A genus of large diving beetles, the most well-known type of dytiscid, found in freshwater throughout the Northern Hemisphere.
From Greek 'dytes' (diver). Dytiscus was one of the first diving beetle genera to be formally named in Linnaean taxonomy, making it the type genus for the entire family.
The Great Diving Beetle (Dytiscus marginalis) is absolutely ferocious for its size—it hunts fish, tadpoles, and even small frogs, seizing prey with spiked front legs and drowning them in enzymes. Medieval people called them 'water tigers'!
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