Key to Carebara of India

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These keys to the minor workers, major workers and queens is based on: Bharti, H. & Kumar, R. 2013. Six new species of Carebara Westwood (Hymenoptera: Formicidae) with restructuring of world species groups and a key to Indian species. J. Entomol. Res. Soc. 15(1):47-67.

The key to major workers also includes additions from: Bharti, H., Akbar, S. A. & Aldawood, S. A. 2014. New additions to ant genus Carebara Westwood (Hymenoptera: Formicidae: Myrmicinae) from India. Acta Zoologica Academiae Scientiarum Hungaricae, 60, 313-324.

Five Carebara species from India were described and are known only from the queen, or queen and male, caste: Carebara bengalensis (Forel, 1902), Carebara lamellifrons (Forel, 1902), Carebara leei (Forel, 1902), Carebara raja (Forel, 1902), and Carebara rothneyi (Forel, 1902).

There are keys to: Minor Workers . . . Major Workers . . . Queens

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Minor Workers

Carebara similis is excluded from this key

1

Carebara carinata casent0906089 p 1 high.jpg

2

return to couplet #1

3

return to couplet #2

  • TL 2.5 mm; articulation of the femora and tibiae of the legs with a brown ring . . . . . Carebara lignata
  • TL 1mm; articulation of the femora and tibiae of the legs without brown ring . . . . . Carebara asina

4

return to couplet #2

  • Eyes absent or with single ommatidium; clypeus with lateral carinae . . . . . 5

5

return to couplet #4

  • Propodeum rounded or obtusely angled, not dentate . . . . . 6

6

return to couplet #5

  • Head reticulate or densely fovulate punctured; propodeal lobes large and broad with rounded posterior margin; mandibles with 4 teeth . . . . . Carebara propomegata
Carebara propomegata casent0906095 p 1 high.jpg
  • Head smooth or rugulose; propodeal lobes small, narrow or absent; mandibles with 5 acute teeth . . . . . 7

7

return to couplet #6

8

return to couplet #7

  • Eyes situated at a distance of 0.08 mm from mandibular insertions into head; EI 6.25-7.41 , SI 75-77.78 . . . . . Carebara dentata
  • Eyes situated at more than distance of 0.08 mm from mandible insertion into head; EI ≤ 4 , SI ≤ 72 . . . . . 9

9

return to couplet #8

  • Eyes elongate, not rounded, sides of head comparatively weakly convex; EI 3.12 , SI 71.88 . . . . . Carebara hornata
  • Eyes rounded, sides of head comparatively strongly convex; EI 3.13-3.33 , SI 68.75-70 . . . . . Carebara rectangulata

Major Workers

1-ma

2-ma

return to couplet #1-ma

  • Eyes distinct with numerous ommatidia (>8); base of first gastral tergite finely reticulate with traces of fine longitudinal rugae . . . . . Carebara aborensis
  • Eyes rudimentary with few ommatidium (<4); base of first gastral tergite smooth and shinning . . . . . 3-ma

3-ma

return to couplet #2-ma

Carebara rectangulata casent0906097 p 1 high.jpg

4-ma

return to couplet #3-ma

  • Vertexal corners protruding into a pair of well developed acute horns or spines . . . . . 5-ma
  • Vertex with a pair of small minute horns or teeth in lateral view . . . . . 6-ma

5-ma

return to couplet #4-ma

  • Head rectangular with straight parallel sides, punctured only at the base of hairs and finely longitudinally rugulose anteriorly; occiput and vertex smooth and shinning . . . . . Carebara hornata
Carebara hornata casent0906094 p 1 high.jpg
  • Head with convex sides, sparsely punctured and anteriorly obscurely longitudinally striate; occiput and vertex wrinkled . . . . . Carebara asina

6-ma

return to couplet #4-ma

  • Propodeum unarmed, posterodorsal corner rounded or bluntly angled . . . . . 7-ma

7-ma

return to couplet #6-ma

  • Cephalic dorsum unsculptured, smooth and shining; vertexal horns reduced . . . . . Carebara dentata
Carebara dentata casent0906090 p 1 high.jpg
  • Cephalic dorsum sculptured, dull; vertexal horns well-developed . . . . . Carebara terayamai

8-ma

return to couplet #6-ma

  • Head with lateral sides convex, almost as long as broad (CI 84-85) . . . . . Carebara spinata
Carebara spinata casent0906099 p 1 high.jpg
  • Head with parallel lateral sides, longer than broad (CI 74-78) . . . . . 9-ma

9-ma

return to couplet #8-ma

  • Anterior margin of clypeus concave without lateral developed teeth; Propodeal spines well developed; masticatory margin of mandible with 5-teeth . . . . . Carebara obtusidenta
  • Anterior margin of clypeus with two prominent lateral teeth; Propodeal spines reduced; masticatory margin of mandible with 4-teeth . . . . . . Carebara mukkaliensis

Queens

1-q

2-q

return to couplet #1

Carebara lignata casent0901965 p 1 high.jpg

3-q

return to couplet #1-q

4-q

return to couplet #3-q

5-q

return to couplet #4-q

  • Anterior border of clypeus emarginated in the middle; body 5-5.5 mm longer . . . . . Carebara raja
  • Anterior border of clypeus not emarginated, body 7-8 mm longer . . . . . Carebara leei

6-q

return to couplet #3-q

  • Postpetiole transverse, much broader than long . . . . . Carebara asina