This shiny and very tiny (3-approx 3mm) beetle was attracted by the black light while mothing the other night. According to Bug Guide: "Larvae feed entirely on algae, either the filamentous forms such as Spirogyra, or macroalgae such as Chara. Adults feed on oligochaet worms, small crustaceans, hydrozoans, the eggs of midges, and algae"
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