Subclass Graptolithina Bronn 1849 (graptolite)
Parent taxon: Pterobranchia according to J. Maletz 2017
See also Bulman 1970, Lo Valvo et al. 2020, Maletz 2014, Mitchell et al. 2013, Sepkoski 2002, Toro 1993, Toro 1995 and Toro and Herrera Sánchez 2019
Sister taxa: Cephalodiscida, Mastograptus, Rhabdopleurida
Subtaxa: Acanthastida Ascograptus Camaroidea Ceramograptus Crinocaulis Crustoidea Cyclograptidae Dendroidea Diplograptoidea Dithecodendridae Dithecodendrum Dithecoidea Graptoblasti Graptolithus Graptoloida Graptoloidea Graptovermida Leveillites Limpidograptus Palmatophycus Pilograptus Rhabdopleuridae Siryngotaenia Stolonoidea Thamnograptus Trigonograptus Tuboidea Wimanicrustidae