After Bulman, 1955, and Bates, Kozlowska & Lenz, 2005
<==o †Petalolithidae [Diplograptidae: Petalograptinae Bulman, 1955] |--o †Pseudorthograptus Legrand, 1987 | |-- †P. inopinanus (Boucek, 1944) | `--o †(Pseudorthograptus) | `-- †P. (P.) obuti (Rickards & Koren, 1996) |--o †Hercograptus | `-- †H. introvertus Melchin, 1999 |--o †Petalograptus Suess, 1851 [pro Diprion Barrande, 1850; Petalolithus Suess, 1851] | |-- †P. folium (Hisinger, 1837) S.D. Lapworth, 1873 [Prionotus folium Hisinger, 1837] | |-- †P. ovatoelongatus (Kurck, 1882) | `-- †P. minor (Elles, 1897) [Petalolithes minor Elles, 1897] |--o †Cephalograptus Hopkinson, 1869 emend. Lapworth, 1873 [pro Cephalograpsus Hopkinson, 1869] L.Sil. Eu. EAs. | `-- †C. cometa (Geinitz, 1852) [Diplograpsus cometa Geinitz, 1852] |--o †Dimorphograptoides Koren & Rickards, 1996 |?-o †Victorograptus Koren & Rickards, 1996 |?-o †Corbograptus Koren & Rickards, 1996 `--o †Pernerograptus Pribyl, 1941 `-- †P. argenteus (Nicholson, 1872) [Graptolites argenteus Nicholson, 1872]
Reference(s):
- Bates, D. E. B., Kozlowska, A. & Lenz, A. C., 2005: Silurian retiolitid graptolites: morphology and evolution.
–Acta Palaeontologica Polonica: Vol. 50, #4, pp. 705-720 [http://app.pan.pl/acta50/app50-70.pdf] - Bulman, O. M. B., 1955: Part V – Grapholithina, with sections on Enteropneusta and Pterobranchia. xviii-V101.
in Moore, R. C. (ed.), 1955: Treatise on Invertebrate Paleontology.
–University of Kansas Press and The Geological Society of America, Lawrence, Kansas, 1955