Subscribe 30 Share. Giant Predaceous Diving Beetle eat fish. Image courtesy of Brad from WI. Predaceous Diving Beetle Larvae. The next time you're standing on a dock and the water is calm, be very still and watch the water around the weeds. Their sharp jaws inject enzymes that digest their prey so that the juices can be ingested by the beetle. Ollegish Published April 13, 2016 2,900 Views $1.55 earned. Evolutionary Biology Graduate Student Workshop, http://dnr.wi.gov/org/caer/ce/eek/critter/watercritter/divingbeetle.htm. Description: Predaceous Diving Beetles swimming and floating. There is a family of water beetles, Dytiscidae, known as Predaceous Diving Beetles. This diving beetle larvae is a fierce little predator. A Predaceous Diving Beetle feeds on other aquatic insects and creatures, including small tadpoles. It’s been a while since I’ve done an identification post, so it’s time for a new one! The larvae are large, fearsome-looking beasts, with big, biting jaws: they look a … Charlottesville, VA 22904. Species also include copepods, phantom midge larvae, banded sunfish, wood frog, and painted turtle. Today I’m going to focus on two aquatic beetle groups that a lot of people have a hard time telling apart from one another: the predaceous diving beetles (family Dytiscidae, the dytiscids) and the water scavenger beetles (family Hydrophilidae, the hydrophilids). They've got two long pincers and can inflict a painful bite. Adults are often black or dark reddish, although some species are brilliantly colored or iridescent. Predaceous Diving Beetle Pictures Below are images of the Predaceous Diving Beetle. But don't blink, because they are fast. The larvae take in air and store it in their tracheal trunk (windpipe), returning to the surface when they need more. The larvae hunt by holding still, waiting with jaws wide open, and then strike suddenly, clutching the prey tightly with their jaws. Black light traps are commonly used by entomologists and work well for collecting some beetles, but aren’t required. 485 McCormick Road If they try to reenter the water after this happens, they may become trapped on the surface, unable to break the surface tension. This diving beetle larvae is a fierce little predator. PO Box 400327 They occur in virtually any freshwater habitat around the world, but a few species live among leaf litter. Aquatic beetles in the beetle family Dytiscidae are known as predaceous diving beetles. Predaceous diving beetles are in the Family Dytiscidae (from the Greek for “able to dive”); with 4300 species worldwide (about 500 in North America), they are the largest family of aquatic beetles. Menu. There are around 4,000 species of diving beetles. Both the beetles and the larvae breathe air. It may look like it only has two front legs, but its other 4 legs are underneath it, out of sight. However, their joints are arranged in such a way that, while they are powerful swimmers, they are helpless on land. Dried Predaceous Diving Beetle is great for science Olympiad bug collection. Instead, adults breathe underwater by bringing a small bubble of air with them when they dive. Their shape and color varies greatly. The largest predaceous diving beetles are most easily captured with baited minnow traps, but be sure to keep part of the trap above the water so that beetles can breathe. Click on the thumbnails to enlarge the images or return to the article. Thursday, July 15, 2010. In addition to cannibalism, these larvae also consume insects, snails, tadpoles, and fish. Image courtesy of Touria B.. VIEW IMAGE. The beetles have powerful, fringed hind legs that they move together to propel them through the water. 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