After Carroll, 1988
<==o †Protorothyrididae [monophyly questionable]
|-- †Anthracodromeus
|-- †Archerpeton
|-- †Brouffia Carroll & Baird, 1972; U.Carb. CEu.
|--o †Cephalerpeton
| `-- †C. ventriarmatum Moodie, 1912
|-- †Coelostegus Carroll & Baird, 1972; U.Carb. CEu.
|-- †Hylonomus lyelli Dawson, 1860 [Fritschia]
`-- †Protorothyris archeri Price, 1937 [Melanothyris]
Reference(s):
- Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698.
- Carroll, R. L., 1988: Appendix. 594-648.
in Carrol, R. L. 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698
- Laurin, M., Gauthier, J. A. & Hedges, S. B., 1996-1997: Amniota - Mammals and reptiles.
–iNet: The Tree of Life