Notonecta glauca
Encyclopedia
Notonecta glauca is a species of backswimmer
Notonectidae
Notonectidae is a cosmopolitan family of aquatic insects in the order Hemiptera, commonly called backswimmers because they swim upside down. They are all predators, up to nearly 2 cm in size. They are similar in appearance to Corixidae , but can be separated by differences in their...

. It the most widespread and abundant of the four British notonectids.
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