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Key to Asian Crematogaster Orthocrema species
This worker key is based on: 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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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
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- 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
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- Propodeal spines curved upward at tip (Fig. 55) (Sulawesi) . . . . . Crematogaster storki
- Propodeal spines not curved upward at tip (Fig. 56) . . . . . 4
4
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- 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
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- Metanotal groove not covered by lamellate ridges dorsolaterally (Fig. 28) (Sulawesi) . . . . . Crematogaster moatensis
- Metanotal groove covered by lamellate ridges dorsolaterally (Fig. 29) . . . . . 6
6
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- 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
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- 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
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- 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
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- 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
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- 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
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- Number of ommatidia approximately 5–6 (Fig. 66) (Borneo) . . . . . Crematogaster masukoi
- Number of ommatidia approximately 12–15 (Fig. 67) (N. Vietnam) . . . . . Crematogaster ocellata
12
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- Dorsal surface of head sculptured (Fig. 69) . . . . . 13
- Dorsal surface of head generally smooth and shining (Fig. 70) . . . . . 14
13
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- Head, mesosoma, petiole and postpetiole strongly sculptured reticulately. Propodeal spiracles apart from metapleural gland bulla (Fig. 71). Petiole squared, but without angulate anterolateral corners (Fig. 73) (Thailand, W. Malaysia, Borneo) . . . . . Crematogaster reticulata
- Head, mesosoma, petiole and postpetiole weakly sculptured reticulately. Propodeal spiracles touching metapleural gland bulla (as in Figure 72). Petiole squared with angulate anterolateral corners (Fig. 74) (Taiwan) . . . . . Crematogaster schimmeri
14
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- Dorsal surface of head generally smooth, but feebly sculptured at surrounding portion of compound eyes (Fig. 75). Area in front of occipital carinae sculptured (Fig. 77) (India, Sri Lanka) . . . . . Crematogaster biroi
- Dorsal surface of head smooth, without sculptured area in front of occipital carinae (Fig. 76) . . . . . 15
15
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- Head, mesosoma, petiole and postpetiole with erect setae: setae tapering distally (Fig. 78) . . . . . 16
- Head, mesosoma, petiole and postpetiole with erect setae; setae stout and not tapering distally (Fig. 79) . . . . . 17
16
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- Propodeal spines slender (Fig. 80). Petiole tapering posteriorly in dorsal view (Fig. 82). Subpostpetiolar process angulate (Fig. 80) (China, Korea, Japan) . . . . . Crematogaster osakensis
- Propodeal spines thick (Fig. 81). Petiole with subparallel sides in dorsal view (Fig. 83). Subpostpetiolar process developed acutely (Fig. 81) (Vietnam) . . . . . Crematogaster vieti
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17
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- Scape with suberect to decumbent setae (Fig. 84). Erect setae on anterior mesonotal ridge as long as on posterior mesonotal ridge (Fig. 86). Fourth abdominal tergite with erect setae abundantly (c. > 20) (Philippines) . . . . . Crematogaster luzonensis
- Scape with appressed setae (Fig. 85). Erect setae on anterior mesonotal ridge longer than on posterior mesonotal ridge (Fig. 87). Fourth abdominal tergite with erect setae sparsely (c. 4–6) (W. Malaysia, Borneo, Sumatra, Sulawesi) . . . . . Crematogaster fritzi
18
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- Compound eyes reduced, with c. 6 ommatidia (Fig. 88) (W. Malaysia, Borneo, Sumatra) . . . . . Crematogaster myops
- Compound eyes not reduced, with more than 20 ommatidia (Fig. 89) . . . . . 19
19
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- Propodeal spiracles large and touching metapleural gland bulla (Fig. 90) . . . . . 20
- Propodeal spiracles relatively small and apart from metapleural gland bulla (Fig. 91) . . . . . 23
20
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- Lamellate ridge superficially covering metanotal groove in some specimens, but metanotal groove deep, U-shaped in lateral view (Fig. 92). Propodeal spines long and stout (Fig. 92) (PSL 0.09–0.1) (Sulawesi) . . . . . Crematogaster celebensis
- Lamellate ridge superficially covering metanotal groove in some specimens, but metanotal groove not so deep, V-shaped in lateral view (Fig. 93). Propodeal spines relatively short to long (Fig. 93) (PSL 0.05–0.11) . . . . . 21
21
- Propodeal spines relatively short (PSL 0.05–0.08) and stout (Fig. 90) (S. Thailand, W. Malaysia, Borneo, Java, Sumatra, Krakatau) . . . . . Crematogaster bandarensis
- Propodeal spines relatively long (PSL 0.08–0.11) and slender (Fig. 93). . . . . . 22
22
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- Scape with suberect setae only. Body color yellow (Philippines) . . . . . Crematogaster philippinensis
- Scape with suberect setae mixed with two to three longer setae. Body bicolored, with head and gaster brown, and mesosoma, petiole and postpetiole yelow (Borneo, Sumatra) . . . . . Crematogaster sundalandensis
23
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- Longitudinal rugulae on clypeus not reaching area between frontal carinae. Body bicolored, with head, mesosoma, petiole, postpetiole and first gastral tergite yellow, and remains of gaster brown in typical form, but rarely whole body yellowish. Petiole with subparallel sides in dorsal view (Fig. 94) (Laos, Cambodia, Thailand, Sumatra) . . . . . Crematogaster quadriruga
- Longitudinal rugulae on clypeus extending to posterior clypeal margin. Body color yellow. Petiole tapering anteriorly in dorsal view (Fig. 95) (Japan) . . . . . Crematogaster suehiro
