Strumigenys hiroshimensis

A rare species found of the forest floor of broadleaf forests and nesting in the soil (Ogata & Onoyama 1998).

Identification
A member of the Strumigenys circothrix-group.

Distribution based on Regional Taxon Lists
Oriental Region: Taiwan. Palaearctic Region: Japan.

Nomenclature

 *  hiroshimensis. Smithistruma hiroshimensis Ogata & Onoyama, 1998: 281, figs. 5, 6 (w.) JAPAN. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 121. See also: Bolton, 2000: 411.

Worker
Bolton (2000) - TL 2.0, HL 0.55, HW 0.41, CI 75, ML 0.13, MI 24, SL 0.28, SI 68, PW 0.25, AL 0.54. Extremely closely related to circothrix but differing as follows.

S. hiroshimensis: there is a single spoon-shaped hair on the leading edge of the scape (distal of the subbasal angle) that is curved toward the base of the scape; dorsum of the petiole node is without apically thickened to spatulate standing hairs; hairs on the first gastral tergite are simple; fully closed mandibles are as long as maximum length of clypeus; in dorsal view maximum width of lateral spongiform tissue on one side of postpetiole disc is broader than the dorsal width of the hind femur.

Strumigenys circothrix: has all hairs on the scape distal of the subbasal angle curved toward the apex of the scape; dorsum of the petiole node has 2 pairs of apically thickened to spatulate standing hairs; hairs on the first gastral tergite are apically thickened to clavate; fully closed mandibles are slightly shorter than maximum length of clypeus; in dorsal view maximum width of lateral spongiform tissue on one side of postpetiole disc is narrower than the dorsal width of the hind femur.

Type Material
Bolton (2000) - Holotype worker, JAPAN: Mt Futabayama, Hiroshima City, Hiroshima Pref., Honshu, 2.viii.1996 (Y. Touyama) (KU) [examined].