Euponera pilosior

Identification
Total body length of workers about 4.5 - 5 mm. Color dark reddish brown to blackish brown; antennae, mandibles and legs reddish brown. Head almost square in frontal view, slightly longer than wide. Mandibles each with a basal pit. Eyes small, each with about 10 facets. Subpetiolar process trapezoidal, with sub-angulate antero-ventral and posteroventral corners.

Distribution based on Regional Taxon Lists
Palaearctic Region: China, Democratic Peoples Republic of Korea, Japan, Republic of Korea.

Japan (Honshu, Shikoku, Kyushu, Tsushima I., Nansei Is (Okinawa I. and northwards)); Korean Peninsula.

Biology
This species  is  relatively  rare. It inhabits forest leaf-litter.

Nomenclature

 *  pilosior. Euponera (Trachymesopus) sharpi subsp. pilosior Wheeler, W.M. 1928d: 98 (w.) JAPAN. Ogata, 1987: 114 (q.m.). Combination in Trachymesopus: Brown, 1963: 8; in Pachycondyla: Brown, in Bolton, 1995b: 308. Raised to species and senior synonym of chosonensis: Brown, 1963: 8.
 * chosonensis. Euponera (Trachymesopus) chosonensis Teranishi, 1940: 8 (w.) KOREA. Junior synonym of pilosior: Brown, 1963: 8.

Additional References

 * Schmidt, C.A. & Shattuck, S.O. 2014. The higher classification of the ant subfamily Ponerinae (Hymenoptera: Formicidae), with a review of ponerine ecology and behavior. Zootaxa. 3817, 1–242 (doi:10.11646/zootaxa.3817.1.1)