FIGURE 7. Outlines of skull roofs of some ichthyodectiforms to show similarities between the two species of Cladocyclus as well as differences from other members of the group. Note shape and extent of supraoccipital and eppiocciptal bones (black and grey respectively), overall proportions of the ethmoid, sphenotic and occipital widths, presence of fenestra in the dorsal aspect of the snout in Cladocyclus. Xiphactinus, Gillicus and Ichthyodectes from Bardack (1965); Cladocyclus gardneri from Patterson and Rosen (1977); Saurocephalus from Stewart (1999).