In this section
- Alligator weed flea beetle (Agasciles)
- Diving beetle (Antiporus)
- Diving beetle (Hyphydrus)
- Diving beetle (Liodessus)
- Diving beetle (Onychohydrus)
- Diving beetle (Rhantus)
- Marsh beetles (Scirtidae)
- Riffle beetles (Elmidae)
Toe-winged beetles (Ptilodactylidae)
- Water scavenger beetle (Berosus)
- Water scavenger beetle (Hydrophilidae)
- Whirlygig beetle (Gyrinus)
Ptilodactylids are beetles with long, mealworm-like larvae that live in streams, but the adults are terrestrial. The larvae have a similar body form to the elmids, but ptilodactylids are usually larger and more orange-brown than elmids. The last (9th) abdominal segment has a flat upper surface, which is not the case in the elmids.
Ptilodactylids can be common in some slow flowing bush covered streams.
Ptilodactylid larvae are likely to be “collector-gatherers” feeding on a range of fine organic matter trapped amongst, or growing on the streambed.
- Hard bottom: 8
- Soft bottom: 7.1
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
Ptilodactylids are usually found in streams with moderate to good water quality. They have tolerance values of 8 (hard bottom sites) and 7.1 (soft bottom sites).