A apex of the metatibia and basal region of the metabasitarsus of Cryptopone gilva in anterior view; worker (ANTWEB1008514); arrows highlight the metatibial spurs B apex of the metatibia and basal region of the metabasitarsus of Belonopelta deletrix in anterior view; worker (ANTWEB1008507); arrows highlight the metatibial spurs C ventroapical portion of the mesotibia of Asphinctopone silvestrii in anteroventral view; worker (CASENT0824505); arrows highlight the minute anterior and much larger posterior spurs D ventroapical portion of the metatibia of Asphinctopone silvestrii in anteroventral view (CASENT0824505); arrows highlight the minute anterior and much larger posterior spurs E ventroapical portion of the mesotibia of Fisheropone ambigua in ventral view; worker (CASENT0906216); arrows highlight the vestigial anterior and well-developed posterior spurs F ventroapical portion of the metatibia of Fisheropone ambigua in oblique anteroventral view (CASENT0906216); arrows highlight a fovea at the place the anterior spur would be located and the large posterior spur. Images by RA Keller (A, B) and FA Esteves (C–F); available at AntWeb.org. Scale bars: 0.03 mm (A, B); 0.004 mm (C–F).