Ophiacodontidae
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Ophiacodontidae is an extinct family of early eupelycosaurs from the Carboniferous and Permian. Archaeothyris, and Clepsydrops were among the earliest ophiacodontids, appearing in the Late Carbonifero
Ophiacodon retroversus
Ophiacodon mirus restoration.
Raranimus dashankouensis
Synapsida
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Synapsida is a diverse group of tetrapod vertebrates that includes all mammals and their extinct relatives. It is one of the two major clades of the group Amniota, the other being the more diverse gro
Ophiacodontidae
…are included in the Ophiacodontidae. Protoclepsydrops was also regarded as ophiacodontid, however there is debate as to whether or not it was a synapsid. Echinerpeton and Sterophallodon were included for the first time in a phylogenetic analysis by Benson (2012). Echinerpeton was found to be a wildcard…
Synapsid diversity 3
Skull of Cotylorhynchus, a basal synapsid
Diagram showing synapsid jaw evolution from early "pelycosaur" synapsids to modern mammals
The sea otter has the densest fur of modern mammals.