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A water beetle swimming just under the surface at night, Danube Delta, Romania.<br />
Dytiscidae are a family of water beetles. They have short, but sharp mandibles. Immediately upon biting they deliver digestive enzymes. The larvae are commonly known as water tigers. The family has not been comprehensively cataloged since 1920, but is estimated to include about 4 000 species in over 160 genera.
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A water beetle swimming just under the surface at night, Danube Delta, Romania.
Dytiscidae are a family of water beetles. They have short, but sharp mandibles. Immediately upon biting they deliver digestive enzymes. The larvae are commonly known as water tigers. The family has not been comprehensively cataloged since 1920, but is estimated to include about 4 000 species in over 160 genera.