Key to Dilobocondyla Species

This worker key is modified from: Chen, Z., Li, W., Zhou, S. 2019. Taxonomic review of the ant genus Dilobocondyla from China (Hymenoptera: Formicidae), with a revised key to the known species. Zoological Systematics 44(2): 132–139 (doi:10.11865/zs.201908).

The key is based on keys by Wheeler (1924), Bharti and Kumar (2013), and Zettel and Bruckner (2013)

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1

• Head in full-face view with posterior margin strongly and continuously concave (except for D. fulva) (Philippines) . . . . . 2

• Head in full-face view with posterior margin nearly straight or only weakly concave in middle . . . . . 8

2

return to couplet #1

• Petiole with a sharp and highly raised transverse ridge; anterodorsal face of postpetiole with conspicuous longitudinal rugae (Philippines) . . . . . Dilobocondyla carinata

Dilobocondyla carinata

• Petiole without transverse ridge; anterodorsal face of postpetiole differently sculptured, without conspicuous longitudinal rugae . . . . . 3

3

return to couplet #2

• Mesosoma entirely or chiefly blackish brown or black . . . . . 4

• Mesosoma yellowish to light brown . . . . . 6

4

return to couplet #3

• Antennal scrobe moderately developed, dorsally limited by fine frontal carina that posteriorly fading and not reaching posterior corners of head (Indo-Australian Region) . . . . . Dilobocondyla selebensis

• Antennal scrobe strongly developed, dorsally limited by prominent frontal carina that reaches posterior corner of head . . . . . 5

5

return to couplet #4

• Gastral tergite I with yellow base (Philippines) . . . . . Dilobocondyla rugosa

Dilobocondyla rugosa

• Gastral tergite I entirely dark (Philippines) . . . . . Dilobocondyla silviae

Dilobocondyla silviae

6

return to couplet #3

• Frontal carinae not continuing to posterior corners of head and not so prominent; antennal scrobes moderately deep (Australia and New Guinea) . . . . . Dilobocondyla cataulacoidea

• Frontal carinae prominent, continuing to posterior corners of head; scrobes deeper . . . . . 7

7

return to couplet #7

• Boundary unconspicuous between dorsum of propodeum and declivity. Dorsum of mesosoma with reticulation, interspaces smooth and shining (Singapore) . . . . . Dilobocondyla fulva

• Boundary conspicuous between dorsum of propodeum and declivity. Dorsum of mesosoma with irregular rugae, appear dull (Philippines) . . . . . Dilobocondyla chapmani

8

return to couplet #1

• Mesosoma, petiole, postpetiole and gaster almost unanimously color . . . . . 9

• Mesosoma, petiole, postpetiole and gaster distinctly bicolor . . . . . 14

9

return to couplet #8

• Anterior margin of pronotum with distinct ridge (Sri Lanka) . . . . . Dilobocondyla didita

• Anterior margin of pronotum without ridge . . . . . 10

10

return to couplet #9

• Posterior margin of head nearly straight. Petiole relatively shorted, with DPI ≥0.60 (Philippines) . . . . . Dilobocondyla oswini

Dilobocondyla oswini

• Posterior margin of head with concavity at its middle. Petiole relatively elongated, with DPI≤0.52 . . . . . 11

11

return to couplet #10

• Dorsal margin of propodeum in lateral view distinctly lower than pronotum (India) . . . . . Dilobocondyla bangalorica

• Dorsal margin of propodeum in lateral view almost at same level with pronotum, or slightly lower than pronotum . . . . . 12

12

return to couplet #11

• Body brownish black; frontal triangle indistinct (Indo-Australian Region) . . . . . Dilobocondyla borneensis

• Body red or yellowish brown; frontal triangle distinct . . . . . 13

13

return to couplet #12

• Head slightly longer than width; clypeus with delicate carinae, with anterior margin feebly emarginated in middle. Petiole much longer, more than twice length of width (Indonesia) . . . . . Dilobocondyla karnyi

• Head wider than length; clypeus with a strong median and two lateral carinae, with anterior margin strongly emarginate in middle. Petiole comparatively short, less than twice length of width (Malaysia) . . . . . Dilobocondyla yamanei

14

return to couplet #8

• Mesosoma, petiole and postpetiole black; gaster distinctly reddish brown (China) . . . . . Dilobocondyla rufida

• Mesosoma, petiole and postpetiole yellowish to blackish red; gaster brown to black . . . . . 15

15

return to couplet #14

• Gaster paler, with yellow pilosity (Indonesia) . . . . . Dilobocondyla sebesiana

• Gaster brown to black, with whitish pilosity . . . . . 16

16

return to couplet #15

• Petiole more than 2.5 times length of width; dorsal margin weakly convex . . . . . 17

• Petiole less than 2 times length of width; dorsal margin distinct convex . . . . . 18

17

return to couplet #16

• Clypeus with 5 strong carinae. Body dorsum with subdecumbent hairs (China) . . . . . Dilobocondyla gaoyureni

• Clypeus with 3 strong carinae. Body dorsum with stiff erect hairs (Vietnam) . . . . . Dilobocondyla propotriangulata

18

return to couplet #16

• Gaster smooth and shiny. Legs smooth, yellowish brown (China and Vietnam) . . . . . Dilobocondyla fouqueti

• Gaster reticulate and opaque. Legs opaque with fine sculpture, blackish . . . . . 19

19

return to couplet #18

• Posterior corners of head blunt and not forming a dent. Posterior 1/3 of head dorsum without reticulation (Vietnam) . . . . . Dilobocondyla eguchii

• Posterolateral corners of head acute and forming a dent. Posterior 1/3 of head dorsum with reticulation . . . . . 20

20

return to couplet #19

• Head castaneous. Anterior lateral angles of pronotum acute. Dorsum of petiole slightly convex in profile. Petiole with a digitation (Indonesia) . . . . . Dilobocondyla selebensis simalurana

• Head blackish. Anterior lateral angles of pronotum blunt. Dorsum of petiole arcuate in profile. Petiole with a strong antero-ventral tooth (India) . . . . . Dilobocondyla gasteroreticulata