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particles that come in contact. Once they have caught a particle of food, the tube feet flick it into the ambulacral groove, where the cilia propel the mucus and food particles towards the mouth. Lappets at the side of the groove help keep the mucus stream in place. The total length of the food-trapping surface may be very large; the 56 arms of a Japanese sea lily, with 24 cm arms, have a total length of 80 m including the pinnules. Generally speaking, crinoids living in environments with relatively

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