Key to Aenictus minutulus group species

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The following worker key is based on Jaitrong & Hashimoto (2012) as modified by Wong & Guénard (2016)

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1

  • Promesonotum in profile with clearly convex dorsal outline; propodeum dorsally extremely lower than promesonotum . . . . . 2
  • Mesosoma dorsally almost flat or feebly convex . . . . . 4

2

return to couplet #1

  • Declivity of propodeum shallowly concave, encircled with a distinct rim (Borneo and Java) . . . A. sp. 56 of WJT
  • Declivity of propodeum with lateral carinae, but not demarcated basally by a transverse carina . . . . . 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
Aenictus peguensis casent0281968 h 1 high.jpg
Aenictus peguensis casent0281968 p 1 high.jpg
  • 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

  • Head square-shaped and almost as wide as long (CI 91–96); antennal scape relatively short (SI 61–64); polymorphic worker caste with largest individuals exceeding 3.10 mm in TL (Singapore) . . . . . . . Aenictus seletarius
  • Head longer than wide (CI < 90); antennal scape relatively long (SI 67–72); relatively smaller species (TL < 2.60 mm) . . . . . 6

6

return to couplet #5

  • Metapleural gland bulla relatively large; distance between propodeal spiracle and metapleural gland bulla shorter than or almost as long as spiracular diameter (Vietnam and Thailand) . . . . . Aenictus changmaianus
Aenictus changmaianus head (www.niaes.affrc.go.jp).jpg
Aenictus changmaianus side (www.niaes.affrc.go.jp).jpg
  • Metapleural gland bulla relatively small; distance between propodeal spiracle and metapleural gland bulla clearly longer than spiracular diameter (Sumatra and Java) . . . . . Aenictus minutulus

References