1. A small to medium-sized insect with four wings and aquatic larvae that typically build protective cases from silk and plant material.
Usage: Also called caddis fly or caddis.; The larval stage is important in freshwater ecosystems and fly fishing.

Examples

• Caddisflies are common near streams and rivers throughout North America.
• The larva of a caddisfly constructs a case from sand grains and plant debris.
• Fly fishers often use caddisfly imitations as bait because trout feed on them.
• Adult caddisflies emerge from the water in the evening and are attracted to lights.
• The presence of caddisflies indicates good water quality in a stream.
• Caddisfly larvae are an important food source for freshwater fish.