Key to Aenictus species groups
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The following key to Aenictus species groups has been modified from Jaitrong & Yamane (2011).
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- Typhlatta spot present; body black, dark brown to reddish brown => A. laeviceps group
- Typhlatta spot absent; body yellow to yellowish brown => 4
- Mandible subtriangular; masticatory margin with 3 teeth including large apical tooth => A. javanus group
- Mandible triangular; masticatory margin with 9–12 teeth including large apical tooth => A. wroughtonii group
- Anterior clypeal margin concave or almost straight; mandible linear; with mandibles closed a gap present between mandibles and anterior clypeal margin => A. ceylonicus group
- Anterior clypeal margin convex; mandible triangular to subtriangular; with mandibles closed a gap absent between mandibles and anterior clypeal margin => 6
- Typhlatta spot present; head entirely smooth and shiny => 7
- Typhlatta spot absent; head sculptured or smooth and shiny => 9
- Head in full-face view with occipital corner convex, with a distinct protuberance on occipital corner, which gives the head a unique “horned” appearance => A. currax group
- Head in full-face view with occipital corner rounded, without lateral protuberance => 8
- Subpetiolar process well developed, subtriangular with its apex directed downward; worker caste completely monomorphic; propodeum normal => A. leptotyphlatta group
- Subpetiolar process weakly developed or almost absent; worker caste polymorphic; propodeum inflated in major and intermediate workers => A. inflatus group
- Parafrontal ridge essentially absent; head entirely smooth and shiny => A. minutulus group
- Parafrontal ridge well developed; head entirely sculptured or rarely smooth => 10
- First gastral segment micropunctate; subpetiolar process well developed, with posteroventral corner produced posteriad => A. hottai group
- First gastral segment clearly smooth and shiny or weakly shagreened with smooth and shiny interspaces; subpetiolar process weakly developed or almost absent => 11
- Mesonotum demarcated from mesopleuron by a conspicuous ridge; metanotal groove relatively deep and distinct => A. philippinensis group
- Mesonotum not visibly demarcated from mesopleuron; metanotal groove indistinct => A. pachycerus group
- Jaitrong, W. & Yamane, S. 2011. Synopsis of Aenictus species groups and revision of the A. currax and A. laeviceps groups in the eastern Oriental, Indo-Australian, and Australasian regions (Hymenoptera: Formicidae: Aenictinae). Zootaxa, 3128, 1–46.
- Jaitrong, W. & Hashimoto, Y. 2012. Revision of the Aenictus minutulus species group (Hymenoptera Formicidae Aenictinae) from Southeast Asia. Zootaxa 3426, 29-44.