Trigona
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publication ID |
https://doi.org/ 10.17161/jom.i105.15734 |
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publication LSID |
lsid:zoobank.org:pub:3637F70F-42FC-461E-82B3-A847752A071A |
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persistent identifier |
https://treatment.plazi.org/id/03D58783-FF88-FFAB-FE47-ED94FB66FDD4 |
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treatment provided by |
Felipe |
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scientific name |
Trigona |
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Key to Subgenera of Trigona View in CoL
(worker caste)
1. Mandible with four teeth .......................................................................................... 2
—. Mandible with five teeth ( Figs. 130 View Figures 128–130 , 147 View Figures 147–148 ) ................................................................. 3
2(1). Labrum simple, surface gently and evenly convex; wings dichroic, proximally infuscate, apically whitish (e.g., Fig. 136 View Figures 133–136 ); pterostigma yellowish brown; scape black ........................................................................ Aphaneuropsis Engel , n. subgen.
—. Labrum bigibbous, with pronounced mediolongitudinal furrow (e.g., Fig. 130 View Figures 128–130 ); wings uniformly fuscous; pterostigma brown to dark brown; scape lighter ventrally, light brown to yellowish brown ................... Koilotrigona Engel , n. subgen.
3(1). Metatibia with distinct corbicula on apical prolateral surface (corbicular surface concave) ( Fig. 132 View Figures 131–132 ), superior distal angle present ( Fig. 132 View Figures 131–132 ), retromarginal fringe setae abundant ( Fig. 132 View Figures 131–132 ) ................................................................................ 4
—. Metatibia without defined corbicula on apical prolateral surface (corbicular surface not concave) ( Fig. 131 View Figures 131–132 ), superior distal margin rounded ( Fig. 131 View Figures 131–132 ), retromarginal fringe setae less numerous ( Fig. 131 View Figures 131–132 ) ..... Necrotrigona Engel , n. subgen.
4(3). Labrum simple, surface gently and evenly convex; vertex with distinct postocellar ridge ( Figs. 135 View Figures 133–136 , 138, 139 View Figures 137–139 , 144–148 View Figures 144–146 View Figures 147–148 ); integument entirely dark brown to black ( Figs. 133, 134 View Figures 133–136 , 138 View Figures 137–139 , 144, 145 View Figures 144–146 , 147 View Figures 147–148 ) (except entirely orange in T. dallatorreana Friese View in CoL ) ........................................................................................................................... 5
—. Labrum bigibbous, with mediolongitudinal furrow ( Fig. 130 View Figures 128–130 ) (furrow somewhat weak in T. williana Friese View in CoL ); vertex without postocellar ridge ( Fig. 129 View Figures 128–130 ), or ridge quite weak; integument largely yellowish orange ( Figs. 128, 129 View Figures 128–130 ) (head, mesoscutum, and parts of pleura sometimes largely black but clypeus and antenna always yellowish to yellowish orange) ............................... Aphaneura Gray
5(4). Wing membrane not as below, if slightly lighter apically, then transition gradual across wing length; metatibial width variable, sometimes comparatively narrow ............................................................................................................................... 6
—. Wing membrane strikingly dichroic, proximally darkly infuscate, apically whitish ( Figs. 133, 136 View Figures 133–136 ); metatibia broad apically, with broadly rounded retromarginal contour ( Fig. 133 View Figures 133–136 ) ......................................... Dichrotrigona Engel , n. subgen.
6(5). Small bees, head width 2.5 mm or less; forewing (including tegula) length less than 6.5 mm; metatibia narrow, retromarginal contour comparatively straight until apical fifth ........................................................................................................... 7
—. Larger bees, head width typically 2.5 mm or greater, rarely as small as 2.45 mm (in some T. corvina Cockerell View in CoL ), forewing (including tegula) length 6.9 mm or greater; metatibia broader, typically with broadly rounded retromarginal contour ......................................................................................... Trigona Jurine View in CoL , s.str.
7(6). Apical fundal surface of metatibia near corbicula with abundant minute, fine, appressed setae ( Figs. 140, 141 View Figures 140–143 ); scape with prominent, thick, black bristles along length, such bristles often as long as scape diameter ( Figs. 145 View Figures 144–146 , 149 View Figures 149–150 ); clypeus in profile with numerous, erect, black bristles; distance from median ocellus to postocellar ridge about ocellar diameter ( Fig. 146 View Figures 144–146 ); smaller bees, intertegular distance 1.35 mm or less .......................................... Nostotrigona Engel , n. subgen.
—. Apical fundal surface of metatibia near corbicula with minute, fine, appressed setae either lacking or exceedingly sparse ( Figs. 142, 143 View Figures 140–143 ); scape without thick bristles, with fine, lighter setae, such setae shorter than scape diameter ( Fig. 147 View Figures 147–148 , 150 View Figures 149–150 ); clypeus in profile with a few short, fine setae, without black bristles; distance from median ocellus to postocellar ridge less than ocellar diameter ( Fig. 148 View Figures 147–148 ); larger bees, interegular distance 1.4 mm or greater ................................ ......................................................................................... Ktinotrofia Engel , n. subgen.
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