The neotropical stingless bee genus Nannotrigona Cockerell (Hymenoptera: Apidae: Meliponini): An illustrated key, notes on the types, and designation of lectotypes Author Rasmussen, Claus Author Gonzalez, Victor H. text Zootaxa 2017 4299 2 191 220 journal article 32550 10.11646/zootaxa.4299.2.2 dbcf3047-c345-42a7-b3ef-c47791597613 1175-5326 839357 C320AAF8-1057-432A-B4D7-1CCC6D2B5BB7 Key to the species of Nannotrigona (workers) 1. Mesoscutum sparsely punctate, shiny among punctures ( Fig. 2 A, C); smaller species, head width < 1.6 mm , mesoscutum width < 1.3 mm ................................................................................( dutrae group) 2 - Mesoscutum and mesoscutellum densely and coarsely foveate with depressions enclosed by ridgelike elevations, giving foveae a rugulose appearance ( Fig. 2 B); larger species, head width> 1.6 mm , mesoscutum width> 1.3 mm ....................3 2(1). Omaulus rounded; clypeus and paraocular area distinctly pubescent ( Fig. 7 B); posterior margin of mesoscutellum and outer surfaces of fore- and mesotibiae with long setae (> diameter of F3); head more than 1.2 times as broad as long.... N. schultzei - Omaulus strongly carinate ( Fig. 2 C); clypeus and paraocular area with smooth and largely glabrous areas ( Fig. 7 A); posterior margin of mesoscutellum and outer surfaces of fore- and mesotibiae largely asetose; head less than 1.2 times as broad as long............................................................................................. N. dutrae 3(1). Base of antennal scape with long setae, at least as long as diameter of scape ( Fig. 2 E).................. ( mellaria group) 4 - Base of antennal scape covered with appressed or erect setae, much shorter than diameter of scape ( Fig. 2 D)................................................................................................( testaceicornis group) 7 4(3). Posterior margin of mesoscutellum with deep and semicircular emargination ( Fig. 3 A); depth of emargination, as measured from an imaginary line between apices of teeth to its base, 1.2 times greater than diameter of F3; forewing length, including tegula, approximately 5.0 mm............................................................................5 - Posterior margin of mesoscutellum with shallower emargination ( Fig. 3 B); depth of emargination at most 0.5 times diameter of F3; forewing length, including tegula, approximately 4.5 mm ...................................................6 5(4). Tessellation of T2 and T3 without glabrous intersections, giving the surface a matte appearance; mesoscutellum 1.5 times broader than long; legs brown or darker; maculations bright yellow, including on axillae, lateral border of mesoscutum, and apical teeth of mesoscutellum.................................................................... N. mellaria - Tessellation of T2 and T3 with glabrous intersections, almost shiny; mesoscutellum less than 1.5 times broader than long; legs ferruginous; maculations reduced or faint yellow, including on axillae, lateral border of mesoscutum, and apical teeth of mesoscutellum................................................................................ N. tristella 6(4). Base of antennal scape with setae less than 1.3 times longer than the diameter of scape; flagellar segments usually testaceous........................................................................................... N. chapadana - Base of antennal scape with longest setae at least 1.7 times longer than the diameter of scape; flagellar segments usually brown......................................................................................... N. melanocera 7(3). Ocellocular area, between lateral ocellus and inner margin of compound eye, with contiguous punctures similar to those on frons ( Fig. 3 C); carina of pronotal lobe, in dorsal view, not projecting into an angle................................ 8 - Ocellocular area, between lateral ocellus and inner margin of compound eye, with scattered and larger punctures than on frons ( Fig. 3 D); carina of pronotal lobe, in dorsal view, projecting into an angle.........................................9 8(7). Wing membrane, veins and pterostigma light reddish brown contrasting with wing apex dark grayish brown; posterior margin of mesoscutellum with deep, semicircular emargination, about 1.8 times broader than long............. N. camargoi n. sp. - Wings brownish, veins and pterostigma dark brown; posterior margin of mesoscutellum with shallower emargination, about 3.8 times broader than long................................................................. N. perilampoides 9(7). Clypeus shiny, with minute shallow punctures ( Fig. 3 F); antennal flagellum blackish to brownish.............. N. punctata - Clypeus duller, with minute, coarse punctures ( Fig. 3 E); antennal flagellum light reddish brown.......... N. testaceicornis Trigona dutrae Friese, 1901 : 267 [ lectotype : ZMHB; worker, Pará , Brazil ] new lectotype designation