This video from the USA says about itself:
The Houston Museum of Natural Science Paleontology team has discovered an articulated specimen of a Dimetrodon on the Craddock Ranch in Baylor County.
By Jennifer Viegas in the USA:
Pre-Dinosaur Predator Found with Fangs Intact
Mon Dec 6, 2010 05:55 PM ET
Paleontologists from the Houston Museum of Natural Science (HMNS) have just announced that they’ve unearthed a rare skull — complete with fangs — for a pre-Dinosaur Era predator that lived 287 million years ago.
Nicknamed “Wet Willi,” the skull and fossils belong to Dimetrodon giganhomogenes. This reptile, with its iconic sail-shaped back, is often mistakenly identified as a dinosaur, and is even included in packages of toy dinosaurs.
Such reptiles, in fact, lived several million years before the first dinos emerged.
Robert Bakker, curator of paleontology at the HMNS, and his team found the new specimen at Craddock Brothers Ranch in Seymour, Texas. “Wet Willi” came to mind as a nickname because the fossils were discovered during the excavation of a drainage trench and because a dino expert named Samuel Williston conducted work in the area 100 years ago. Well-preserved fossils like this of Dimetrodon are rare, according to the researchers.
In life, “Willi” was the dominant predator of his world. He would have been 11 feet long with a four-foot vertical fin running the length of his body. The purpose of the prominent fin that defines this species has been debated since it was first discovered by paleontologist Edward Cope in Texas in 1878.