Key to Leptogenys modiglianii species group workers

This worker key is based on: [[Media:Arimoto, K. 2017. Taxonomy of the Leptogenys modiglianii species group from southeast Asia.pdf|Arimoto, K. 2017. Taxonomy of the Leptogenys modiglianii species group from southeast Asia (Hymenoptera, Formicidae, Ponerinae). ZooKeys 651: 79–106 (doi:10.3897/zookeys.651.10366).]]

All of the species in this group occur in southeast Asia.

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Leptogenys

1

 * In profile, petiole longer than or almost as long as high (LPI: 94–102); dorsal face of node subhorizontal (Fig. 16A) . . . . . Leptogenys breviloba


 * In profile, petiole higher than long (LPI: 103–122); dorsal face of node distinctly sloping anteriad (Fig. 16B) . . . . . 2

2
return to couplet #1
 * In full-face view, head shorter (CI: 88–101). Mandible curved near base, becoming straight apically. Clypeus with lateral lobe (Fig. 17A) . . . . . 3


 * In full-face view, head longer (CI: 77–83). Mandible distinctly curved throughout. Clypeus without lateral lobe (Fig. 17B) . . . . . 5

3
return to couplet #2
 * In full-face view, head almost as long as wide (CI: 98–101). Antennal scape distinctly long (SL: 1.83–1.95; SI: 115–121), surpassing posterior margin of head by two-fifths of its length. Median clypeal extension with truncate apex (Fig. 18A) . . . . . Leptogenys malayana


 * In full-face view, head longer than wide (CI: 88–95). Antennal scape long (SL: 1.40–1.80; SI: 99–110), surpassing posterior margin of head by one-fifth to one-third of its length. Median clypeal extension with convex apex (Fig. 18B,C) . . . . . 4

4
return to couplet #3
 * In full-face view, head slightly longer than wide (CI: 93–95). Clypeus with blunt angle between lateral lobe and median extension. In profile, petiole distinctly higher than long (LPI: 109–118); in profile, anterior face of node ventrally vertical and dorsally forming continuous curve with dorsum . . . . . Leptogenys itoi
 * In full-face view, head distinctly longer than wide (CI: 88–90). Clypeus smoothly incurved between lateral lobe and median extension. In profile, petiole slightly higher than long (LPI: 103–108); in profile node with anterior and dorsal faces forming continuous curve . . . . . Leptogenys modiglianii

5
return to couplet #2
 * In profile, petiolar node with anterior and dorsal faces forming continuous curve. Gastral segment II covered with scalloped depressions, which close to each other. Body covered with understory layer of short dense hairs (Fig. 19A) . . . . . . Leptogenys curva
 * In profile, anterior face of petiolar node ventrally vertical and dorsally forming continuous curve with dorsum. Gastral segment II smooth. Short hairs not forming understory layer (Fig. 19B) . . . . . . Leptogenys kanaoi