Temnothorax congruus

This is an arboreal species, nesting in dead twigs of standing trees. Nuptial flights occur in mid July (Sonobe, 1980). The chromosome number is 2n = 18 (Imai & Kubota, 1972). It is common in Honshu, Shikoku, and Kyushu, but rare in Hokkaido.

Identification
Terayama and Onoyama (1999) - Total length of workers around 2.5-3 mm. Body color black to blackish brown. Scapes short, not reaching posterior margin of head. Dorsal outline of mesosoma almost straight in profile. Propodeum with short, triangular spines of variable size. Petiolar node triangular, its dorsal margin angulate in profile.

T. congruus is distinguished from other Japanese Temnothorax species by the black body, the short scapes, and the short propodeal spines.

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

Nomenclature

 *  congruus. Leptothorax congruus Smith, F. 1874: 406 (w.) JAPAN. Wheeler, W.M. 1906c: 317 (q.); Wheeler, G.C. & Wheeler, J. 1955b: 24 (l.); Imai & Kubota, 1972: 197 (k.). Combination in Temnothorax: Bolton, 2003: 271. See also: Terayama & Onoyama, 1999: 83.

Type Material
Terayama and Onoyama (1999) - Type Locality: Hiogo. [Holotype worker in examined.]