曾名“叉颚叉细蚁（Furcotanilla furcomandibula）”，现并入原细蚁属。

图注： 工蚁（徐正会,2012）

Holotype(工蚁): TL 4.1, HL 0.77, HW 0.60, CI 78, SL 0.67, SI 111, PW 0.47, AL 1.17, ML 0.50, PNL 0.33, PNH 0.43, PNW 0.32, PPNL 0.40, PPNH 0.43, PPNW 0.30.

Head distinctly longer than broad, narrowed forward. In full face view, occipital margin straight, occipital corners rounded. Lateral sides of head evenly convex and with a tooth-like prominence at the antennal socket position, below the prominence with a deep notch. In dorsal view mandible long triangular, masticatory margin with 15 spine-like teeth. In lateral view mandible thick, lateroventral margin with 2 teeth, the basal one short and oblique, the apical one long and erect. Clypeus roughly triangular, anterior margin obviously concave in the center. Antenna with 12 segments, scape surpassed occipital corner by 1/5 of its length, segments 5-11 longer than broad, antennal club indistinct. In profile view, thorax distinctly constricted at mesothorax, pro no tum roundly convex, mesonotum straight. Promesonotal suture distinct, metanotal groove depressed. Dorsum of propodeum evenly convex, longer than declivity, posterodorsal corner rounded. In profile view petiolar node nearly rectangular, anterodorsal corner bluntly prominent, higher than posterodorsal corner, the latter rounded, anterior face vertical, posterior face sloped, dorsal face weakly convex. Subpetiolar process long and anteroventrally pointed, with a circular sub transparent fovea. Postpetiolar node weakly inclined forward, anterior face convex, dorsal face straight, anterodorsal corner rounded. Sternite of postpetiole deeply concave on the ventral face. In dorsal view petiolar node roughly square, width: length = 9: 8, anterior and posterior borders weakly convex, lateral borders evenly convex. Postpetiolar node trapezoid, narrowed forward and longer than broad, anterior and posterior faces roundly convex, lateral sides straight. In profile view, anterior margin of gaster with a narrow deep notch between tergite and sternite of the first segment. In dorsal view, anterior margin of gaster deeply concave, with anterolateral corners protruding and surrounded the postpetiole. Mandibles, head and the whole body smooth and shining. Head and body with sparse suberect hairs and dense decumbent pubescence. Scapes and tibiae with sparse subdecumbent hairs and dense decumbent pubescence. Body in color yellowish brown, legs brownish yellow.

Paratype: TL 4.0, HL 0.73, HW 0.57, CI 77, SL 0.67, SI 118, PW 0.43, AL 1.13, ML 0.47, PNL 0.33, PNH 0.43, PNW 0.30, PPNL 0.43, PPNH 0.43, PPNW 0.28 (1 individual measured). As holotype.

中国云南（昆明）。