1.
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Chrysomelidae (Reed beetle): The body is soft; three-pairs of segmented legs attached to the thorax and two hooks on the lower end of the abdomen. Crawler; Collector/gatherer; S-M (H)(S)
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2.
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Dryopidae (Long-toed beetle): Adults are hard bodied with very short comb-like antennae. The family is similar in appearance to Elmidae. The larva of this beetle is not aquatic but may be found in the splash zone. Clinger/crawler; Shredder; VS-S (M)(S)
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3.
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Dytiscidae (Predacious diving beetle): Legs have five-segments and two-claws on the end; abdomen terminates into a pair of filaments. Adult: slender antennae; hind coxae extends posterior dividing the first abdominal segment into two sections. Swimmer/crawler; Predator; VS-VL (M)(S)
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4.
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Elmidae (Riffle beetle): Larvae: Legs with four segments and a single claw; nine abdominal segments some with a cavity that protect the hind gills. Adult: hard bodied, slender sometimes clubbed antennae; the forewings have numerous rows of indentations; legs long compared to body. Clinger/crawler; Scraper/shredder; VS-S (M)(F)
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5.
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Gyrinidae (Whirligig beetle): Two claws of each leg, legs with five segments; ten abdominal segments with pairs of lateral filaments. Adult: compound eyes, which appear divided into pairs; antennae clubbed; mid and hind legs paddle-like. Swimmer/crawler; Predator; S-L (M)(S/F)
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6.
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Haliplidae (Crawling water beetle): Legs with five segments and a single claw; abdomen terminates into long filaments; some have many long slender filaments along the entire length of the body. Adult: antennae long and slender; forewings have many indentations; legs lined with small hairs for swimming. Swimmer/crawler; Shredder; S-M (H)(S)
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7.
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Hydrophilidae (Water scavenger beetle): Large mandibles; legs with four segments and a single claw; end of the abdomen usually blunt. Adult: antennae clubbed with cup-like segments at the base; hind coxae (joined base) do not extend or divide the abdomen. Swimmer/crawler; Predator; VS-VL (H)(S)
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8.
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Ptilodactylidae (Toe-winged beetle): Legs with four segments and a single claw; abdomen has ventral gills. Very similar in appearance to the riffle beetle larva. Clinger/crawler; Scraper/shredder; VS-S (M)(F)
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9.
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Psephenidae (Water penny): Body flattened with thoracic and abdominal segments expanded so that the legs and head are obscured from above; legs terminate into a single claw. The adult is semi-aquatic, sometimes encountered near the stream. Clinger/crawler; Scraper; VS-M (L)(F)
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