Contrasting patterns of ovarian development and oogenesis in two sympatric host-feeding parasitoids, Diglyphus isaea and Neochrysocharis formosa (Hymenoptera: Eulophidae)

摘要: Diglyphus isaea (Walker) and Neochrysocharis formosa (Westwood) (Hymenoptera: Eulophidae) are common idiobiont parasitoids of leafminers attacking vegetable crops. They exhibit differing levels synovigeny, host feeding enhances their fecundity longevity. The reproductive systems these two typical hymenopteran eulophids, consisting ovaries, each usually comprising three polytrophic meroistic ovarioles. possesses obvious oviduct accessory glands, which absent in N. formosa. Both underwent oosorption when starved, while on larvae promoted oogenesis egg maturation. In both, vitellogenesis commenced the first day pupal stage rather than after eclosion. Formation ovarioles D. 1 earlier Mature eggs were rarely observed ovaries newly emerged isaea, but a few present When hosts (second–third instar Liriomyza sativae larvae) provided, number mature initially increased then stabilized, formosa, decreased. had fewer larger did. Thus, synovigenic divergence begins at may result different life-history traits adults.