Definition

Noun: A small, moth-like insect belonging to the order Trichoptera. Adult caddis flies are characterized by having two pairs of hairy, membranous wings that are held roof-like over the body when at rest. They are most notable for their aquatic larval stage, during which many species build protective cases from silk and materials like sand, twigs, or leaves.

Usage

The term "caddis fly" refers specifically to the adult insect of this order. It is used in entomology, ecology, and fishing contexts. - The health of the river can be assessed by the diversity of caddis fly species present. - Anglers often use artificial flies that mimic the caddis fly to catch trout.

Examples

• Scientific Context:
  • The biologist studied the life cycle of the caddis fly from larva to adult.
• Recreational Context:
  • A hatch of caddis flies on the water's surface is a exciting sight for fly fishermen.

Advanced Usage

• Indicator Species: In environmental science, the presence or absence of caddis fly larvae is used as a bioindicator for water quality.
  • The stream was found to be polluted, as evidenced by the absence of caddis fly larvae.

Variants and Related Words

• Caddis (noun): A common shortened form for "caddis fly," especially among anglers.
  • The trout were rising to take the emerging caddis.
• Caddisworm (noun): Refers specifically to the aquatic larval stage.
  • The caddisworm constructed its case from tiny pebbles.

Synonyms

• Sedge fly (noun): A synonym commonly used in British English, particularly in fly-fishing.
  • He tied a pattern designed to imitate a sedge fly.

Related Terms (Not Phrasal Verbs or Idioms)

• Trichoptera (noun): The scientific order name for caddis flies.
• Case-building (adjective/noun): Describes the behavior of many caddisfly larvae.
  • The case-building larvae are a fascinating subject of study.

Noun

1. small moth-like insect having two pairs of hairy membranous wings and aquatic larvae