It is a voracious predator, hunting smaller invertebrates, tadpoles and even small fish.

These are water beetles that normally live on the surface of the water. Great Diving Beetle, Dytiscus spp. A water beetle is a generalized name for any beetle that is adapted to living in water at any point in its life cycle. Many have aquatic larvae and terrestrial adults.Beetles that are aquatic in all life stages include ‘Whirligig Beetles’ (Gyrinidae). They often have closed mouth openings and use channels in their large (sickle-like) mandibles to inject digestive enzymes into the prey.

Many dytiscid larvae have a pair of caudal filaments, which help to break the water tension.Larvae have elongated body and can be distinguished by the presence of sclerotized head, distinct neck, three pairs of segmented legs and prominent mandibles. In general, the body is more streamlined in shape and flattened (compared to terrestrial beetles). Other four legs are trucked into grooves along the sides to preserve streamlined body shape. Larvae lack wing pads, prolegs and outgrowing tracheal gills.

The hairy fringes spread out on the power stroke, which increase the surface area.

Adult beetles overwinter and do not mate and lay eggs until the next spring.– Characteristically clubbed antennae, which are mostly composed under the head.– Hydrophilids have more convex top and more flattened bottom of the body.– Presence of thin layer of air on the bottom of the body.– Most species have a conspicuous, sharp pointed keel between the legs.– Hydrophilids perform alternating movement of legs (diving beetles swim simultaneously).– To replenish the air supply, water scavenger beetles break the water tension head first (diving beetles use the tip of abdomen).In general, water scavenger beetles feed on decaying organic matter, but eat considerable amount of living invertebrates as well. The antennae are short, as are the legs.Types in which the adults are not necessarily aquatic include:Hydrophilidae – a family of mainly aquatic beetles notable for their long maxillary palpi, which are longer than their antennae.Lutrochidae – a family of water beetles sometimes known as ‘Travertine beetles’, since in North America they are common in springs and streams depositing travertine – a sedimentary rock.Heteroceridae – mud-loving beetles that are widespread and a relatively common family of beetles. The water beetles comprise approximately 14 families: There are 283 (Denton 2007) species in the UK although the exact number is contentious as some families have purely terrestrial species in them and some leaf beetles or weevils may or may not be included. Water beetles are one of the most diverse groups in freshwater – in Britain there are around 350 species – but because they are the Little Brown Jobs of the freshwater world many people don’t realise quite how many different types there are. Water beetles rise to the water surface and take atmospheric air into their tracheal systems. Transformation into adult takes few weeks and adult stays within the cavity some additional time as the skin hardens. Note: the family Carabidae (ground beetles), is also part of this suborder; a list of these is at List of ground beetle (Carabidae) species recorded in Britain.

They get their common name from their habit of swimming rapidly in circles when alarmed and are also notable for their divided eyes which can see both above and below water.Haliplidae – a family of water beetles who swim poorly using an alternate motion of the legs and therefore prefer to get around by crawling.Noteridae – a family of beetles relatively small, ranging from 1 to 5 millimetres, with smooth oval bodies ranging from light brown to a darker reddish brown.Amphizoidae – Trout-Stream beetles found in high mountain streams, although other species occur at lower elevation.Dytiscidae – (able to dive) are known by various common names around the world, including predaceous diving beetles, water beetles and diving beetles).

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