Daemonosaurus, a basal phytodinosaur, was published in two lateral views, left and right with bones partly disarticulated (Fig. 1). Not readily apparent, some palatal and occipital bones are also visible. I ignored those earlier, but add them here (Fig. 2). This is made doubly difficult because sister taxa palate data is scarce.
the colors traced here (Fig. 1) are restored to their in vivo places (Fig. 2). Notably this is quite a tall and narrow skull, as in Heterodontosaurus. Note the relatively short mandible (overbite) — unless you add a mandible tip. Luckily such a tip is apparent just beyond that anterovental break in the matrix in the upper image of figure 1 (Fig. 3). Without some sort of addition, the mandible is way too short relative to the rostrum.
of Daemonosaurus is here (Fig. 3). It extends the mandibles to their proper length (Fig. 2). As a phytodinosaur, Daemonosaurus might have used its long premaxillary teeth to comb vegetation to remove the greenery while leaving the stems.
Several basal sauropodomorphs also had an overbite. So an overbite is not an autapomorphy at this node. Even with the addition of a predentary, Daemonosaurus also had a short mandible (Fig. 2).
It’s worth taking a look at another, more distant sister, Dryosaurus (Fig. 4), another phytodinosaur that provides clues to the architecture of the palate of Daemonosaurus. Perhaps Dryosaurus gives us further clues to the unknown post-crania of Daemonosaurus.
Sues H-D, Nesbitt SJ, Berman DS and Henrici AC 2011. A late-surviving basal theropod dinosaur from the latest Triassic of North America. Proceedings of the Royal Society B, published online