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Identification keys

Interactive keys

AphID - An identification key to the world's most polyphagous and/or cosmopolitan aphids

Aphis of the midwestern USA - 3I interactive key

Dichotomous keys

Aphids on the World's Plants - Blackman & Eastop's seminal works, kept up to date in digital form

Encyclop'Aphid's illustrated keys to European crop-feeding aphids, grouped by plant family (in French)

Aphids in life

Aphid identification and information at Influential Points, with a focus on the European fauna

Aphids of Quebec - Species list, photographs, predators, parasites, references (in French)

PhylAphidB@se for the identification of European aphids.