Key to Asian Crematogaster Orthocrema species

This worker key is based on: *[[Media:Hosoishi, S., Ogata, K. 2016. Systematics and biogeography of the ant genus Crematogaster subgenus Orthocrema.pdf|Hosoishi, S. and K. Ogata. 2016. Systematics and biogeography of the ant genus Crematogaster Lund subgenus Orthocrema Santschi in Asia (Hymenoptera: Formicidae). Zoological Journal of the Linnean Society. 176:547–606.]]

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 * Crematogaster
 * Orthocrema

1

 * Propodeal spines directed laterally. Postpetiolar dorsum highly convex in lateral view; postpetiole distinctly higher than petiole in lateral view (Fig. 36) (C. baduvi group) . . . . . 22


 * Propodeal spines directed posteriorly (Fig. 30). Postpetiolar dorsum not highly convex in lateral view; postpetiole as high as petiole in lateral view (Fig. 37) . . . . . 5

2
return to couplet #1
 * Transverse distance between tips of propodeal spines distinctly longer than head width in dorsal view. Mesosoma densely sculptured (Borneo) . . . . . Crematogaster macracantha


 * Transverse distance between tips of propodeal spines shorter than head width in dorsal view. Mesosoma generally smooth and shining . . . . . 3

3
return to couplet #2
 * Propodeal spines curved upward at tip (Fig. 55) (Sulawesi) . . . . . Crematogaster storki


 * Propodeal spines not curved upward at tip (Fig. 56) . . . . . 4

4
return to couplet #3
 * Head smaller (HW 0.43–0.47; HL 0.46–0.49). Scape relatively long (SI 113–118). Propodeal dorsum smooth. Propodeal spines long (PSL 0.20–0.22). Lateral surface of petiole weakly sculptured (Borneo) . . . . . Crematogaster brunensis


 * Head larger (HW 0.47–0.57; HL 0.48–0.59). Scape relatively short (SI 98–108). Propodeal dorsum striated with feeble rugulae. Propodeal spines relatively shorter (PSL 0.15–0.21). Lateral surface of petiole sculptured (W. Malaysia, Borneo, Java, Sumatra) . . . . . Crematogaster baduvi

5
return to couplet #1
 * Metanotal groove not covered by lamellate ridges dorsolaterally (Fig. 28) (Sulawesi) . . . . . Crematogaster moatensis


 * Metanotal groove covered by lamellate ridges dorsolaterally (Fig. 29) . . . . . 6

6
return to couplet #5
 * Posterior portions of mesonotal dorsum forming short triangle-shaped process (Fig. 23). Standing pilosity long and abundant on head, mesosoma, petiole, postpetiole and remains of the gaster (Fig. 57) (C. binghamii group) . . . . . 7


 * Posterior portions of mesonotal dorsum not forming short triangle-shaped process (Fig. 22). Standing pilosity short and sparse (Fig. 58) . . . . . 9

7
return to couplet #6
 * Propodeal spines developed, distinctly longer than diameter of propodeal spiracles (Fig. 59) (S. Thailand, W. Malaysia, Borneo, Java, Sumatra) . . . . . Crematogaster longipilosa


 * Propodeal spines undeveloped, or weakly developed, as long as or shorter than diameter of propodeal spiracles (Figs 60, 61) . . . . . 8

8
return to couplet #7
 * Propodeal spines undeveloped or weakly developed, shorter than diameter of propodeal spiracles (PSL 0–0.03) (Fig. 60) (Nepal, India, Bangladesh, Thailand, Vietnam) . . . . . Crematogaster binghamii


 * Propodeal spines slightly more developed, as long as diameter of propodeal spiracles (PSL 0.04–0.07) (Fig. 61) (Philippines) . . . . . Crematogaster brevispina

9
return to couplet #6
 * Relatively short scape (SI 70–91). Mesosoma sculptured (Fig. 62). Subpetiolar process developed acutely (Fig. 64). Subpostpetiolar process developed acutely (Fig. 64) (C. biroi group) . . . . . 10


 * Relatively long scape (SI 81–100). Mesosoma essentially smooth and shining (Fig. 63). Subpetiolar process developed (Fig. 65). Subpostpetiolar process not developed as process; the venter convex (Fig. 65) (C. quadriruga group) . . . . . 18

10
return to couplet #9
 * Compound eyes reduced, with less than 15 ommatidia (Figs 66, 67) . . . . . 11


 * Compound eyes not reduced, with more than 20 ommatidia (Fig. 68) . . . . . 12

11
return to couplet #10
 * Number of ommatidia approximately 5–6 (Fig. 66) (Borneo) . . . . . Crematogaster masukoi


 * Number of ommatidia approximately 12–15 (Fig. 67) (N. Vietnam) . . . . . Crematogaster ocellata

12
return to couplet #10
 * Dorsal surface of head sculptured (Fig. 69) . . . . . 13


 * Dorsal surface of head generally smooth and shining (Fig. 70) . . . . . 14