Cynodontia

Cynodontia () is a clade of eutheriodont therapsids that first appeared in the Late Permian (approximately 260 mya), and extensively diversified after the Permian–Triassic extinction event. Mammals are cynodonts, as are their extinct ancestors and close relatives (Mammaliaformes), having evolved from advanced probainognathian cynodonts during the Late Triassic.

Procynosuchus (Greek: "Before dog crocodile" or "raccoon crocodile") is an extinct genus of cynodonts from the Late Permian. It is considered to be one of the earliest and most basal cynodonts. It was 60 cm (2 ft) long.

Dvinia is an extinct genus of cynodonts found in the Salarevo Formation of Sokolki on the Northern Dvina River near Kotlas in Arkhangelsk Oblast, Russia. It is the only known member of the family Dviniidae. Its fossil remains date from the Late Permian and were found with Inostrancevia, Scutosaurus and Vivaxosaurus.

Procynosuchidae is an extinct family of therapsids which, along with Dviniidae, were the earliest cynodonts. They appeared around 260 million years ago, and were most abundant during the latest Permian time (251 mya), shortly before the Permian-Triassic extinction event. Despite being the basal member of the cynodont clade, they already showed some of the advanced mammalian characteristics, but procynosuchids bore resemblance to the therocephalians.

Epicynodontia is a clade of cynodont therapsids that includes most cynodonts, such as galesaurids, thrinaxodontids, and Eucynodontia (including mammals). It was erected as a stem-based taxon by Hopson and Kitching (2001) and defined as the most inclusive clade containing Mammalia and excluding Procynosuchus, a Late Permian genus that is one of the most basal cynodonts.

Madysaurus (meaning "Madygen reptile") is an extinct genus of cynodonts which existed in Kyrgyzstan. It was first named by Leonid Petrovich Tatarinov in 2005. Madysaurus is known from the Madygen Formation, a Triassic Lagerstätte that also includes well-preserved remains of insects and small reptiles like Sharovipteryx and Longisquama. Madysaurus is one of the most primitive cynodonts and is placed in its own family, Madysauridae.

Charassognathidae is an extinct family of basal cynodonts known from the Late Permian of South Africa and Zambia. It was named in 2016 by the palaeontologist Christian F. Kammerer, who defined it as all taxa more closely related to Charassognathus gracilis than to Dvinia prima, Galesaurus planiceps or Procynosuchus delaharpeae. The family contains the genera Charassognathus, Abdalodon and Nshimbodon, with the latter two making up the subfamily Abdalodontinae.

Sludica is an extinct genus of procynosuchid cynodont from the Late Permian of Russia. Fossils have been found in the Ilinskoe Assemblage Zone within Velikoustyugsky District in Vologda Oblast, correlated with the Cistecephalus Assemblage Zone. The type and only species is Sludica bulanovi.