The whirligig beetles, including Macrogyrus striolatus, are named after their habit of swimming in circles on water surfaces. Scientific Name: Family Dermestidae; most are found in the wild, but a few species are well known pests. Scientific Name. Adult: The adults of Cyrtobagous salviniae measure 2 to 3.5 mm long and are brown during the first five days following emergence before turning shiny black for the remainder of their life. Water scavenger beetles make up the family Hydrophilidae. They are about one inch long, dark brown in colour with golden highlights and short, but sharp, pincers). Dytiscidae (Diving beetles) Hydrophilidae (Water scavenger beetles) Haliplidae (Crawling water beetles) Gyrinidae (Whirligig beetles) Scirtidae (Marsh beetles) Elmidae (Riffle beetles) Size: Very small; usually about 1/4 inch in length. Conservation Status. The front wings have a leathery base; the outer wings areas are more membranous with well defined veins. Aquatic hydrophilids are notable for their long maxillary palps, which are longer than their antennae. Scientific classification: Water beetles belong to the order Coleoptera. The insect can store a supply of air within its silvery belly, much like a deep-sea diver stores air in a tank. Scientific name: Lethocerus americanus The Giant Water Bug is the biggest bug in Minnesota -- a full 2-inches long and about 1-inch wide. Not listed by IUCN. Wirligig Beetles: Crawling Water Beetles: Variegated Mud-loving Beetles: Clown Beetles: Minute Moss Beetles: Water Scavenger Beetles: Short-winged Flower Beetles: Lined Flat Bark Beetles: Fireflies: Minute Brown Scavenger Beetles: Round Fungus Beetles: Stag Beetles: Net-winged Beetles: False Darkling Beetles: Blister Beetles: Soft-winged Flower Beetles: Root-eating Beetles The front legs are adapted to capture and hold prey. The name says it all. Detailing the physical features, habits, territorial reach and other identifying qualities of the Water Scavenger Beetle. Hydrophilus triangularis. Hydrophilidae, also known colloquially as water scavenger beetles, is a family of chiefly aquatic beetles. Water Scavenger Beetle (Hydrochara spp.) Range: Throughout the world Dytiscidae – (able to dive) are known by various common names around the world, including predaceous diving beetles, water beetles and diving beetles). Habitat: Found wherever there are stored organic materials. This creature is in the … True, or diving, water beetles make up the family Dytiscidae. Photograph by Alana Russell, LSU AgCenter. Common Name: Waterbug Scientific Name: Lethocerus sp. Pupa of Cyrtobagous salviniae (Calder & Sands). Whirligig beetles make up the family Gyrinidae. Order: Hemiptera Description: Adults can be over 2 inches long, flattened and oval in shape and are basically a green-brown in color. 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