Hemichordata Taxon list
Atubaria heterolopha Sato, 1936 (uncertain > nomen dubium )
Cephalodiscus aequatus Andersson, 1907 accepted as Cephalodiscus hodgsoni Ridewood, 1907
Cephalodiscus agglutinans Harmer & Ridewood, 1913
Cephalodiscus anderssoni Gravier, 1912 accepted as Cephalodiscus densus Andersson, 1907
Cephalodiscus atlanticus Bayer, 1962
Cephalodiscus australiensis Johnston & Muirhead, 1951
Cephalodiscus calciformis Emig, 1977
Cephalodiscus densus Andersson, 1907
Cephalodiscus dodecalophus M'Intosh, 1882
Cephalodiscus evansi Ridewood, 1918
Cephalodiscus fumosus John, 1931
Cephalodiscus gilchristi Ridewood, 1908
Cephalodiscus gracilis Harmer, 1905
Cephalodiscus graptolitoides Dilly, 1993
Cephalodiscus hodgsoni Ridewood, 1907
Cephalodiscus inaequatus Andersson, 1907 accepted as Cephalodiscus hodgsoni Ridewood, 1907
Cephalodiscus indicus Schepotieff, 1909
Cephalodiscus kempi John, 1932
Cephalodiscus levinseni Harmer, 1905
Cephalodiscus lutetianus Abrard, Dollfus & Soyer, 1950 †
Cephalodiscus nigrescens Lankester, 1905
Cephalodiscus rarus Andersson, 1907 accepted as Cephalodiscus densus Andersson, 1907
Cephalodiscus sibogae Harmer, 1905
Cephalodiscus solidus Andersson, 1907
Pterobranchites antiquus Kozlowski, 1967 †