I've just got this good news from Collecta:
"Edaphosaurus...meaning 'Pavement lizard'
This comes from the Late Carboniferous to Early Permian era and lived some 300-280 million years ago. It is not a dinosaur but a Synapsid like Dimetrodon, that we did last year. However unlike Dimetrodon it was a herbivore. It had a small head compared with its body size and a dense battery (or pavement) of teeth for crushing vegetation which gave it its name.
Like dimetrodon it also had a sail on its back but this had cross bars projecting horizontally and the Edaphosaurus evolved their sails independently of dimetrodons. We have interpreted these cross bars as being strengtheners for supporting a much thicker and heavier sail than Dimetrodon had. The sail may have acted as a sexual recognition device and also as fat storage.
Our model raises the body off of the ground for walking like a modern crocodile."
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