“Cestida” is a term that refers to a class of marine animals known as “cestodes,” commonly called tapeworms. These are parasitic flatworms that live in the intestines of vertebrates. Cestodes are known for their distinctive flat, ribbon-like bodies and their lifecycle, which typically involves multiple hosts. If you meant to refer to a specific organism or concept within the context of marine biology or another field, please provide additional details for a more accurate definition.
