The ground beetles. Commonly seen across the continental US, this beetle has the widest distribution in the genus Hydrophilus (Short and McIntosh 2014). FAMILY HYBOSORIDAE (Scavenger Scarab Beetles) Hybosorus illigeri Hybosorus illigeri Hybosorus illigeri ... Ochthebius Ochthebius Ochthebius FAMILY HYDROPHILIDAE (Water Scavenger Beetles) Browse here. Even their larvae are omnivores, eating small insects, detritus, and other debris in the water. Top Left: Water Penny Larva(Family Psephenidae) Bottom Left: Adult Predacious Diving Beetle (Family Dytiscidae) Right: Water Scavenger Beetle Larva (Family Hydrophilidae) Source: Photos taken from The North American Benthological Society. A case may hold 100+ eggs at the start, but cannibalism reduces the number of larvae that live to exit. Water Scavenger Beetles are predators and some eat mosquito larvae, naturally reducing the size of summertime mosquito populations. Larvae often predatory. According to Eaton and Kaufman, in the Field Guide to Insects of North America, some species of WSB can squeak by rubbing their abdomen against the underside of the wing covers. Size: Approximately 40 mm Habitat: Usually found in ponds, shallow lakes, and along the shoreline of flowing water. While a PDB breathes by backing its rear end up to the water’s surface, a WSB breaks through the surface film with its “un-wet-able” antennae, which form a funnel through which air is transported. Habitats discussed in detail in. At 0.25 mm in length it is some 16 million times smaller in volume than the largest beetle, Goliathus giganteus (family Scarabaeidae), which may have a body length up to 10 cm. Commonly referred to as the giant water scavenger beetles, the lineage includes some of the largest aquatic beetles in the world with some exceeding five cen-timetres in length. Some have a conspicuous ridge on the underside of the thorax. Class Insecta (Insects) Order Coleoptera (Beetles) Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles) No Taxon (Series Staphyliniformia) Superfamily Hydrophiloidea (Water Scavenger and Clown Beetles) Family Hydrophilidae (Water Scavenger Beetles) Synonyms and other taxonomic changes. 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). Water scavenger beetles (family Hydrophilidae) are primarily tropical aquatic beetles. Its nick-name—silver-beetle—is a nod to the film of air bubbles that typically covers its flat ventral surface. Image 20 (adult - 10 mm) East Fork Lewis River Lewisville Park . The giant black water beetle (Hydrophilus triangularis) (Figure 1) is the largest aquatic-dwelling beetle in not only Florida, but in the entire United States (Epler 2010). Order - Beetles - Coleoptera. They are, in turn, eaten by fish and targeted by many parasites. The smallest beetle is the fringed ant beetle, Nanosella fungi (family Ptiliidae). We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. Phylum - Insects, Springtails, Millipedes - Mandibulata. Everything else copyright © 2003-2020 Iowa State University, unless otherwise noted. When the wings are closed, the elytra create a line straight down the back. They are, in turn, eaten by fish and targeted by many parasites. Some terrestrial species feed on various decaying matter and associated maggots. Swimming involves alternate strokes (left-right-left-right) of their flattened, hairy, second and third pairs of legs, in contrast to the PDB’s oar-like strokes. The predatory great diving beetle eats the tadpoles, worms and sometimes the smaller fishes. Movement: The adults come up for air head first, and move hind legs alternately (Dysticidae come up for air tail first and move hind legs together, like oars), Mostly aquatic; Sphaeridiinae are terrestrial (in dung, compost, carrion, and other decaying organic matter). The water scavenger beetle has triangular yellow markings on the sides of the abdomen and usually swims near the bottom of shallow pools. Aquatic hydrophilids are notable for their long maxillary palps, which are longer than their antennae. mon and recognizable members of the water beetle family Hydrophilidae. 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