Phase polymorphism is shown by

Phase polymorphism is shown by Grasshoppers.
Polymorphism is a discontinuous genetic variation resulting in the occurrence of several different forms or types of individuals among the members of a single species. A discontinuous genetic variation divides the individuals of a population into two or more sharply distinct forms.
The steppe grasshopper occurs in four distinct colour morphs that differ in the distribution of green across the dorsal and lateral sides of the body: uniform brown, dorsal green, lateral green, and uniform green. Colour and pattern polymorphism occurs in both sexes.