Figure 14. Skull roof of a juvenile specimen of Heterotis niloticus (UMA F10653, 75 mm SL) in dorsal view. A, photograph. B, line drawing. Note that some skull elements are not included in line drawing (e.g. posterior flanges of the parietals, see Fig. 13). The course of the sensory canals is outlined on the left side. At this stage, the frontals are still tapered slightly anteriorly, so that the anterior margin is narrower than the posterior margin (although this is not as extreme as in the 62 mm SL specimen illustrated by Taverne, 1977: fig. 95).