Figure 52. A phylogeny derived from Figure 49 in On the history, osteology, and systematic position of the Wealden (Hastings group) dinosaur Hypselospinus fittoni (Iguanodontia: Styracosterna)

Figure 52. A phylogeny derived from Figure 49 calibrated, by reference to known stratigraphical ranges of individual taxa plotted, against the geological timescale. Approximate age ranges of known taxa are indicated by black rectangles, and where there are implied stratigraphical ranges these are indicated by connecting tramlines. In instances where implied divergence events have occurred and generated substantial ghost-ranges, these are indicated by cross-hatching.