Which group of echinoderms is the most likely to feed on plankton as and suspended detritus?

The group of echinoderms most likely to feed on plankton and suspended detritus is the sea cucumbers (Holothuroidea). They have specialized feeding structures called tentacles that they use to capture small particles from the water. Sea cucumbers can also filter-feed by taking in sediment and extracting organic matter. This adaptability allows them to thrive in various marine environments.