1. Amphibians:
- Egg (aquatic)
- Larva (aquatic)
- Metamorphosis into adult (semi-aquatic or terrestrial)
- Adult (semi-aquatic or terrestrial)
2. Insects:
- Egg
- Larva (caterpillar, maggot, nymph)
- Pupa (cocoon or chrysalis)
- Adult (winged)
3. Jellyfish:
- Polyp (attached to a surface)
- Medusa (free-swimming)
- Polyp (attached to a surface)
- Medusa (free-swimming)
4. Some Flatworms:
- Egg
- Ciliated larva (swimming)
- Metamorphosis into adult (free-living or parasitic)
- Adult (parasitic or free-living)
5. Sea Urchins and Starfish:
- Egg (planktonic)
- Larva (bipinnaria or brachiolaria)
- Metamorphosis into young sea urchin or starfish
- Adult sea urchin or starfish
6. Certain Cnidarians:
- Egg (planktonic)
- Planula larva (motile)
- Polyp (attached to a surface)
- Medusa (free-swimming)
These animals undergo distinct stages in their life cycles, with each stage having its own unique characteristics and functions.