I General Biology of Aphides 1,Polymorphism(多型多态现象) Generally,5 or 6 different types of appearances in each species. l)Fundatrix(干母)：Vingless or winged,but most are winged;hatched from zygote. 2)Fundatrigenia(干雌)：Offspring of fundatrix;most are wingless on overwinter hosts. Ⅰ. General Biology of Aphides 1. Polymorphism (多型多态现象) Generally, 5 or 6 different types of appearances in each species. 1) Fundatrix (干母): Wingless or winged, but most are winged; hatched from zygote. 2) Fundatrigenia (干雌): Offspring of fundatrix; most are wingless on overwinter hosts