Silvadectes absitus (aka Diadectes absitus Berman et al 1998; late Early Permian) is a basal diadectid of medium size and narrow build.

Diadectes (Disparactus) zenos (UC679) is another, hump-back species of Diadectes.

Diadectes phaseolinus is another, less robust, species of Diadectes.

Milleretta and its descendants include Belebey, Oradectes, Silvadectes and Diadectes. Bradysaurus is a pareiasaur. Paliguana is basal to lepidosauriformes.

Berman DS, Sumida SS and Lombard RE 1992. Reinterpretation of the Temporal and Occipital Regions in Diadectes and the Relationships of Diadectomorphs. Journal of Paleontology, Vol. 66, No. 3 (May, 1992), pp. 481-49.

Berman DS, Sumida SS and Martens T 1998. Diadectes (Diadectomorpha: Diadectidae) from the Early Permian of central Germany, with description of a new species. Annals of Carnegie Museum 67:53-93.

Cope ED 1878a. Descriptions of extinct Batrachia and Reptilia from the Permian formation of Texas. Proceedings of the American Philosophical Society 17:505-530.

Cope ED 1878b. A new Diadectes. The American Naturalist 12:565.

Kissel R 2010. Morphology, Phylogeny, and Evolution of Diadectidae (Cotylosauria: Diadectomorpha). Thesis (Graduate Department of Ecology & Evolutionary Biology University of Toronto).

wiki/Diadectes