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As a correction to what the previous anon said, Edaphosaurus was the largest edaphosaur, at 3.5 metres, as well as having a bulkier body.
Yep, the biggest species of Edaphosaurus are a little bit larger than Romer & Price’s upper estimate for Lupeosaurus. They would have had around twice the physical mass, too, due to being chunky big-bellied herbivores.
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Lupeosaurus isn't small--it was by far the largest edaphosaur! See Romer & Price (1940) for measurements--adults ~4 m long.
I was finding very inconsistent sizes for Lupeosaurus, and went with the smaller measurement because it seemed to be more commonly listed. Digging a bit further, though, you’re probably right -- Romer & Price do estimate 2.5-3.3m -- and it’s possible the smaller figures are actually being confused with Ianthasaurus or Glaucosaurus.
I’ll correct the post in a moment. Thank you!
Weird Backs Month #04 -- Lupeosaurus
Lupeosaurus was another edaphosaur, known from the Early Permian of Texas, USA (~298-295 mya). Only a few fragmentary fossils have been found, but it was probably an insectivorous species, around 60cm long (2′), about 3m long (9′10″), and seems to have had unusually beefy limbs -- suggesting it was a relatively powerful predator.
Unusually for an edaphosaur, its sail completely lacked the characteristic cross-bars, which led to confusion over its classification when it was first discovered. With so much of its skeleton still unknown, however, it could still turn out to be even more unusual if other fossils are ever found.
It was also originally named as Luperosaurus, but was later changed when the first specimen turned out to actually be the pelvis of the amphibian Eryops, making the original name an invalid synonym. It was re-described with new material with its current name, which was fortunate because the original name would have eventually had to be changed anyway due to it being preoccupied -- Luperosaurus was already assigned to a type of gecko.
