sentence: Sea cucumbers have between ten and thirty such tentacles, depending on the species.
sentences_before: Highly modified tube feet around the mouth are always present. These are  branched and retractile tentacles, much larger than the regular tube feet.
sentences_after: There is a ring of larger ossicles round the mouth and oesophagus to which the muscles of the tube feet are attached. With their sticky tentacles the animal collects detritus and small organisms.
concept_name: sea cucumber
headings: Sea cucumber Overview Feeding
categories: Echinoderms