This new species could also easily be confused with the Dimetrodon - both have four stubby limbs and tall fins on their backs. However, it had an unusually narrow skull - hence the nickname "Fox-Faced Finback" - which was probably used for some kind of adapted feeding strategy, like burrowing.
(c) Robert T. Bakker
And, instead of the Dimetrodon's enlarged killing fangs, Secodontosaurus had a long row of small teeth, each sharp-edged like a little knife blade.
This species is also much more rare than Dimetrodon, fossils of which are all over the Texas Red Beds. The last fossil of Secodontosaurus found there was unearthed in 1936.
That is, until dig team member and teacher Nancy Lauletta Bowen discovered a piece of one in 2006. This is the first Secodontosaurus fossil found in 70 years, and it's the first excavated with modern, CSI methods - which means that much more diverse information has been preserved about this fossil than any other of its kind.
Lauletta Bowen and Dr. Bakker point to her Secodontosaurus find. Detailed image below.