Dytiscidae Necterosoma penicillatus
Necterosoma penicillatus is a predatory diving beetle endemic to southern Australia. The adults are able to tolerate extremes of salinity and have been collected in salinities of 130 ppt (over 3 times saltier than the sea), however the larvae require lower salinities to survive. The larvae have long swimming hairs on their legs and feed on their prey by piercing then pumping into them digestive juices with their long mandibles. They then suck up the liquefied food. The adults have long fringes of hair on their hind legs which act as paddles. They feed on their prey by pulling them apart with their strong fore legs and mandibles.