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species
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Lasius sakagamii
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Japanese Name
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Kawara-ke-ari
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Original Reference
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Yamauchi, K. & Hayashida, K. (1970) Taxonomic studies on the genus Lasius in Hokkaido, with ethological and ecological notes. 2. The subgenus Lasius. Journal of the Faculty of Science, Hokkaido University Series 6, Zoology 17: 501-519.
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Description
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Total length of workers around 2.5 - 3.5 mm. Color brown. Scapes as long as the head is wide, and with more than 30 erect hairs. Anterior tibiae with many erect hairs. Petiole thick and low, anterior margin with a weak, blunt angle in lateral view.
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Remarks
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This species nests in the soil in dry environments such as grasslands at riversides or seashores. Nests are polygynous and polycalic, and multiply by budding. The number of contained individuals is large, sometimes reaching several hundred thousand (Yamauchi, 1981; Yamauchi et al., 1981, 1982). The nuptial-flight period is relatively long for a species of subgenus Lasius with records from June to October. Collections of L. sakagamii from Okinawa (Naha City) probably represent an introduction by human commerce. Diploid males are known to occur in this species (Yamauchi et al., 2001).
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Distribution
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Hokkaido, Honshu, Kyushu, Yaku I.; Korean Peninsula.
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References
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- Yamauchi, K. (1981). Taxonomy and ecology of the ant genus Lasius of Japan. . Nature and Insects, 16(3), 9-14.
- Yamauchi, K., K. Kinomura & S. Miyake (1981). Sociobiological studies of the polygynic ant Lasius sakagamii. II. Production of colony members. . Ins. Soc., 29, 164-174.
- Yamauchi et al (1982)
- Taxonomic studies on the genus Lasius in Hokkaido, with ethological and ecological notes. 2. The subgenus Lasius. Journal of the Faculty of Science, Hokkaido University Series 6, Zoology 17: 501-519.
- Yamauchi, K., T. Yoshida, T. Ogawa, S. Jimbo & H. T. Imai (2001). Spermatogenesis of diploid males in the formicine ant, Lasius sakagamii. Insectes Soc. 48: 28-32.
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Editor
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Original text by Mamoru Terayama and Katsusuke Yamauchi. English translation by Mamoru Terayama, edited by Robert W. Taylor.
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