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Gerris lacustris
"Brownish-black in colour, with a narrow body. The forelegs are short and used for grasping and holding prey. The middle and hind legs are long and slender; the hind pair are used as 'rudders', while the middle pair of legs are used to propel the bug along the surface of the water." ARKive
Streams in Serra de Grândola
Alfaiate
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