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, Schizograpti, Tetragrapti
Subtaxa: Calamograptus Temnograptus
Ecology: passively mobile planktonic suspension feeder
Distribution:
• Ordovician of Australia (2 collections), France (1), New Zealand (1), the Russian Federation (2)
• Arenig of France (1), Morocco (1)
Total: 8 collections each including a single occurrence