Image 20 (adult - 10 mm) East Fork Lewis River Lewisville Park . The oval whirligig beetle has brownish yellow legs and often swim in circles. WSB larvae are described as “sluggish” and are found crawling on the pond floor or climbing on underwater vegetation. Indeed, the two share classification in the beetle Order Coleoptera. The usually-black WSBs have a more “domed” shape than the usually-black PDBs, and their flat, ventral surfaces often sport a keel. Aquatic hydrophilids are notable for their long maxillary palps, which are longer than their antennae. Adult: Family Carabidae. 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. (ed.) Phylum - Insects, Springtails, Millipedes - Mandibulata. Kingdom - Animals - Animalia. Order Coleoptera - Family List Go to: Adult Larvae. Larvae often predatory. Specifically, the water scavenger beetle has many calls including stress calls, a male courtship call, a male copulating sound, and a female rejection buzz. Larvae back their abdomen up to the water’s surface and take in air through spiracles (pores) at its tip. 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. 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). WSB larvae often have paired, gill-like structures protruding from the sides of their abdomens. FAMILY HYBOSORIDAE (Scavenger Scarab Beetles) Hybosorus illigeri Hybosorus illigeri Hybosorus illigeri ... Ochthebius Ochthebius Ochthebius FAMILY HYDROPHILIDAE (Water Scavenger Beetles) Browse here. Water scavenger beetle, any of the approximately 3,200 species of the predominately aquatic insect superfamily Hydrophiloidea (order Coleoptera). Back to Top. Indeed, the two share classification in the beetle Order Coleoptera. Review of the Family Hydrophilidae of Canada and Alaska, Clifford H.F. (1991) Aquatic invertebrates of Alberta, Florida Association of Benthologists website, MacGown J.A. Their larvae are predaceous. Contributors own the copyright to and are solely responsible for contributed content.Click the contributor's name for licensing and usage information. Water Scavenger beetles (WSB) are hefty beetles (some measure more than 3 inches) that are often mistaken for the Dytiscids or Predaceous Diving beetles (PDBs) of previous BOTW fame. They are similar to predaceous diving beetles, but unlike them many have a distinctive spine running down the center of their bellies. Many have keeled sterna. Even their larvae are omnivores, eating small insects, detritus, and other debris in the water. Species. Water Scavenger Beetle (Family Hydrophilidae) Tolerance: moderate : Image 19 (adult - 10 mm) East Fork Lewis River Lewisville Park . Some terrestrial species feed on various decaying matter and associated maggots. While other water beetles swim by alternating their leg movements, the diving beetle moves its legs together like oars. These beetles are found swimming in marshy freshwater ponds throughout the world, especially in warm regions. The wing covers often reflect faint greenish or purplish hues. When the wings are closed, the elytra create a line straight down the back. Crawling Water Beetle (Family Haliplidae) Tolerance: tolerant : Image 185 (adult) private pond Clark County, WA. They also suck the sap of the nearby plant. They live in ponds, shallow lake areas, and still areas of rivers and streams. Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. Your donation to BugGuide will be matched up to $2500! The family hydrophilidae is a part of the larger genus Tropisternus which has been generally studied to perform acoustic sounds in their communicative behavior. Two families of Coleoptera are bioluminescent (able to produce light). Alberta Lepidopterists' Guild. Adults sometimes hibernate and can be found in the water all year. mon and recognizable members of the water beetle family Hydrophilidae. Others are herbivores and scavenge off of aquatic plants. The swimming method helps distinguish them from the similar water scavenger beetles, which are in a different family. This beetle needs fresh water to reproduce, and prefers to dwell in large, deep ponds (Matta 1974). Everything else copyright © 2003-2020 Iowa State University, unless otherwise noted. 2: Hydrophiloidea (Coleoptera). Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles (Polyphaga) » Series Staphyliniformia » Water Scavenger and Clown Beetles (Hydrophiloidea) » Water Scavenger Beetles (Hydrophilidae) 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). 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. Cocoon-Like case that is attached to aquatic plants family: Hydrophilidae Identification: Smooth, oval dark. At the start, but we are mostly just amateurs attempting to make sense of a natural... 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