The antennae of Euchaeta rimana, a copepod, detect changes in the smooth water current (created by the shrimp's mouthparts) via motion-sensitive hairs.

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"One tiny crustacean, Euchaeta rimana, combines elements of the fish's sensitive skin and the spider's motion-sensitive hairs. The shrimp moves its mouthparts to create a smooth water current that it can detect through sensory hairs on its antennae. As creatures swim by, they create ruffles in this current, creating a ripple 'fingerprint' that the little shellfish can instantly recognize as food or foe." (Shuker 2001:36)

Book
The Hidden Powers of Animals: Uncovering the Secrets of NatureOctober 19, 2019
Dr. Karl P. N. Shuker

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