Perissomyrmex guizhouensis

The types were collected from forest litter.

Identification
Zhou & Huang (2006) - Differs from Perissomyrmex fissus by anterolateral clypeal border each with 1 tooth beside the central teeth, antennal scape shorter, SI = 85 (the latter = 91), mandibles coarsely longitudinally striate. It differs from Perissomyrmex snyderi by central notch of anterior clypeal border deep and U-shaped, sculptures on pronotum longitudinal, color reddish brown. It differs from Perissomyrmex monticola by the central pair teeth of the anterior clypeal border slightly larger than the two external teeth, petiole 2 times longer than broad, pronotum longitudinally striate.

The major workers are not larger than the minor worker, but the head has distinct ocelli and very different shape.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 * . Perissomyrmex guizhouensis Zhou & Huang, 2006: 191, figs. 1–3 (w.) CHINA (Guizhou).
 * Type-material: holotype worker, 5 paratype workers.
 * Type-locality: holotype Guizhou Prov., Fanjing Mt Natural Reserve (1980 m.), 27°49’N, 108°45’E, 31.v.2002 (S. Zhou); paratypes with same data.
 * Type-depositories: GNUC (holotype); ANIC, GNUC, KUIC, LACM (paratypes).
 * Status as species: Guénard & Dunn, 2012: 49; Xu & Zhang, 2012: 148 (in key).
 * Distribution: China.

Worker
Holotype, minor worker. TL 3.9, HL 0.98, HW 0.98, SL 0.86, EL 0.10, AL 1.05, PW 0.56, PL 0.34, PNW 0.17, PH 0.27, PPL 0.27, PPW 0.23, PPH 0.29, CI 100, SI 87, PI 50, PPI 85. Head as broad as long, widened forward. In full face view, occipital margin weakly convex, occipital corners rounded, sides slightly 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. Median region of clypeus flattened, anterior clypeal border with 4 teeth: the central pair slightly larger than the two external teeth. Frontal carinae absent leaving antennal sockets completely exposed. Antenna 9-segmented, apical three enlarged to form antennal club. Antennal scape surpassing occipital corner by 1/6 of its length. Eyes protuberant but small, placed at the middle length of the sides of the head. In profile view, pronotum slightly convex, promesonotal suture absent. Propodeal impression well developed. Propodeal spines divergent, directed backwards, dorsum of propodeum slightly convex. Petiole 2 times longer than broad, without subpetiolar process. Petiolar node relatively high and thin, weakly narrowed upwards, dorsum moderately convex, anterodorsal corner higher than posterodorsal corner. Anteroventral corner of postpetiole right-angled, postpetiolar node inclined posteriorly, as high as petiolar node.

Mandible coarsely longitudinally striate. Clypeus smooth and shining. Head and alitrunk sparsely longitudinally striate. Lateral sides of mesothorax, metathorax smooth and shining, propodeum sparsely longitudinally striate. Petiole and postpetiole sparsely longitudinally striate. Gaster smooth and shining. Dorsal surfaces of head and body with abundant erect or suberect long hairs and subdecumbent short hairs. Antennal scapes and tibiae with abundant subdecumbent long hairs and decumbent short hairs. Color reddish brown, antennal scapes and legs lighter, gaster darker.

Major worker: TL 3.9, HL 1.00, HW 1.00, SL 0.78, EL 0.12, AL 1.06, PW 0.56, PL 0.34, PNW 0.17, PH 0.27, PPL 0.27, PPW 0.23, PPH 0.29, CI 100, SI 78, PI 50, PPI 85 (two specimens measured, the measurements are the same). Head slightly larger than that of minor, with distinct ocelli, eyes larger than that of minor, occipital margin distinctly broadly concave, antennal scapes shorter than that of minor, anterior clypeal border without notch, its center prominent and lateral with two indistinct blunt teeth. Other characters are as those of minor. Paratype workers: TL 3.9-4.0, HL 0.95-100, HW 0.95-100, SL 0.78-0.86, EL 0.10-0.12, AL 1.03-1.06, PW 0.54-0.56, PL 0.32-0.34, PNW 0.16-0.17, PH 0.26-0.27, PPL 0.27-0.29, PPW 0.22-0.23, PPH 0.27-0.29, CI 98-100, SI 78-87, PI 50-54, PPI 81-85 (2 major and 4 minor measured).

Type Material
Holotype minor worker, Fanjing Mountain Natural Reserve (1980 m), Guizhou Province, 27 49'N, 108 45'W, 31 May 2002, Shanyi Zhou leg. Paratype 2 major workers, 3 minor workers, data as holotype. All the types were collected in primeval forest floor leaf litter sample. The holotype is deposited in the Insect Collection, Guangxi Normal University, Guilin, P. R. China. The paratypes of P. guizhouensis will be deposited in Natural History Museum of Los Angeles Country, California (U.S.A.), CSIRO Division of Entomology, Canberra (Australia), and in the Faculty of Science, Kagoshima University (Kagoshima, Japan).