Key to Aenictus pachyerus group species

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The following worker key is based on Jaitrong, W. & Wiwatwitaya, D. 2013. Two new new species of the Aenictus pachycerus species group (Hymenoptera: Formicidae: Aenictinae) from Southeast Asia. Raffles Bulletin of Zoology 61, 97-102.

This key does not include Aenictus sirenicus, described in 2015.

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1

  • Head entirely smooth and shiny; dorsum of mesosoma entirely smooth and shiny . . . . . 2
  • Head entirely sculptured or partly smooth and shiny; dorsum of mesosoma entirely sculptured or partly smooth and shiny . . . . . 4

2

return to couplet #1

  • Promesonotum in profile with clearly convex dorsal outline; propodeum lower than promesonotum; body yellowish brown (Philippines) . . . . . Aenictus powersi
Aenictus powersi casent0217383 h 1 high.jpg
Aenictus powersi casent0217383 p 1 high.jpg
  • Mesosoma dorsally flat or feebly convex; body reddish brown . . . . . 3

3

return to couplet #2

  • Smaller species (HW 0.63–0.65 mm); propodeum in profile with feebly convex dorsal outline; longest pronotal hair 0.25–0.28 mm (Philippines) . . . . . Aenictus carolianus
  • Larger species (HW 0.75–0.78 mm); propodeum in profile with straight dorsal outline; longest pronotal hair ca. 0.15 mm (Philippines) . . . . . Aenictus reyesi

4

return to couplet #1

  • First gastral tergite superficially shagreened (Vietnam, Laos, and Thailand) . . . . . Aenictus paradentatus
Aenictus paradentatus casent0903682 h 1 high.jpg
Aenictus paradentatus casent0903682 p 1 high.jpg

5

return to couplet #4

  • Side of head partly smooth and shiny; dorsal face of pronotum partly shiny . . . . . 6
  • Side of head entirely sculpturate (punctate or reticulate); dorsal face of pronotum entirely sculptured and opaque . . . . . 7

6

return to couplet #5

  • Area just outside parafrontal ridge shagreened; vertex reticulate, with sparse standing hairs (less than 12); postpetiole almost as long as petiole (Sulawesi) . . . . . Aenictus sulawesiensis
  • Area just outside parafrontal ridge with several irregular longitudinal rugulae; vertex finely punctate; vertex with denser standing hairs (more than 15); petiole distinctly longer than petiole (Java) . . . . . undescribed species - A. sp. 84 of WJT

7

return to couplet #5

  • Propodeal junction in profile with protruding edge that is longer than maximum length of propodeal spiracle, very thin, acute, and far overhanging declivitous face; antennal scape longer (SI 143–152) (Malay Peninsula, Sumatra, Borneo and Java) . . . . . Aenictus dentatus
Aenictus dentatus casent0217375 h 1 high.jpg
Aenictus dentatus casent0217375 p 1 high.jpg
  • Edge of propodeal junction not longer than maximum spiracle width and not overhanging the declivitous face; antennal scape shorter (SI 110 or less than) . . . . . 8

8

return to couplet #7

  • Lateral face of pronotum partly smooth and shiny or superficially shagreened with smooth and shiny interspaces; area just outside parafrontal ridge with 3–5 irregular longitudinal rugulae (Borneo) . . . . . Aenictus kutai
  • Lateral face of pronotum entirely sculpturate and opaque; area just outside parafrontal ridge finely punctate . . . . . 9

9

return to couplet #8

  • Apical half of femora superficially reticulate with smooth and shiny bottoms; smaller species (TL 3.5–3.60 mm; HW 0.65–0.68 mm) (Philippines, Sulawesi and Australia) . . . . . Aenictus nesiotis
Aenictus nesiotis ANIC32-015770 head 63-Antwiki.jpg
Aenictus nesiotis ANIC32-015770 side 32-Antwiki.jpg
  • Entire femora finely punctate; larger species (TL 3.65–5.10 mm; HW 0.70–0.98 mm) . . . . . 10

10

return to couplet #9

  • Petiole sessile; subpetiolar process developed, triangular; ventral outline of postpetiole almost straight or weakly convex; larger species (TL 4.85–5.10 mm; HW 0.90–0.98 mm) (S. China and Vietnam) . . . . . Aenictus bobaiensis
  • Petiole subsessile; subpetiolar process low, its ventral outline convex; ventral outline of postpetiole feebly concave; smaller species (TL 3.65–4.20 mm; HW 0.70–0.80 mm) (Malay Peninsula, Borneo, and Buru Island) . . . . . Aenictus levior