Short answer
A nymph is the immature stage of an insect with incomplete metamorphosis, such as a grasshopper. A larva is the immature stage in complete metamorphosis, such as a caterpillar. Nymphs usually resemble adults more than larvae do; the complete pathway has a distinct pupa stage. 1 2
Both are immature stages, but they occur in different developmental patterns.
On this page
At a glance
Scroll to compare all columns →
| Question | Nymph | Larva |
|---|---|---|
| Typical sequence | Egg → nymph → adult | Egg → larva → pupa → adult |
| Adult resemblance | Often recognizable body plan | Often substantially different |
| Pupa stage | Absent | Present |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Nymph. An immature stage in an insect life cycle with incomplete metamorphosis, often resembling a smaller adult. 1
Larva. An immature feeding stage in a life cycle with complete metamorphosis, generally unlike the adult form. 2
Key differences
Nymphs grow through molts toward an adult body plan. Larvae also grow and molt, but their transformation into adults passes through a pupal stage. The words label a life-cycle role, not a reliable visual shape by themselves. 1 2
How to tell them apart
Identify the insect and its development pattern. A young grasshopper with developing wing pads is a nymph; a butterfly caterpillar is a larva. Do not classify an unknown insect solely by size or the fact that it lacks wings. 1 2
Where they overlap
Both eat, grow and shed an outer covering as they develop. In either case, the immature stage may occupy a different habitat or use different food than the adult. 1 2
Edge cases
Some insects have unusual development and everyday writing may call many juvenile animals larvae. Aquatic young of dragonflies are nymphs even though they look quite different from flying adults. 1 2
Why the distinction exists
Entomologists distinguish the two because complete and incomplete metamorphosis organize growth differently, which also matters when identifying pests or conservation stages. 1 2
Common misconceptions
A nymph is not a baby larva waiting to become a pupa. Nor is every small insect a nymph. 1 2
Examples
A young bed bug is a nymph. A mosquito wriggler is a larva before its pupal stage. 1 2
Sources
Sources checked October 3, 2026.
- Purdue Extension — Understanding Insect Metamorphosis. Complete and incomplete metamorphosis.
- Penn State Extension — Morphing with Bugs. Life cycles and molting.