Key to Old World Acropyga Workers

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This key to workers is based on LaPolla (2004) [1], modified adding Acropyga bakwele described in LaPolla and Fisher (2005)[2]

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1

  • Australasian, Indo-Australian, and Oriental regions and southern Japan . . . . . 4

2

return to couplet #1

  • Head width < 0.55 mm; mandible with 4-8 teeth; West and East Africa and southern Europe . . . . . 3a
  • Head width > 0.55 mm; mandible with 6-9 teeth; southern Africa only . . . . . 3b

3a

return to couplet #2

  • Basal tooth distinctly offset from masticatory margin; torulae not particularily closely set; southern Europe (Greece) . . . . . Acropyga paleartica
  • Basal tooth not distinctly offset from masticatory margin; torulae closely set; West to East Africa . . . . . Acropyga silvestrii
Acropyga silvestrii casent0178254 profile 1.jpg

3b

return to couplet #2

  • Head width <0,7 mm; total length <3 mm; erect hairs concentrated on the posterior pronotum; median ocellus absent. . . . . Acropyga arnoldi
MCZ ENT Acropyga arnoldi hal.jpg
  • Head width >0,7 mm; total length >3 mm; erect hairs scattered throughout dorsum; median ocellus present. . . . . Acropyga bakwele
Acropyga bakwele casent0104123 profile 1.jpg


4

return to couplet #1

  • Basal mandibular tooth large, rectangular and apically truncated . . . . . 5
  • Basal mandibular tooth roughly triangular, similar in size and shape to other teeth . . . . . 7

5

return to couplet #4

Acropyga inezae casent0906269 p 1 high.jpg
  • Mandible with 5 teeth; head width > 0.45 mm . . . . . . 6

6

return to couplet #5

  • Larger species (TL: 2 . 1 6-2.52); head width > 0.53 mm . . . . . Acropyga butteli
Acropyga butteli (as Acropyga baodaoensis) side (www.niaes.affrc.go.jp).jpg
Acropyga nipponensis side (www.niaes.affrc.go.jp).jpg

7

return to couplet #4

  • Mandible with 3-4 teeth; antennae with 7- 11 segments . . . . . 8
  • Mandible with 5 or more teeth; antennae with 9-11 segments . . . . . 12

8

return to couplet #7

9

return to couplet #8

Acropyga oceanica casent0905162 h 1 high.jpg
Acropyga oceanica casent0905162 p 1 high.jpg

10

return to couplet #8

  • Head flat in appearance with posterolateral comers at near right angles; torulae widely separated from each other; sides of head parallel; inner mandibular margin uneven, with slight bulge before masticatory margin . . . . . Acropyga kinomurai
  • Head not flat in appearance, with rounded posterolateral comers; torulae not widely separated; sides of head not parallel; inner mandibular margin even, without bulge before masticatory margin . . . . . 11

11

return to couplet #10

  • Antennae with 8-9 segments; mandible always with 4 teeth, the basal tooth separated by a short diastema . . . . . Acropyga lauta
Acropyga lauta casent0171066 p 1 high.jpg
  • Antennae with 11 segments; mandible with 3-4 teeth, the basal tooth not separated by a short diastema . . . . . Acropyga sauteri
Acropyga sauteri casent0909907 p 1 high.jpg

12

return to couplet #7

  • Metamesosomal dorsum with distinct erect hairs; long erect hairs along posterior margin of head . . . . . 13
  • Metamesosomal dorsum without distinct erect hairs; without long erect hairs along posterior margin of head . . . . . 16

13

return to couplet #12

  • Mandible with 5 teeth and fine striate sculpture running along dorsal surface of mandible; larger species (total length typically > 2.5 mm) . . . . . 14
  • Mandible with 6 teeth and no fine striate sculpture along dorsal surface of mandible; smaller species (total length typically < 2.5 mm) . . . . . 15

14

return to couplet #13

  • Fine mandibular striate sculpture distinct, running from near base of teeth to near mandibular articulation point . . . . . Acropyga acutiventris
Acropyga acutiventris ANIC32-018689 side 40-Antwiki.jpg
  • Fine mandibular striate sculpture indistinct, running from near base of teeth, but fading or disappearing altogether midway across mandible (midpoint measured from masticatory margin to articulation point) . . . . . Acropyga rubescens
Acropyga rubescens casent0903175 p 1 high.jpg

15

return to couplet #13

  • Anterior clypeal margin strongly bulging forward medially, forming a distinct “beaklike” projection; smaller species, HW < 0.5, SL < 0.5; longest erect hairs on mesosomal dorsum about twice as long as shorter erect or appressed hairs . . . . . Acropyga gelasis
Acropyga gelasis casent0903177 p 1 high.jpg
  • Anterior clypeal margin not strongly bulging forward medially, not forming a distinct “beaklike” projection; larger species, HW > 0.54, SL > 0.5; longest erect hairs on mesosomal dorsum about 3 times as long as shorter erect or appressed hairs . . . . . Acropyga hystrix
Acropyga hystrix casent0903179 p 1 high.jpg

16

return to couplet #12

  • Larger species, total length > 2.7 mm; head width > 0.6 mm; dorsal surface of mandible with a dense layer of hairs; Australia only . . . . . Acropyga myops
Acropyga myops ANIC32-018588 side 50-Antwiki.jpg
  • Smaller species, total length < 2.7 mm; head width < 0.6 mm; dorsal surface of mandible without a dense layer of hairs; Australia and other regions . . . . . 17

17

return to couplet #16

  • Basal tooth separated from other teeth by a distinct diastema; basal tooth margin not smoothly continuous with inner mandibular margin; basal tooth apex pointing slightly downward . . . . . Acropyga ambigua
Acropyga ambigua casent0249914 p 1 high.jpg
  • Basal tooth not separated from other teeth by a distinct diastema; basal tooth margin smoothly continuous with inner mandibular margin; basal tooth apex not pointing downward . . . . . 18

18

return to couplet #17

  • Scape length > 0.39, often surpassing posterior margin; pronotum without an anterior shelf; mandible with 6 teeth . . . . . Acropyga dubia
Acropyga dubia casent0906271 p 1 high.jpg
  • Scape length < 0.39, often failing to reach posterior margin; pronotum with an anterior shelf; mandible with 5-7 teeth . . . . . Acropyga pallida
Acropyga pallida ANIC32-018505 head 80-Antwiki.jpg
Acropyga pallida ANIC32-018505 side 50-Antwiki.jpg

References

  1. LaPolla, J.S. 2004a. Acropyga of the world. Contributions of the American Entomological Institute 33 (3): 1-130. PDF
  2. LaPolla, J.S. & Fisher, B.L. 2005. A remarkable new species of Acropyga from Gabon, with a key to the Afrotropical species. Proceedings of the California Academy of Sciences (4) 56: 601-605. PDF