Temnothorax arimensis

T. arimensis ranges from lowlands to mountainous areas, to about 1,000 m above sea level. It nests in soil or dead twigs. Relatively rare. (Terayama and Onoyama 1999)

Identification
Terayama and Onoyama (1999) - A small ant: total length of workers around 2 mm. Body color yellow to yellowish brown from mesosoma to gaster, head brown. Scapes long, slightly exceeding posterior margin of head. Dorsal outline of mesosoma gently and simply convex, almost without interruption in the metanotal section (propodeal dorsum almost straight in some individuals). Metanotal groove not incised or very shallowly incised dorsally. Propodeal teeth relatively short, slightly longer than their basal width. Petiolar node triangular, with slightly concave anterior slope in profile. Subpetiolar process very small or obscure.

Distribution
Hokkaido, Honshu.

Distribution based on Regional Taxon Lists
Palaearctic Region: Japan.

Nomenclature

 *  arimensis. Leptothorax (Leptothorax) arimensis Azuma, 1953: 3 (w.) JAPAN. Azuma, 1977: 114 (q.). Combination in Temnothorax: Bolton, 2003: 271. See also: Onoyama, 1980: 194, 212; Terayama & Onoyama, 1999: 80.

Type Material
Terayama and Onoyama (1999) - Worker, female. Type locality: Arima-onsen Shrine, Arima, Hyogo Pref. (several workers, 2. VI. 1947, M. Azuma leg.)