By the mid-Triassic, there were many synapsid species that looked like mammals.
From the en.wikipedia.org
The pelycosaurs, the first major group of synapsid animals, dominate the land.
From the newscientist.com
Why are we interested in looking for synapsid fossils in the Pedra de Fogo Formation?
From the scientistatwork.blogs.nytimes.com
So any synapsid fossils we find during the course of our fieldwork could prove important.
From the scientistatwork.blogs.nytimes.com
The synapsid pelycosaurs included the largest land vertebrate of the Early Permian, Cotylorhynchus.
From the en.wikipedia.org
The sauropsids would evolve into modern-day reptiles and birds, while the synapsid branch led to mammals.
From the en.wikipedia.org
The largest carnivorous synapsid was Anteosaurus from what is now South Africa during Middle Permian era.
From the en.wikipedia.org
All synapsid fossils known from this time have been found in the narrow belt near the equator that is highlighted in yellow.
From the scientistatwork.blogs.nytimes.com
Christian has experience studying broad evolutionary patterns in synapsids and has done detailed work on several synapsid subgroups.
From the scientistatwork.blogs.nytimes.com
More examples
Extinct reptile having a single pair of lateral temporal openings in the skull
(synapsida) extinct reptiles of the Permian to Jurassic considered ancestral to mammals
Synapsids ('fused arch') are a group of animals that includes mammals and everything more closely related to mammals than to other living amniotes. ...
Member of an amniote clade distinguished by a single hole on each side of the skull, including the mammals.
A group of reptiles including the pelycosaurs and therapsids out of which the mammals emerged.
One of the two major amniote lineages that diverged during the Carboniferous period (360-300 million years ago), the other being the diapsids. Synapsids are ultimately ancestral to the mammals, which first appeared in the late Triassic.
The group synapsid contains all the animals that have ever had the synapsid skull, this includes the therapsids ( the reptilian ancestors of mammals) and the mammals ( see mammal like reptiles). ...