【目的】 研究幼期薜荔传粉榕小蜂Wiebesia pumilae (Hill) Wiebes及其与虫瘿的协同发育，为寄生蜂发育生物学研究提供理论依据。【方法】 在近百日的薜荔榕小蜂幼期发育过程中，每间隔3 d采集5个已被产卵的薜荔榕果，分别测量果径、虫瘿层高、虫瘿直径和榕小蜂体长，观测蜂-瘿协同发育动态。【结果】 薜荔传粉榕小蜂的幼虫期分为5龄，无法分辨雌雄，且形态特征没有明显分化，不同龄期幼虫的体长差异显著（P<0.05）。幼虫结构包括体壁（白色）、体节、口器、中肠（黄色）。蛹期分为前期蛹、中期蛹和后期蛹3个阶段，雌雄蛹期异形分化明显，复眼最早呈现色彩，雄蛹发育早于雌蛹1-3 d。虫瘿由表皮层、保护层、内皮层、营养层和瘿室组成，首次发现在卵孵化期坚硬的珠心组织快速转化成由薄壁细胞组成的营养组织，幼虫以营养组织分泌的营养液为食，而非直接啃食植物组织。榕小蜂幼虫体长和虫瘿直径在榕小蜂发育幼虫期均呈双S型曲线增长，虫瘿增长先于幼虫体长增长。虫瘿层高度和薜荔果径在幼虫期和蛹期的发育过程中保持持续增长趋势，为榕小蜂发育提供生长空间。【结论】 本研究明确了薜荔传粉榕小蜂各虫态的形态特征，以及幼虫与虫瘿间的营养联结与协同发育动态。

[Objectives]  The developmental dynamics of young Wiebesia pumilae (Hill) Wiebes fig wasps and the galls they live in was investigated. [Methods]  During the c. 100 day developmental period of young fig-wasps, five figs on which wasp eggs had been laid were collected every three days, and their diameter, gall layer height, gall diameter, and wasps’ body length, measured. [Results]  Although larvae of different ages did not differ obviously in morphology, larvae could be divided into 5 instars on the basis of body length, which was significantly different among different instars (P<0.05). Larval body parts include the body wall (white), body segments, mouthparts and midgut (yellow). Three pupal stages were identified; primary, intermediate and mature. Male and female pupae were heteromorphic and male pupae developed 1-3 days earlier than female pupae. The compound eyes of pupae were the first to change color. Galls consist of epidermis, protective layer, endodermis, nutritive tissue and the gall chamber. The hard gall nucellus rapidly changed into soft nutritious tissue comprised of parenchyma cells when wasp eggs were hatching, and wasp larvae feed on the nutritious solution secreted by this tissue rather than damaging other plant tissues. Both the body length of larvae and gall diameter conformed to a double S growth curve with the gall growing faster than the larvae. The gall layer height and fig diameter continued to grow during the larval and pupal stages, so that there was always sufficient space for wasps to develop. [Conclusion]  Larvae of the fig wasp W. pumilae can be divided into 5 instars on the basis of body length and coevolution has led to symbiosis between their development and growth and that of fig galls.