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1

Small-sized aphid and antennae shorter or equal to half the length of the body

——> 2 

Small- medium-sized aphid with antennae longer than half length of the body

——> 3 

2

Two species morphologically very close but which have different hosts 

Apterous greyish green, with antennae, cornicles and legs pale, antennae short (less than half the length of the body) and pigmented at tip, cornicles short, cauda digitate and slightly pigmented; alate dark, antennae short, abdomen with large marginal and post-cornicular sclerites , cornicles short and dark, cauda digitate  and slightly pigmented
Aphis grossulariae on Ribes uva-crispa (gooseberry)

Apterous dark green or bluish, covered with a fine greyish pruinosity, presence of very large marginal tubercles on all abdominal segments; alate dark, antennae short, abdomen with large marginal and postcornicular sclerites, cornicles short and dark, cauda short and dark
Aphis schneideri on Ribes rubrum and Ribes nigrum (redcurrant and blackcurrant)

3

Aphid with cornicles straight 

——> 4

Aphid with cornicles swollen

——> 5

4

Apterous whitish to yellowish, presence of long capitate hairs on abdomen  and head, antennae longer than body, cornicles straight, long and almost transparent, cauda short, rounded; alate yellowish with abdominal patch notched, antennae longer than body with numerous rhinaria; cornicles long, slightly pigmented, cauda short
Cryptomyzus ribis

Apterous yellow to greenish, antennae same length as body with processus terminalis very long, abdomen with a series of dorsal stripes weakly pigmented, cornicles cylindrical, light-coloured at tip darkened, cauda digitate, light-coloured ; alate with antennae long and black finishing in long processus terminalis, abdomen with segmented stripes which may join up to form a very jagged patch, marginal and post-cornicular sclerites present, cornicles cylindrical and dark, cauda digitate, dark, legs darkened at articulations
Nasonovia ribisnigri

5

Apterous whitish to yellowish with green longitudinal line, antennae very light-coloured with length greater than that of the body, cornicles fine and slightly swollen on distal 1/3; alate with a patch  strongly incised, antennae long and dark, cornicles slightly swollen and pigmented, cauda digitate
Cryptomyzus galeopsidis

Apterous yellowish green, glossy, cornicles quite strongly swollen in middle; alate green with abdominal patch dark and with contour irregular, antennae long and dark, cornicles swollen and slightly pigmented, cauda pale, articulations of legs dark
Hyperomyzus lactucae