Figure 1.

Life cycle of the pea aphid, A. pisum. During the spring and summer reproduction is by parthenogenesis. Asexually-produced embryos develop in approximately 10 days. In the fall there is a single generation of sexually-reproducing males and females which produce diapausing eggs. These eggs do not hatch until the following spring, more than 100 days later.

Shingleton et al. BMC Developmental Biology 2003 3:7   doi:10.1186/1471-213X-3-7
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