Synapsid Kids T-Shirts

Dimetrodon was part of a group known as known as mammal-like reptiles or stem-mammals. While they share many traits with modern reptiles and modern mammals they are neither, but are part of the overall group called Synapsids that includes all modern mammals (even humans like you). While it is often associated with dinosaurs in popular media these sail-backed quadripeds are much older than that group and are most closely related to us than they are to dinosaurs. Dimetrodon main defining traits include a very distinctive sail supported by extensive neural spins, as well as a set of differentiating teeth that were clearly evolved to different uses, something we and most modern mammals share.

Roughly 259.8 to 254.1 million years ago during the Late Permian era in what would eventually become South Africa, deserts sands blew across an arid landscape. Meanwhile, to escape the oppressive heat and avoid predation a tiny synapsid called Diictodon (the name meaning “two weasel toothed”) used it’s stubby legs, sharp claws, and peculiar tusks to dig into their earth, constructing relatively large (for their size) corkscrew-shaped burrows, designed to protect and give them an easy route up and down.

During the Late Permian period (around 260 to 254 million years ago) Inostracevia and the rest of it’s family group, Gorgonopsidae were some of the largest predators on the planet, they roamed what is now Northern Russia, stalking their prey with a smiled full of sabers. Gorgonopsids were part of a group called therapsids, a group of animals that include mammals and their ancestors. They were a group that also shared common traits with reptiles but weren’t quite part of either modern group.

Shout out to one of our most distant relatives straight from the Permian! Sport a shirt with your gator-puppy cousin on it to show your love!

Aulacephalodon was a pig-sized, not-mammal early relative of mammals, making it a non-mammalian synapsid. Like all dicynodonts within this clade, it had a beak for cutting plants. It lived before the dinosaurs. It is from the Permian period of geologic time, and lived in South Africa. Note from the uploader --- although this is a digital artwork, it is also hand-drawn.

Hand-drawn, digital artwork of a Keratocephalus interpretation, teal in color. Keratocephalus was a plant-eating dinocephalian, and lived in the Permian period of geological deep time --- the period right before the one in which dinosaurs first appear. It was hunted by large carnivores of its time and area, like Anteosaurus.

Illustration of the early mammal-like reptile dimetrodon at the shore of a body of water. Frequently mistaken for a dinosaur, this animal was a synapsid, and died out 40 million years before the first dinosaurs appeared. It lived 295 to 272 million years ago, during the Early Permian. Most of the known fossils have been found in Texas, USA. Around 3 metres in length, it was one of the dominant land predators at the time. The neural spine sail may have been for thermoregulation, but is also thought to have been used for mating displays

Did you know that Dimetrodon is not a dinosaur? It is an extinct genus of non-mammalian synapsid that lived around 295–272 million years ago. Mammals are also synapsids (while dinosaurs are not) making us humans a closer relation genetically. They also incorrectly appear with dinosaurs in cartoons and movies millions of years after being extinct as a species (for example The Land Before Time).

Dimetrodon

Get yourself your own derpy Dimetrodon! have a bit of carnivorous chear!

Dimetrodon is an extinct genus of non-mammalian synapsid that lived during the Cisuralian

Estemmenosuchus mirabilis was a genus of therapsid that lived during the Middle Permian (267 million years ago). Found in what is now the Perm region of Russia in the 1960s, both of the currently recognized species: E. uralensis and E. mirabilis are most recognizable from their distinctive knobby, antler-like facial structures; these structures are in face where they get their name which means "crowned crocodile."

A cozy little Cotylorhynchus companion for your day to day ventures!

Show your love of the Gorgon-Faced synapsid, Gorgonosis!

My best work to date. A dimetrodon is happy, what did it see? Ice cream? Or a amphibian?

A cozy little Dimetrodon companion for your day to day ventures!

Diictodon is a small herbivorous Non-mammilian Synapsid that is now extint.

For all proud ancestors of the survivers of the great dying

Brontosaurus is a genus of gigantic quadruped sauropod dinosaurs.

Edaphosaurus was an herbivorous synapsid that lived from the Late Carboniferous to the Early Permian eras (303.4 - 272.5 MYA), they were a close relative of Dimetrodon.