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.)



References based on Global Ant Biodiversity Informatics

 * Ogata. K., Touyama, Y. and Choi, B. M. 1994. Ant fauna of Hiroshima Prefecture, Japan. ARI Reports of the Myrmecologists Society (Japan) 18: 18-25
 * Sato T., N. Tsurusaki, K. Hamaguchi, and K. Kinomura. 2010. Ant fauna of Tottori prefecture, Honshu, Japan. Bulletin of the Tottori Prefectural Museum 47: 27-44.
 * Tanaka H. O., T. F. Haraguchi, I. Tayasu, and F. Hyodo. 2019. Stable and radio-isotopic signatures reveal how the feeding habits of ants respond to natural secondary succession in a cool-temperate forest. Insectes Sociaux 66(1): 37-46.
 * Terayama M. 1992. Structure of ant communities in East Asia. A. Regional differences and species richness. Bulletin of the Bio-geographical Society of Japan 47: 1-31.
 * Terayama M., K. Ogata, and B.M. Choi. 1994. Distribution records of ants in 47 prefectures of Japan. Ari (report of the Myrmecologists Society of Japan) 18: 5-17.
 * Terayama M., and R. Sonobe. 2002. Ants from the Nasu Imperial Villa, Tochigi Prefecture, Japan. Flora and fauna of the Tochigi Prefectural Museum research report Nasu Imperial Villa 157-161.
 * Terayama M.; Onoyama, K. 1999. The ant genus Leptothorax Mayr (Hymenoptera: Formicidae) in Japan. Memoirs of the Myrmecological Society of Japan 1:71-97.
 * Teruyama. M. 1994. Ant fauna of Saitama Prefecture, Japan (Supplement). ARI Reports of the Myrmecologists Society (Japan) 18: 30
 * Yoshimura M. 2009. Impact of secondary forest management on ant assemblage composition in the temperate region in Japan. J. Insect. Conservation 13(5): 563-568.