In this section
- Free-living caddis (Costachorema)
- Free-living caddis (Ecnomina)
- Free-living caddis (Edpercivalia)
- Free-living caddis (Hydrobiosella)
- Free-living caddis (Hydrobiosis)
- Free-living caddis (Hydrochorema)
- Free-living caddis (Neurochorema)
- Free-living caddis (Plectrocnemia)
- Free-living caddis (Polyplectropus)
- Free-living caddis (Psilochorema)
- Free-living caddis (Tiphobiosis)
- Free-living caddis (Zelandoptila)
- Net-building caddis (Aoteapsyche)
- Net-building caddis (Diplectrona)
Net-building caddis (Orthopsyche)
Hydropsychid caddis larvae have hardened (sclerotised) plates on each of the 3 thoracic segments, and gill tufts under the abdomen. Orthopsyche larvae have 6 sets of abdominal gills (7 in the related Aoteapsyche and Diplectrona). The Orthopsyche abdomen is also covered by coarse stubble (fine hairs in the other 2 genera). There are 4 anal gills at the end of the abdomen (5 anal gills in Diplectrona).
Orthopsyche larvae are most abundant in stony, bush-covered streams.
They construct filter-feeding nets attached to the streambed to trap drifting particulate food items, including algae and other invertebrates.
- Hard bottom: 9
- Soft bottom: 7.5
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 Orthopsyche larvae, particularly in combination with mayflies and stoneflies, is an indication of good water quality. They have high tolerance values of 9 (hard bottom sites) and 7.5 (soft bottom sites).