Pterobranchia - Graptoloidea - Dichograptidae
Technically ranked as a "section" grade, but ranking as subfamily because below family rank.
Full reference: O. M. B. Bulman. 1970. Graptolithina with sections on Enteropneusta and Pterobranchia (Second edition, revised and enlarged). Treatise on Invertebrate Paleontology V:V1-V163
Parent taxon: Dichograptidae according to O. M. B. Bulman 1970
Sister taxa: Clonograptus, Dichograpti, Dichograptinae, Dichograptus, Didymograpti, Didymograptus, Etagraptus, Goniograpti, Loganograptus, Orthodichograptus, Temnograpti, Tetragrapti
Subtaxa: Anthograptus Holograptus Mimograptus Schizograptus Trochograptus
Ecology: passively mobile planktonic suspension feeder
Distribution:
• Ordovician of Morocco (1 collection), the Russian Federation (1), United States (2: Idaho, Texas)
• Dawan of China (1)
• Arenig of France (1), Morocco (1), Norway (1)
• Klabava of the Czech Republic (1)
Total: 9 collections including 10 occurrences