Stephen Dalton / Great Silver Water / Diving Beetle (Hydrophilus piceus) male. Sussex, UK, March.
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Solvin Zankl / Lars Hendrickson watching Black piston water beetles (Hydrophilus aterrimus) feeding on a tadpole, State Collection in Munich, Germany, June
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Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) by green algae, near Falmouth, Cornwall, UK, August.
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Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) hiding behind green algae, near Falmouth, Cornwall, UK, August.
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Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) in rockpool, near Falmouth, Cornwall, UK, August.
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Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) in rockpool, near Falmouth, Cornwall, UK, August.
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Nick Upton / Montagu's / Furrowed crab (Lophozozymus incisus / Xantho hydrophilus) in rockpool, near Falmouth, Cornwall, UK, August.
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Stephen Dalton / Great Silver Water / Diving Beetle (Hydrophilus piceus) male. Sussex, UK, March.
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Stephen Dalton / Great Silver Water / Diving Beetle (Hydrophilus piceus) male. Sussex, UK, March.
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Solvin Zankl / Black Piston water beetle (Hydrophilus aterrimus) [left] and Diving beetle (Dytiscus dimidiatus) [right] held in the hand, Europe
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Willem Kolvoort / Great silver diving beetle (Hydrophilus piceus) sand-winning pit, Holland
![Black Piston water beetle (Hydrophilus aterrimus) [left] and Diving beetle (Dytiscus dimidiatus) [right] held in the hand, Europe](http://nplimages.infradoxxs.com/cache/tcache/01323596.jpg "Black Piston water beetle (Hydrophilus aterrimus) [left] and Diving beetle (Dytiscus dimidiatus) [right] held in the hand, Europe")
