A statocyst is the organ that controls balance in Cnidarians and
Echinodermata.
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orient with respect to gravity
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orient with a sense of gravity
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A statocyst at the base of each antennule enables the crayfish to keep its balance.
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Jellyfish can detect vibrations, scent, and with the use of
their eyes, light, dark and movement. They have an organ called a
statocyst that allows them to orient their position.