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Chironomus riparius Meigen, 1804
This species is a non-biting midge which can emerge in large numbers, becoming a nuisance pest. The natural habitats are the sediments of slow-moving streams. It can breed in water with high organic pollution, and is regarded as an indicator of poor water quality. The larvae contain large amounts of haemoglobin, giving them a red colour (blood worms, a name also used for other Chironomus species and for other organisms). The haemoglobin allows the larvae to live in a low-oxygen environment.