Exaerete Hoffmannsegg

Anjos-Silva, Evandson José Dos & Rebêlo, José Manuel Macário, 2006, A new species of Exaerete Hoffmannsegg (Hymenoptera: Apidae: Euglossini) from Brazil, Zootaxa 1105, pp. 27-35 : 33-34

Key to the males of Exaerete Hoffmannsegg (Modified from Moure (1964) and Kimsey (1979))

1 Hypoepimeron with tubercle; labial palpi two­segmented ........................................ 2

­ Hypoepimeron without tubercle; labial palpi four­segmented ................................. 4

2(1) Frons without median tubercle ( Fig. 3 a); mesoscutellum with posterior margin convex ( Fig. 8 a) with a median longitudinal carina between two small sublateral tubercles ( Fig. 8 b); clypeus slightly rounded ( Fig. 3 b); hind femur not basally depressed, lower inner margin unarmed ( Fig. 13 b); hind tibial slit reaching apex of tibia ( Fig. 13 a); S7 medially elevated and truncate, covered with setae ( Fig. 18 a); S8 evenly rounded apically ( Fig. 18 b); gonostylus subtriangular, ventral half clothed with dense setae, dorsal half with scattered setae; gonocoxal lobe obtusely angulate ( Fig. 18 c); volsella ovoid, reduced ( Mexico to northern Argentina).................................... ............................................................................. E. smaragdina (Guérin­Méneville)

­ Frons with median tubercle ( Fig. 4 a); mesoscutellum with posterior margin convex ( Fig. 11 a) or straight; clypeus irregularly rounded ( Fig. 4 b), with or without prominence in profile ( Fig. 6 a); hind femur basally depressed, armed with emarginate crest, a large tooth ( Fig. 14 b) or elongate denticles ( Fig. 16 b); hind tibial slit very small ( Fig. 15 a) or reaching apex ( Fig. 16 a); S7 trilobed ( Fig. 19 a), bilobed ( Fig. 21 a) or without lobes ( Fig. 20 a); S8 lobed medially, with apicomedial point ( Fig. 20 b) or apically truncate ( Fig. 21 b); gonostylus not as above, either differently

shaped ( Fig. 20 c) or entirely clothed with dense setae ( Fig. 19 c); gonocoxal lobe not obtusely elongate ( Fig. 21 c); volsella ovoid, reduced ( Fig. 19 c) or well­developed ( Fig. 20 c) ................................................................................................................... 3 3(2) Mesoscutellum with two sublateral tubercles ( Fig. 9 a), posterior margin convex ( Fig. 9 b); clypeus irregularly rounded in profile ( Fig. 4 b); hind femur basally depressed, with large medial tooth on inner surface ( Fig. 14 b); S7 strongly trilobed with setae apically, median lobe strong ( Fig. 19 a); S8 apex slightly lobed medially ( Fig. 19 b); gonocoxal lobe sharply pointed ( Fig. 19 c) ( Mexico to Brazil) ................. .................................................................................... E. frontalis (Guérin­Méneville)

­ Mesoscutellum straight with a median longitudinal tubercle between two small sublateral tubercles; clypeus prominent in profile; hind femur slightly depressed basally; S7 trilobed, median lobe weak relative to lateral ones; S8 lobed medially; gonocoxal lobe obtusely angulate ( Brazil)............ E. lepeletieri Oliveira & Nemésio

4(1) Frons with median tubercle ( Fig. 5 a); mesoscutellum with posterior margin concave ( Fig. 10 a) or linear .................................................................................................... 5

­ Frons without median tubercle ( Fig. 6 a); mesoscutellum with posterior margin convex ( Fig. 11 b) or linear ( Fig. 12 a) ............................................................................. 6

5(4) Frons with strong median tubercle ( Fig. 5 a); mesoscutellum with concave posterior margin ( Fig. 10 a) and without punctures anteriorly; mesoscutellum with sublateral tubercles shining, conspicuous ( Fig. 10 b); hind femur with lower external border armed with a strong aculeate process followed by one or two small tubercles ( Fig. 15 b); S7 without lobes, apical margin with medial and sub lateral patches of setae and posterior row of setae ( Fig. 20 a); S8 with obtuse apicomedial angle ( Fig. 20 b); gonostylus parallel, clubbed apically; gonocoxal lobe evenly rounded ( Fig. 20 c) ( Costa Rica to northern Argentina).......................................... E. dentata (Linnaeus)

­ Frons with weak median tubercle; mesoscutellum with posterior margin linear; mesoscutellum with sub lateral tubercles densely punctured; hind femur lower external margin armed with a longitudinally emarginate crest; S7 without lobes, medially emarginated; S8 with strong apicomedial lobe; gonostylus laterally elongate and apically clubbed; gonocoxal lobe acutely angulate ( Mexico) ................ E. azteca Moure

6(4) Mesoscutellum with posterior margin convex ( Fig. 11 a); clypeus lacking vertical ridges ( Fig. 6 b); hind femur with multiple elongate denticles ( Fig. 16 b); S7 strongly bilobed, deeply incised medially, lobes truncate with long setae apically and transverse row of setae centrally ( Fig. 21 a); S8 apically truncate or slightly rounded ( Fig. 21 b); gonostylus with dense setae along ventral margin; gonocoxal lobe irregularly rounded ( Fig. 21 c); volsella ovoid, reduced ( Panama to Brazil) ................................ ............................................................................................... E. trochanterica (Friese)

­ Mesoscutellum with posterior margin linear ( Fig. 12 a); clypeus with carina forming a prominence in profile ( Fig. 7 b); hind femur with large tooth in basal half of inner margin ( Fig. 17 b); S7 bilobed, irregularly rounded and slightly depressed centrally,

Figures

FIGURES 1 – 17. 1. Lateral view of the body of Exaerete guaykuru, n. sp., holotype. The arrows indicate the hypoepimeron slightly convex, not tuberculate, and hind tibial slit reaching apex. Body length = ca. 26 mm. 2. Lateral view of the head of E. guaykuru, n. sp., paratype, showing the prominence on clypeus (arrow) and the metallic dark blue scape. Eye length = 4, 9 mm. 3 – 7. lateral view of head of male Exaerete spp. showing presence or absence of median tubercle (a) and prominence of clypeus (b); 3. E. smaragdina, 4. E. frontalis, 5. E. dentata, 6. E. trochanterica, 7. E. guaykuru, n. sp. 8 – 12. Mesoscutellum of male Exaerete spp. in dorsal (a) and posterior views (b), showing the shape of mesoscutellum and sub lateral tubercles. 8. E. smaragdina, 9. E. frontalis, 10. E. dentata, Fig. 11. E. trochanterica, Fig. 12. E. guaykuru, n. sp. 13 – 17. External surface of hind leg of male Exaerete spp. showing the hind tibial slit very small or complete (a), and the shape of the hind femur (b). 13. E. smaragdina, 14. E. frontalis, 15. E. dentata, 16. E. trochanterica, 17. E. guaykuru, n. sp.

FIGURES 18 – 23. 18 – 22. Male genitalia of Exaerete spp., showing the shape of S 7 (a), S 8 (b), and the lateral view of the genital capsule (c). 18. E. smaragdina, 19. E. frontalis, 20. E. dentata, 21. E. trochanterica, 22. E. guaykuru, n. sp. 23. Male genitalia of E. guaykuru, n. sp., digital images showing the shape of S 7 (a), S 8 (b), and the lateral view of the genital capsule (c).