1. The caterpillar formed a pupal casing before transforming into a butterfly.
2. The scientist observed the pupal stage of the beetle's life cycle under a microscope.
3. The pupal development of the mosquito takes place in water before emerging as an adult.
4. The entomologist studied the pupal exuviae left behind by the emerging mayfly.
5. The pupal stage of the ant lasts for several weeks before it becomes an adult.
6. The pupal skin of the dragonfly was found clinging to a reed by the pond.
7. The pupal cocoon of the moth was carefully preserved for display in the museum.
8. The pupal transition of the bee from larva to adult is a fascinating process.
9. The pupal stage of the fruit fly is crucial for understanding its genetics and development.
10. The pupal behavior of the wasp was observed closely by the researcher in the field.