Figure 6.4   Tests of allometry in the ichthyosaur Ichthyosaurus. (a) Plot of orbit length against skull length, and (b) plot of skull length against backbone length. The Somerset embryo (Fig. 6.3b) is indicated by a solid circle. Both graphs show negative allometry (orbit diameter = 0.355 (skull length)0.987; skull length = 1.162 (backbone length)0.933), confi rming that embryos and juveniles had relatively large heads and eyes. (Courtesy of Makoto Manabe.)

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