What is the term for the complete lifecycle progression that includes stages of egg, larva, pupa, and adult?

The term that describes the complete lifecycle progression consisting of distinct stages of egg, larva, pupa, and adult is complete metamorphosis. This process is characterized by a significant transformation during the lifecycle of certain insects and other organisms.

During complete metamorphosis, the organism undergoes a dramatic change from a juvenile stage (larva) to a more developed adult stage. The larva typically looks completely different from the adult and has a different ecological role, sometimes even feeding differently. The pupa stage serves as a transformative phase where the larva develops into its adult form. This comprehensive transition allows for specialization at each stage, often leading to greater survival and reproductive success.

The other terms refer to different developmental strategies. Rapid metamorphosis may describe quick changes but does not encapsulate the full lifecycle stages detailed in this question. Incomplete metamorphosis involves fewer stages, typically consisting of egg, nymph, and adult, so it lacks the pupal stage. Simple metamorphosis is not a commonly recognized term in the context of lifecycle developments among insects. Thus, complete metamorphosis is the most accurate term for the lifecycle described.