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Smooth cased caddis (Beraeoptera)

Taxonomic group

Conoesucidae: Beraeoptera

Diagnostic features

Beraeoptera caddis larvae construct a mobile case that is largely or entirely uncovered by sand grains. The aperture (opening) is strongly oblique and widens laterally (unlike the other smooth cased caddisflies Olinga and Confluens).

Typical habitats

Beraeoptera larvae are most common in stony, bush-covered streams.


They are “collector-gatherers”, feeding on a range of organic matter accumulating on stream beds.

Indicator value

  • Hard bottom: 8
  • Soft bottom: 7

The tolerance values (ranging from 0 to 10) give an indication of which are the sensitive taxa (values of 8 or more) and which are the tolerant taxa (values of 3 or less). For more information see: Indicator species

An abundance of Beraeoptera larvae indicates good habitat and water quality conditions, especially if mayfly or stonefly groups are also abundant. They have tolerance values of 8 (hard bottom sites) and 7 (soft bottom sites).