Answer :
Common feature is Hair cells with stereocilia
The most common feature of the fish lateral line and statocysts of crustaceans and mammals is hair cells with stereocilia. Other features are not common.
The lateral line is a sensory system allows to detect fragile water motions and pressure gradients. The little functional unit of the lateral line is the neuromast, a sensory structure that comprises of a hair cell epithelium and a cupula that joins the ciliary bundles of the hair cells with the water surrounding the fish. The lateral line of most fishes comprises of hundreds of superficial neuromasts spread over the head, trunk and tail fin.
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