Japanese Name
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Iso-ashinaga-ari
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Original Reference
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Teranishi, C. (1940) Works of Cho Teranishi. Memorial Volume: 312 pp. plus posthumous section of 95 pp. Osaka.
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Synonym
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Aphaenogaster famelica var. osimensis Teranishi (Teranishi, 1940) ,
Aphaenogaster lepida? Okamoto (Okamoto, 1966) ,
Aphaenogaster osimensis Imai (Imai, 1971) ,
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Description
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Total length of workers around 4 - 6 mm. Head and gaster dark brown to reddish brown; mesosoma, petiole and postpetiole light brown; legs brown. Scapes relatively rather short compared to other Japanese Aphaenogaster species. Clypeus with transverse striae on its anterior portion. Basal margin of mandibles weakly serrate. Posterior part of head and dorsal part of pronotum smooth and shining, lacking sculpture. Mesonotum not distinctly raised, and with poorly developed striation and punctures. Propodeum and sides of metanotum shining, with little sculpturation.
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Remarks
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A. osimensis generally nests in the soil, crevices in rocks, or under stones in open rocky seashore habitats. On small islands the range of occupied habitats is extended to include forests and their margins, or inland rocky areas. Foraging workers turn their gasters downwards. Chromosome number 2n = 32 (from Manazuru, Kanagawa Prefecture: Imai, 1969).
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Distribution
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Honshu (Ibaragi Pref. and southwards), Izu Is, Ogasawara Is, Shikoku, Kyushu and its southern islands, Nansei Is (Amami-oshima I. and northwards).
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