Weird Backs Month #10 – Secodontosaurus
The last synapsid for this month, and possibly the most unusual of the sphenacodont sailbacks, Secodontosaurus lived during the Early Permian (285-270 mya) of Texas, USA. Although only known from partial remains, it’s estimated to have measured around 2.5m in length (8′2″).
It had a sail very similar in structure to that of Dimetrodon, with rodlike neural spines, but its most striking feature was actually its skull. Unlike the deep narrow heads of other sphenacodonts, Secodontosaurus had a long low crocodile-like snout. This suggests that it might even have been a fish-eating semi-aquatic synapsid – almost like a Permian version of Spinosaurus.