Key to Aenictus of India

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This worker key is based on: Bharti, H.; Wachkoo, A. A.; Kumar, R. 2012. Two remarkable new species of Aenictus (Hymenoptera: Formicidae) from India. Journal of Asia-Pacific Entomology 15:291-294 PDF

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Aenictus

1

  • Mandibles narrow, 3- or 4-toothed, and in closed position their inner borders are often (but not always) separated from the anterior clypeal border by a large gap . . . . . 2
  • Mandibles broad and triangular; bearing a distinct apical tooth and a preapical tooth, followed by at least 4 or 5 smaller teeth or denticles, the posteriormost of which are much smaller than the apical tooth; mandibular gap lacking . . . . . 5

2

return to couplet #1

  • Anterior clypeal border entire and convex and bearing approximately 6 small but distinct teeth; a small (HW, 0.51–0.53 mm), shining, very hairy brownish yellow species with very short scapes (SI, 66–69) . . . . . Aenictus brevicornis
Aenictus brevicornis casent0281955 p 1 high.jpg
  • Anterior clypeal border lacking teeth, and emarginate . . . . . 3

3

return to couplet #2

  • Scapes very short (SI, 58–61); junction of propodeal faces an even convex curve . . . . . 4
  • Scapes longer (SI of at least 70); junction of propodeal faces angulate . . . . . Aenictus ceylonicus
Aenictus-ceylonicusL6.3x.jpg

4

return to couplet #3

  • Clypeus strongly emarginate; mandibles thick, strongly curved inward; at closure the inner mandibular borders are separated from the anterior clypeal border by a gap as wide as the maximum width of the scape . . . . . Aenictus doryloides
  • Clypeus straight or slightly convex; mandibles neither conspicuously thickened or curved inward; in closure the inner mandibular borders either reach the anterior clypeal border or are separated from it by a gap much narrower than in doryloides . . . . . Aenictus piercei
Aenictus piercei casent0281961 p 1 high.jpg

5

return to couplet #1

  • “Typhlatta spots” present; these are a pair of large, pale, circular areas covering most of the posterolateral portions of the head and contrasting sharply with the much darker remainder of the head . . . . . 6

6

return to couplet #5

  • Subpetiolar process absent or at most very low and rounded . . . . . Aenictus gracilis
Aenictus gracilis casent0217376 p 1 high.jpg

7

return to couplet #6

  • Seen from the side, the propodeal faces join through a smooth curve . . . . . Aenictus laeviceps
Aenictus laeviceps casent0217377 p 1 high.jpg
  • Seen from the side, the propodeal faces join in a sharp angle . . . . . 8

8

return to couplet #7

  • Pronotal dorsum microreticulate and opaque; a somewhat larger species, HW, 0.79–0.92 mm . . . . . Aenictus binghami
Aenictus binghami casent0217371 p 1 high.jpg
Aenictus fergusoni casent0281962 p 1 high.jpg

9

return to couplet #5

  • Subpetiolar process either absent or else merely a low, evenly round lobe . . . . . 11

10

return to couplet #9

  • Whole mesosoma opaque and sculuptured, mandibles with 5 indistinct denticles . . . . . Aenictus shillongensis
  • Pronotum shining, remainder of mesosoma and petiole microreticulate; mandibles with more than 5 denticles . . . . . Aenictus peguensis
Aenictus peguensis casent0281968 p 1 high.jpg

11

return to couplet #9

  • Mesonotum demarcated from mesopleuron by a conspicuous ridge . . . . . 12
  • Mesonotum not visibly demarcated from mesopleuron . . . . . 13

12

return to couplet #11

  • Reddish brown; head width 0.84 mm; metanotal impression present; parafrontal ridge about 0.22mm long . . . . . Aenictus indicus
Aenictus indicus antweb1008019 h 1 high.jpg
Aenictus indicus antweb1008019 p 1 high.jpg
  • Blackish; head width 0.7–0.74 mm; metanotal impression absent; parafrontal ridge about 0.27 mm long . . . . . Aenictus wilsoni
Aenictus wilsoni antweb1008020 h 1 high.jpg
Aenictus wilsoni antweb1008020 p 1 high.jpg

13

return to couplet #11

  • Anterior clypeal border dentate; small species, HW 0.43-0.53 mm; scapes long, scape index at least 102 and usually much more . . . . . 14
  • Anterior clypeal border not dentate; larger species, HW at least 0.57 mm; scapes shorter, scape index not exceeding 102 and usually much less . . . . . 15

14

return to couplet #13

Aenictus wroughtonii casent0907022 h 1 high.jpg
Aenictus wroughtonii casent0907022 p 1 high.jpg
  • Head width 0.46–0.53 mm; scape index 102–108 . . . . . Aenictus sagei
Aenictus sagei casent0281958 h 1 high.jpg
Aenictus sagei casent0281958 p 1 high.jpg

15

return to couplet #13

  • Occiput constricted behind into narrow but distinct “collar”; propodeal angle (junction of basal and declivitous faces) longer in profile than maximum length of propodeal spiracle, very thin acute, and far overhanging the declivitous face; a large species (HW, 0.78–0.81 mm) with long (SI about 137) . . . . . Aenictus dentatus
Aenictus dentatus casent0217375 h 1 high.jpg
Aenictus dentatus casent0217375 p 1 high.jpg
  • Occiput not constricted behind into a large collar; propodeal angle no longer than maximum spiracle width and not overhanging the declivitous face . . . . . 16

16

return to couplet #15

Aenictus aitkenii casent0905981 h 1 high.jpg
Aenictus aitkenii casent0905981 p 1 high.jpg

17

return to couplet #16

  • Longitudinal rugulae present on propodeal dorsum; head shining except for microreticulate band of occiput . . . . . Aenictus punensis
Aenictus punensis casent0281959 h 1 high.jpg
Aenictus punensis casent0281959 p 1 high.jpg
  • Longitudinal rugulae lacking on propodeal dorsum; head opaque and everywhere microreticulate . . . . . Aenictus pachycerus
Aenictus pachycerus casent0217379 h 1 high.jpg
Aenictus pachycerus casent0217379 p 1 high.jpg