Abstract
The social aphid Pseudoregma bambucicola can produce morphologically and behaviorally specialized sterile soldiers and reproductively normal nymphs, and represents a good model system for studying social evolution. The cover photo shows a colony of this species on bamboo, in which several parthenogenetic viviparous mothers are producing offspring. Remarkable reproductive plasticity in parthenogenetic mothers and a novel strategy of regulating caste ratio via maternal reproductive differentiation were found in this social hemipteran (see pages 582‐586). Photo provided by Xiaolei Huang.
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