What characteristic distinguishes a nymph from a larva?

Nymphs and larvae represent different developmental stages in the life cycles of insects, and one key distinction is that nymphs do not undergo a pupal stage. Insects that develop through a process called incomplete metamorphosis, such as grasshoppers and cockroaches, go from egg to nymph to adult without forming a distinct pupal stage. Nymphs resemble smaller versions of the adult insects and gradually mature by molting.

In contrast, larvae are associated with insects that undergo complete metamorphosis, such as butterflies and beetles. These insects transition from egg to larva to pupa and then to adult. The larval stage is often significantly different in form and function from the adult stage, and the pupal stage serves as a transformative phase between larvae and adults.

Recognizing that nymphs skip the pupal stage is crucial for understanding the life cycles of various insect groups and can influence how pest control strategies are designed since it affects the timing and method of intervention. This understanding helps in accurately identifying the developmental stages of insects when addressing pest management in agricultural and structural settings.