Key to Aenictus minutulus group species

The following worker key is based on Jaitrong, W. & Hashimoto, Y. 2012. Revision of the Aenictus minutulus species group (Hymenoptera Formicidae Aenictinae) from Southeast Asia. Zootaxa 3426, 29-44. [[Media:Jaitrong & Hashimoto 2012.pdf|PDF]]

Key to Aenictus species groups

1

 * Promesonotum in profile with clearly convex dorsal outline; propodeum dorsally extremely lower than promesonotum (Figs 2C, 5C, 6C) . . . . . 2


 * Mesosoma dorsally almost flat or feebly convex (Figs 1C, 3C, 4C) . . . . . 4

2
return to couplet #1
 * Declivity of propodeum shallowly concave, encircled with a distinct rim (Fig. 2C–E) (Borneo and Java) . . . A. sp. 56 of WJT


 * Declivity of propodeum with lateral carinae, but not demarcated basally by a transverse carina (Figs 5D–E, 6B–D) . . . . . 3

3
return to couplet #2
 * In full-face view posterior margin of head convex; propodeal junction angulated, right-angled; larger species (TL 2.95–3.15mm; HW 0.52–0.58mm) (Vietnam and Myanmar) . . . . . Aenictus peguensis


 * In full-face view posterior margin of head almost straight or feebly concave; propodeal junction roundly angulated; smaller species (TL 2.10–2.15mm; HW 0.48–0.50mm) (Borneo) . . . . . Aenictus subterraneus

4
return to couplet #1
 * Basal margin of mandible with 1–2 small denticles next to large basal tooth and followed by a larger denticle; antennal scape relatively short (SI 63–64) (N. Vietnam) . . . . . Aenictus minimus


 * Basal margin of mandible with 3–5 denticles that gradually reduce in size toward base of mandible; antennal scape relatively long (SI 67–72) . . . . . 5

5
return to couplet #4
 * Metapleural gland bulla relatively large; distance between propodeal spiracle and metapleural gland bulla shorter than or almost as long as spiracular diameter (Fig.1D) (Vietnam and Thailand) . . . . . Aenictus changmaianus


 * Metapleural gland bulla relatively small; distance between propodeal spiracle and metapleural gland bulla clearly longer than spiracular diameter (Fig.4D) (Sumatra and Java) . . . . . Aenictus minutulus