As described in Dutch daily Leidsch Dagblad of 29 January 2007, Rita Caspers was walking on Noordwijk beach with her sister.
There, she found a rare sea animal, a sea mouse.
Not a real mouse: a worm, related to earthworms.
Its scientific name, Aphrodite, is derived from the Greek goddess of love.
Ms Caspers put the beached animal back into the sea.
On tapeworms (not close relatives): here.