Gammarus obruki[1] is a species of freshwater amphipod, collected from İnderesi Cave, Bartın Province, Turkey.

This species belongs to the Gammarus pulex-group.

The most discriminant characters of this species are the presence of prolonged extremities, including a very long antennae, up to 52 segmented flagella, a densely setose fifth peduncle, l flagellar segments of antenna, and a fourth peduncle segment that has no long setae.

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