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. Indeed, the two share classification in the beetle Order Coleoptera. Their swimming may be “clumsy” compared to the more streamlined PDBs (scavengers don’t need speed or maneuverability), but they are good flyers. Depending on the source of their food, water beetles are scavengers, herbivores or predators. Water Scavenger Beetles and their offspring prey on their smaller aquatic neighbors, the adults also scavenge, resulting in a food pyramid that includes decaying vegetation and dead animal tissue. Order Coleoptera - Family List Go to: Adult Larvae. Some terrestrial species feed on various decaying matter and associated maggots. Their food-list includes their brethren; they love mosquito larvae but will go after mini-fish and so are an unwelcome addition to a koi pond. In The New Field Book of Freshwater Life, Elsie Klots says that the egg case of one genus includes a vertical “mast” that extends above the water’s surface. Sometimes considered a subfamily of the water scavenger beetles (Hydrophilidae), the adults of this group of small beetles are recognized by five parallel grooves in their pronotum. The predatory great diving beetle eats the tadpoles, worms and sometimes the smaller fishes. The larvae is a “couch-potato” version of the sleek PDB larvae/ water tigers (pictured) (they sometimes share the “water tiger” moniker). Water scavenger beetle definition is - a water beetle of the family Hydrophilidae. While other water beetles swim by alternating their leg movements, the diving beetle moves its legs together like oars. Others are herbivores and scavenge off of aquatic plants. The water scavenger beetle has triangular yellow markings on the sides of the abdomen and usually swims near the bottom of shallow pools. What they don’t share is a lifestyle. They also suck the sap of the nearby plant. At the water’s surface, the beetles project their antennae out of the water to capture a bubble of air. The sound production comes from the friction created by the beetle rubbing its spectrum (a well- defined ridge or lip) to its finely ridged surface called a pars stridens on the beetle's underside. Notes - Water scavenger beetle larvae can often be difficult to identify below the Family level. Order: Coleoptera (Beetles) Family: Hydrophilidae (Water scavenger beetles) Description and Distinctive Features: The adult giant water scavenger beetle is a glossy black, smooth bodied beetle that is 27-40 mm long. 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). Although WSBs and their offspring do prey on their smaller aquatic neighbors, the adults also scavenge, resulting in a food pyramid that includes decaying vegetation and dead animal tissue. Water Scavenger Beetle (Family Hydrophilidae) Tolerance: moderate : Image 19 (adult - 10 mm) East Fork Lewis River Lewisville Park . Water Scavenger Beetle (Family Hydrophilidae) July 21, 2009 Pevnick. North America hosts about 200 species of WSBs, including an alien/introduced species that makes itself at home in dung, where its larvae eat maggots. 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. Some adults are scavengers and feed on dead plant and animal material, others are predatory. Commonly seen across the continental US, this beetle has the widest distribution in the genus Hydrophilus (Short and McIntosh 2014). Water scavenger beetles are a mostly aquatic family. (ed.) (2010) Aquatic Hydrophilidae of Mississippi. A Water Scavenger Beetle. The whirligig beetles (family Gyrinidae) are oval, shiny, blue-black to dark brown beetles, about 3/4 in. They also share the same freshwater ponds and quiet stream edges (although WSBs like their weedy, algae-choked water a bit warmer than PDBs do). Voshell, in A Guide to Common Freshwater Invertebrates of North America, says that beetle comes from the Old English bitula—to bite—a reference to the strong jaws of adult beetles. They live in ponds, shallow lake areas, and still areas of rivers and streams. Georyssidae, Helophoridae, Hydrochidae, Spercheidae, Sphaeridiidae, Aquatic forms may superficially resemble Dysticidae but can be easily distinguished by antennae. Like the true water beetles, water scavenger beetles must find a way of supplying themselves with oxygen while they forage underwater. Larvae back their abdomen up to the water’s surface and take in air through spiracles (pores) at its tip. Water scavenger beetles (family Hydrophilidae) are primarily tropical aquatic beetles. This beetle needs fresh water to reproduce, and prefers to dwell in large, deep ponds (Matta 1974). In: Zhang Z.-Q. Voshell, … Scavenger beetles consume the dead and decaying organic material found in the water. WSB larvae often have paired, gill-like structures protruding from the sides of their abdomens. (19 mm) long. 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. The beetles are strong fliers and sometimes are attracted to lights at night. Animal biodiversity: An outline of higher-level classification... World Catalogue of Insects, Vol. They are, in turn, eaten by fish and targeted by many parasites. Species. The ground beetles. 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) Contributors own the copyright to and are solely responsible for contributed content.Click the contributor's name for licensing and usage information. The wing covers often reflect faint greenish or purplish hues. 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. Order - Beetles - Coleoptera. The usually-black WSBs have a more “domed” shape than the usually-black PDBs, and their flat, ventral surfaces often sport a keel. Hydrophilidae, also called water scavenger beetles, is a family of chiefly aquatic beetles. Phylum - Insects, Springtails, Millipedes - Mandibulata. A case may hold 100+ eggs at the start, but cannibalism reduces the number of larvae that live to exit. Chronological Index to the Field Station Bulletin. Image 20 (adult - 10 mm) East Fork Lewis River Lewisville Park . Kingdom - Animals - Animalia. The oval whirligig beetle has brownish yellow legs and often swim in circles. The family hydrophilidae is a part of the larger genus Tropisternus which has been generally studied to perform acoustic sounds in their communicative behavior. Aquatic hydrophilids are notable for their long maxillary palps, which are longer than their antennae. Their feeding category is “engulfer-predator;” they use their hollow jaws to suck out the juices of their prey. This decomposed matter can come from smaller dead organisms, feces or aquatic vegetation. The smallest beetle is the fringed ant beetle, Nanosella fungi (family Ptiliidae). 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. 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). BOTW hasn’t plunged underwater for several months now, but in this episode we will get a chance to get our collective gills wet again. FAMILY HYBOSORIDAE (Scavenger Scarab Beetles) Hybosorus illigeri Hybosorus illigeri Hybosorus illigeri ... Ochthebius Ochthebius Ochthebius FAMILY HYDROPHILIDAE (Water Scavenger Beetles) Browse here. Specifically, the water scavenger beetle has many calls including stress calls, a male courtship call, a male copulating sound, and a female rejection buzz. They spend a month underwater as larvae and about 12 days pupating in a cell in moist soil. When the wings are closed, the elytra create a line straight down the back. Habitats discussed in detail in. 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. Class - Insects - Insecta. Crawling Water Beetle (Family Haliplidae) Tolerance: tolerant : Image 185 (adult) private pond Clark County, WA. Alberta Lepidopterists' Guild. Bibliography. Even their larvae are omnivores, eating small insects, detritus, and other debris in the water. Your donation to BugGuide will be matched up to $2500! 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