Meliponini, Lepeletier de Saint Fargeau, 1836

Engel, Michael S., Herhold, Hollister W., Davis, Steven R., Wang, Bo & Thomas, Jennifer C., 2021, Stingless bees in Miocene amber of southeastern China (Hymenoptera: Apidae), Journal of Melittology 2021 (105), pp. 1-83 : 20

Key to Genera of Meliponini in Zhangpu Amber

(worker caste)

1. Retrolateral surface of metabasitarsus with basal sericeous area ( Fig. 41 ); retrolateral surface of metatibia with keirotrichiate zone separated from apical margin by distinct apical glabrate zone and from retrodorsal margin by well-developed superior glabrate zone, at its widest about 0.5× width of keirotrichiate zone ( Fig. 41 ); clivulus demarcating keirotrichate zone a distinct ridge; malar space linear; fringe of bristles on retromarginal edge of metatibia plumose ( Fig. 42 ); yellow maculation lacking from mesoscutum and mesoscutellum ....... ......................................................................................................... Tetragonula Moure

—. Retrolateral surface of metabasitarsus without basal sericeous area ( Figs. 59, 60 ); retrolateral surface of metatibia with keirotrichiate zone extending to apical margin and separated from retrodorsal margin by narrow superior glabrate zone, much narrower than 0.5× width of keirotrichiate zone ( Figs. 59, 60 ); clivulus virtually absent, indistinct, keirotrichate zone gradually and shallowly sloping into superior glabrate zone ( Fig. 58 ); malar space distinct, not linear ( Fig. 54 ); fringe of bristles on retromarginal edge of metatibia simple ( Fig. 60 ); yellow maculation present on mesoscutum and mesoscutellum (sometimes difficult to observe in fossils depending on preservation) ( Figs. 52, 53 , 55 ) ............... ....................................................................................................... Austroplebeia Moure

Figures

Figures 40–42. Leg details of workers of Tetragonula (Tetragonula) florilega, new species. 40. Prolateral view of metatibia and metabasitarsus (NIGP 176111). 41. Retrolateral view of metatibia and metatarsus (NIGP 176118). 42. Detail of plumose retromarginal setal fringe along metatibia (NIGP 176111).

Figures 59–62. Details of workers of Austroplebeia (Anteplebeina) fujianica, new species. 59. Ret- rolateral view of metatibia and metatarsus of SEMC F002513. 60. Retrolateral view of metatibia and metatarsus of NIGP 176057. 61. Left view of head and mesoscutal dorsum of NIGP 176057. 62. Forewing of NIGP 176057.

Figures 54–58. Worker (holotype, NIGP 176057) of Austroplebeia (Anteplebeina) fujianica, new species, µCT scans (yellow highlights indicate areas of yellow maculation; green indicates area of keirotrichiate zone). 54. Facial view (note malar space in relation to diameter of flagellomeres II + III). 55. Dorsal habitus. 56. Prolateral view of metatibia and metatarsus. 57. Retrolateral view of metatibia and metatarsus. 58. Cross-section of metatibia showing gently sloping clivulus.

Figures 52–53. Mesosomal details of workers of Austroplebeia (Anteplebeina) fujianica, new species (note also finely polished reticulate propodeal sculpturing in both specimens). 52. Posterior-dorsal-oblique view of NIGP 176057 (holotype). 53. Posterior-dorsal-oblique view of SEMC F002513.