Permian
Links
Systematics of the Synapsida
http://www.ucmp.berkeley.edu/synapsids/synapsidasy.html
Cladogram with links to pages on the Dinocephalids, Pelycosaurs, Dicynodonts, Cynodonts, Mammals and Gorgonopsids.
Fossil Reptiles of the South African Karoo
http://www.museums.org.za/sam/resource/palaeo/cluver/index.html
A very detailed and comprehensive look at the Permian/Triassic ecosystem of Africa, and of the mammal-like reptiles that inhabited it.
The Permian
http://www.ucmp.berkeley.edu/permian/permian.html
An overview of the period from the UC Berkeley Museum of Paleontology.
Permian-Carboniferous Synapsids
http://www.erin.utoronto.ca/~w3bio356/lectures/permo_carb_synapsid.html
Lecture notes from the Major Features of Vertebrate Evolution class at the University of Toronto, focusing on the Pelycosaurs.
First Complete Gorgonopsid Skeleton Found
http://www.washington.edu/newsroom/news/1998archive/12-98archive/k120898.html
An article describing the discovery of this late Permian predator.
Permian Geography
http://vishnu.glg.nau.edu/rcb/Permian.html
Description and maps of the continents as they existed at the time.
Synapsid Classification and Autapomorphies
http://tolweb.org/tree/eukaryotes/animals/chordata/synapsid_lichen/synapsida_synapomorphies.html
A cladistic description with annotated diagrams.
Synapsida - Pelycosauria
http://www.palaeos.com/Vertebrates/Units/Unit390/000.html
An overview of this primitive synapsid class, with links to more detailed information.