/3. Metanotal groove depressed. Propodeal spines strong and acute, dorsum of propodeum straight. Propodeal lobes small and angularly prominent at apices. In profile view, petiole without subpetiolar process. Petiolar node relatively high and thin, weakly narrowed upward, dorsum moderately convex, anterodorsal corner higher than posterodorsal corner. Anteroventral corner of postpetiole rightly angled, postpetiolar node inclined posteriorly, as high as petiolar node.

Apical 1/4 of mandible smooth and shining, basal 3/4 finely longitudinally striate. Clypeus smooth and shining. Head and alitrunk sparsely coarsely and longitudinally striate. Lateral sides of mesothorax, metathorax and propodeum smooth and shining, with very sparse longitudinal striations. Dorsum of propodeum smooth. Lower portions of petiole and postpetiole finely reticulate, petiolar node and postpetiolar node smooth and shining. Gaster smooth and shining. Dorsal surfaces of head and body with abundant erect or suberect long hairs and subdecumbent short hairs. Scapes and tibiae with abundant subdecumbent long hairs and decumbent short hairs. Head, mandibles, antennae and alitrunk brown. Legs, petiole and postpetiole yellowish brown. Gaster black, anterior face and apex blackish brown.

Type Material
Holotype: worker, No. A2826, 2500 m, Ailao Mountain Nature Reserve, Jinshan Pass, Gasa Town, Xinping County, Yunnan Province, 15-Ⅲ-2003, collected by Mr. Xu Zheng-hui in a ground sample in the primary sub-alpine moist evergreen broadleaf forest. The type specimen is deposited in the Insect Collection, Southwest Forestry College, Kunming, Yunnan Province, P. R. China.

References based on Global Ant Biodiversity Informatics

 * Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Xu Z. H., and W. H. Wang. 2004. The third species of the ant genus Perissomyrmex Smith (Hymenoptera: Formicidae) in the world. Entomotaxonomia 26: 217-221.
 * Xu Z. and W.-H. Wang. 2004. The third species of the ant genus Perissomyrmex Smith (Hymenoptera: Formicidae) in the world. Entomotaxonomia 26(3): 217-221