Common collecting methods include netting, light trapping, and underwater bottle-trapping. Size: Size of the adult diving beetles varies from 2 mm to 45 mm. Two conspecific and similarly sized larvae were captured by the Field Methods Class seining on Tuesday in the pond; occupying the same dish for 24 hours resulted in a 50% drop in the population. Fun Facts - Although larval diving beetles have gills, the adults do not. With respect to localities 1 and 2, a key element of the spring and seepage habitat was that it flowed out of the river banks at about the level of the high water (vernal flood) mark. 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. The larvae can reach 8 cm, and lack cerci (paired, sometimes pincerlike appendages) on their posterior end. The adults of most are between 1 and 2.5 cm long, though much variation is seen between species. Beetle Habitat. However, if they are out of the water for too long, they become somewhat waterproof. All Canadian species of predaceous diving beetles are herein assessed for the first time in the Wild Species series. The hind legs are flattened like paddles and have stiff hairs that increase the … They are common in temporary pools, wetlands, marshes, ponds and slow sections of flowing waters. Predaceous diving beetles are highly adapted for aquatic life, and with more than 4000 species, is the most diverse water beetle family (Figures 12 and 13). Whirligig beetle, (family Gyrinidae), any of about 700 species of beetles (insect order Coleoptera) that are widespread throughout the world and are usually seen in groups, spinning and whirling around on the surfaces of quiet ponds or lakes.Whirligig beetles prey on insects and other creatures that fall on the water surface. This diving beetle larvae is a fierce little predator. Size - 0.5 in. The Dytiscidae – based on the Greek dytikos, "able to dive" – are the predaceous diving beetles, a family of water beetles. predaceous diving beetle (Coleoptera: Dytiscidae) community composition in 20 seasonal wetlands, half with and half without sphagnum moss (Sphagnum spp.). There are several common species of predaceous diving beetles in Kentucky, but most are very similar in appearance and only experts can distinguish between them. Typically, they live in the shallow, still waters of lakes and ponds or in the pool areas of streams. The larvae are large, fearsome-looking beasts, with big, biting jaws: they look a bit like pale brown, underwater Devil's Coach Horses. Instead, adults breathe underwater by bringing a small bubble of air with them when they dive. Both the beetles and the larvae breathe air. 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