Class Pterobranchia Lankester 1877 (pterobranch)
Parent taxon: Hemichordata according to C. E. Mitchell et al. 2013
See also Bulman 1970, Lo Valvo et al. 2020, Nielsen 2012, Sepkoski 2002, Toro and Herrera Sánchez 2019 and Zrzavy et al. 1998
Sister taxon: Enteropneusta
Subtaxa: Cephalodiscida Graptolithina Mastograptus Rhabdopleurida Webbyites