Cephalodiscida

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

Taxonomy

The following taxa are recognised in the order Cephalodiscida:Order Cephalodiscida Fowler, 1892

* Family Cephalodiscidae Harmer, 1905
** Genus Atubaria Sato, 1936
** Genus Cephalodiscus M'Intosh, 1882
** Genus †Aellograptus Obut, 1964
** Genus †Eocephalodiscus Kozłowski, 1949
** Genus †Melanostrophus Öpik, 1930
** Genus †Pterobranchites Kozłowski, 1967
* Family †Rotaciurcidae Briggs & Koch, 2023
** Genus †Rotaciurca Briggs & Koch 2023