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)
Rhantus is one of the dytiscid “diving beetles” having larvae and adults that are active swimmers. The larvae lack any nose-like projection, and they have two tail-like cerci that are about as long as the last abdominal segment. The adults are oval and streamlined, 8 to 12mm long, with 11-segmented antennae, and the wing covers are mottled brown (lacking the strong stripes of Lancetes).
Rhantus are most likely to be found in weedy ponds, and slow-flowing streams.
The dytiscid beetles are predators, feeding on other pond invertebrates.
- Hard bottom: 5
- Soft bottom: 1.0
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
The presence of Rhantus is more likely to reflect pond-like habitat conditions rather than any particular water quality conditions. They have medium to low tolerance values of 5 (hard bottom sites) and 1.0 (soft bottom sites).