Cephalodiscida
Cephalodiscida
Order in the class Pterobranchia in the phylum Hemichordata
Cephalodiscida is one of two orders in the class Pterobranchia, which are small, worm-shaped animals. Members belong to the hemichordates.[1][2] Species in this order are sessile, living in clear water and secrete tubes on the ocean floor.[3]