English: A color-coded skull diagram of Concavispina biseridens. Dotted lines indicate missing bone, which was reconstructed based on Thalattosaurus and Xinpusaurus. Some of the sutures near the naris are uncertain. The surangular incorporates an articular. The prefrontal may involve a fused lacrimal, the postorbitofrontal is a fusion of the postorbital and postfrontal, and the coronoid is colored in deep red.