The myrmicine ant genus Metapone Forel (Hymenoptera: Formicidae): a global taxonomic review with descriptions of twelve new species Author Taylor, Robert W. Author Alpert, Gary D. text Zootaxa 2016 4105 6 501 545 journal article 39188 10.11646/zootaxa.4105.6.1 9f3191f8-cd86-4a17-ad5b-0c454e0acb8d 1175-5326 271319 DCB6A5BB-46C9-4D05-8B4A-C6E4CBABB6F Key to African and Madagascan Metapone species (Workers) 1. Lateral margins of raised median portion of clypeus markedly convergent anteriorly from the level of the antennal insertions ( Fig 6 ). Petiolar dorsum from above approximately twice as wide as long ( Fig 6 ). Postpetiolar sternite in profile view appearing as a long, slender process ( Fig 5 ) ( Madagascar )............................................ M . emersoni Gregg Lateral margins of raised median portion of clypeus essentially parallel, at most only slightly convergent anteriorly ( Fig 8 ). Petiolar dorsum from above quadrate to transverse, maximally only about 1.4x wider than long ( Fig 3 ). Postpetiolar sternite in side view extended as a much shorter process; digitate or acute in lateral view ( Fig 9 ), obtusely triangular in frontal view... 2 2(1) Median clypeal surface transversely flat to slightly convex; lateral borders not raised; anterior border entire, without median denticles, very slightly concave in frontal view, with a small step-like marginal excision on each side ( Figs 12, 15 ). Smaller species, HW> 0.76mm . ( Angola )........................................................... M. africana sp.n. Median clypeal surface transversely concave, the lateral borders slightly raised, subcarinate; anterior border medially bidentate, lacking anterolateral marginal excisions ( Fig 1 ). Larger species, HW < 0.90mm . ( Madagascar ).................... 3 3(2) Petiolar node from above approximately as wide as long; postpetiolar sternum in side view bluntly rounded ( Figs 9, 11 )........................................................................................... M . vincimus Alpert Petiole from above approximately 1.4 times as wide as long; postpetiolar sternum in side view forming a low acute point ( Figs 2, 3 )............................................................................. M . madagascarica Gregg