Lasioglossum, Curtis, 1833
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publication ID |
https://doi.org/ 10.11646/zootaxa.5404.1.13 |
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publication LSID |
lsid:zoobank.org:pub:A902495B-8A81-4F33-BA18-B8E3E79FA6A9 |
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DOI |
https://doi.org/10.5281/zenodo.10592491 |
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persistent identifier |
https://treatment.plazi.org/id/03A087C0-FFC2-FFDB-FF39-4CBFEB8EF829 |
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treatment provided by |
Plazi |
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scientific name |
Lasioglossum |
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Key to Lasioglossum View in CoL subgenera in North America
Modified from McGinley (1986), Michener (2007), and Gibbs et al. (2013).
1. Second submarginal crossvein (1rs-m) as strong as first (second abscissa of Rs) ( Fig. 16A View FIGURE 16 ), difficult to see in male; head and mesosoma black, except L. pavonotus (Cockerell) ; male clypeus often flat or depressed ventrally; flagellomere 2 subequal to pedicel and flagellomere 1 combined ( Fig. 17A View FIGURE 17 ); body length usually greater (approx. 7–12 mm)..................... 2
- Second submarginal crossvein (1rs-m) weaker than first (second abscissa of Rs) ( Fig. 16B View FIGURE 16 ), at least in female; head and mesosoma variable in colour; male clypeus often rounded; flagellomere variable, if black and moderately large (> 6 mm), then flagellomere 2 longer than pedicel and flagellomere 1 combined ( Fig. 17B View FIGURE 17 )....................................... 3
2. Propodeum with lateral carina well developed, reaching dorsal surface ( Fig. 18A View FIGURE 18 ); dorsal surface coarsely sculptured, shorter than scutellum ( Fig. 18A View FIGURE 18 ); T1 without basal hair band ( Fig. 18A View FIGURE 18 ); head long (length/width ratio = 0.88–1.0) ( Fig. 19A View FIGURE 19 ); male gonostylus without retrorse lobe ( Fig. 20A View FIGURE 20 )................................................... L. (Leuchalictus)
- Propodeum with lateral carina usually poorly developed, not reaching dorsal surface ( Fig. 18B View FIGURE 18 ), but if strong ( Figs. 18C, 18D View FIGURE 18 ) then dorsal surface longer than scutellum ( Fig. 18C View FIGURE 18 ) or weakly sculptured ( Fig. 18C View FIGURE 18 ) or T1 with basal hair band or head short ( Fig. 18D View FIGURE 18 ) (length/width ratio = 0.77–0.89) ( Fig. 19B View FIGURE 19 ); male gonostylus with retrorse lobe ( Fig. 20B View FIGURE 20 ).... L. ( Lasioglossum View in CoL )
3(1). Head and mesosoma distinctly metallic (green, blue, or golden)................................................ 4
- Head and mesosoma black-brown, at most with weak reflections............................................... 6
4. Head and mesosoma brilliant metallic (Antillean, southern Florida); male inner metatibial spur typically pectinate; male gonostylus without retrorse lobe........................................................... L. ( Habralictellus )
- Head and mesosoma dull metallic; male inner metatibial spur ciliate; male gonostylus with retrorse lobe................ 5
5. Body size usually small (3.5–6 mm); female T1 usually with appressed hairs at least laterally ( Fig. 21A View FIGURE 21 ) in North American species (except L. ruidosense View in CoL and L. petrellum (Cockerell) View in CoL species complexes, L. microlepoides (Ellis) View in CoL , L. pavoninum (Ellis)) View in CoL , typically lacking erect hairs medially; female mandible almost always with small preapical tooth ( Fig. 21B View FIGURE 21 ), except in the wood-nesting L. coeruleum (Robertson)) View in CoL (cosmopolitan)............................................ L. (Dialictus)
- Body size usually larger (6–8 mm); female T1 without appressed hairs, medially with distinct erect hairs ( Fig. 22A View FIGURE 22 ); female mandible often strongly bidentate ( Fig. 22B View FIGURE 22 ), if preapical tooth small, then propodeum with distinct lateral carina reaching dorsal margin (primarily from Panama to Mexico, except L. aquilae View in CoL , which reaches to high elevation areas in the southwestern USA)................................................................................ L. (Eickwortia s.l.)
6 (3). Head wide ( Fig. 23A View FIGURE 23 ); female inner metatibial spur with fine oblique teeth, not as tall as width of main rachis ( Fig. 23A View FIGURE 23 ); male gonostylus without retrorse lobe; metasomal sterna with erect pubescence.............................. L. ( Evylaeus )
- Head usually longer ( Fig. 23B View FIGURE 23 ); female inner metatibial spur usually with longer, narrow or fat teeth, often taller than width of main rachis basally ( Fig. 24B View FIGURE 24 ); male gonostylus with retrorse lobe; metasomal sterna with variable pubescence.......... 7
7. Foretibia of female with long projection ( Fig. 25A View FIGURE 25 ); metapostnotum enclosed by carina, with distinct parallel carinulae ( Fig. 26A View FIGURE 26 ); frons with two bulbous protuberances ( Fig. 26B View FIGURE 26 ); retrorse lobe absent (Neotropical)....................................................................... L. gattaca View in CoL complex ( L. gattaca View in CoL and L. hartmanni Danforth and Wcislo View in CoL )
- Foretibia of female without long projection ( Fig. 25B View FIGURE 25 ); metapostnotum not as above; retrorse lobe present (widespread)... 8
8. Female mandible strongly bidentate ( Fig. 27 View FIGURE 27 ), subapical tooth nearly equal to apical one; male metasoma with entirely paleorange sterna; gonobase at middorsum less than one-fourth length of gonocoxite; T1 narrow or apex of clypeus distinctly thick ( Mexico and Central America)........................................................... L. (Eickwortia s.s.)
- Female mandible with small preapical tooth dorsally; male gonobase at middorsum usually more than one-third length of gonocoxite.......................................................................................... 9
9. Either propodeum with weak lateral carina and fully developed scopa ( Figs. 28A, 28B View FIGURE 28 ) or mesosoma coarsely sculptured on pleuron and carina appearing to reach dorsal surface ( Figs. 28C, 28D View FIGURE 28 ); male metasomal sterna with erect pubescence; male antennae usually relatively short; male heads sometimes enlarged with long mandibles ( Fig. 28E View FIGURE 28 )....... L. (Hemihalictus)
- Either propodeum with weak lateral carina and highly modified reduced scopa ( Figs. 29A, 29B View FIGURE 29 ) or mesosoma weakly rugose at most and propodeum with complete carina ( Figs. 29C, 29D View FIGURE 29 ); male metasomal sterna nearly bare, except in Onagraceae View in CoL specialists; male antennae relatively long ( Fig. 4C View FIGURE 4 ); male heads not enlarged ( Fig. 4B View FIGURE 4 ).............. L. ( Sphecodogastra )
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.