The latter surface for air head first and have a ridge or keel on the underside that runs down the thorax and extends into a point. As their name implies, these beetles are predatory. B oth adult diving beetles and the larvae (the "water tigers") can bite people, but their bites do not usually hurt people or make them sick. Good decision... their "bite" injects digestive juices, like many other beetles and bugs such as the assassin bug, digesting their prey within its body before sucking the nutrition out of them. It is a voracious predator, hunting smaller invertebrates, tadpoles and even small fish. We've nicknamed the bug you see above, the predacious diving beetle, "zippity." Barb immediately identified them as predaceous diving beetles (PDB). Life History: • Primarily found in shallow, weedy, still water • … Predaceous diving beetles are easily confused with water scavenger beetles (Coleoptera: Hydrophilidae). They don’t hesitate to attack prey larger than themselves, delivering a sharp bite with their jaws to small fish, tadpoles and frogs. 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). However, if there are too many diving beetles in a pond or lake, they reduce the number of fist that live there because they eat the baby fist (baby fish are called "fry"). It’s been a while since I’ve done an identification post, so it’s time for a new one! The predaceous diving beetles are called Dytiscidae. They eat a variety of aquatic prey like other insect larvae and naiads. • Body hardened and convex on top and bottom (Water scavenger beetles are concave on bottom) • Often rest hanging into water with tip of abdomen at surface • 2 long antennae • Short finger-like mouth parts, not visible from above. The meaning is able to dive. The name was derived from a Greek word. Life Cycle: Adults and larvae are found in water. Predaceous Diving Beetles are also called water tigers. There is a family of water beetles, Dytiscidae, known as Predaceous Diving Beetles. The predacious diving beetle is a seldom seen but very common aquatic insect. However; you can see variations of length among the species of diving beetles. Common name(s): Predacious Diving Beetle. 25 come in each pack. It is oval shaped and small. In fact, there are over 500 in North America and over 5,000 worldwide. However, this group has historically received little scientific attention to its systematics or its ecology within the aquatic invertebrate community. With the name predaceous, I decided they weren't to be handled. The Great diving beetle is a very large diving beetle that can be found in ponds and slow-moving water. On average, it has the length of 1 inch or 25 mm. Diving Beetle resin replica measures 2" long x 1.25" wide. Predaceous diving beetles (Dytiscidae) are a moderately speciose family within the most speciose order of insects (Coleoptera). Predacious Diving Beetles (a type of water beetle) are encrusted in hard dirt are ready to be excavated and discovered by young paleontologists. Dytiscidae – based on the Greek dytikos "able to dive" are the predaceous diving beetles, a family of water beetles. This species has feathery legs that help it navigate through water. 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