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The high variability in the reproductive biology of stingless bees makes them very amenable for comparative studies with other eusocial bee taxa. We investigated the structural organization of the ovaries of Melipona quadrifasciata queens and workers kept under different social conditions by analyzing their general histology, mitotic activity, and microfilament organization. The overall dynamics of ovarian activity were similar in the two castes, and at emergence their ovarioles contained a previtellogenic follicle. Stingless bees and honey bees differ in the structural organization in the lower germarium, but they have in common synchronized mitotic activity and putative germ line stem cells in the terminal filament. Unlike honey bees, stingless bee workers lay trophic eggs in addition to reproductive eggs. The overall similarities in oogenesis between the two taxa suggest that the decision to form trophic eggs should only occur in the late stages of oogenesis.Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[99/00719-6]Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[02/11729-7]Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES

apidologie

Ovariole structure and oogenesis in queens and workers of the stingless bee<i>Melipona quadrifasciata</i>(Hymenoptera: Apidae, Meliponini) kept under different social conditions

Ovariole structure and oogenesis in queens and workers of the stingless beeMelipona quadrifasciata(Hymenoptera: Apidae, Meliponini) kept under different social conditions