The take-home message from this was that although there is great variation in skull shapes, all of the examples he showed us (from fish to hippos) are built on the same basic plan, with the same basic parts. The variation was provided by slight changes in size and shape of the different skull parts. It's this kind of change that is suggested by the ToE, and what I hope to try and convey by doing this exercise is that 'micro' and 'macro' changes are one and the same thing, just separated by the timescale involved.
This is exceptionally well-shown by Jennifer Clack's book
Gaining Ground, which shows a huge bunch of fossil skulls from the Devonian - fishy critters to less-fishy critters that had pelvises, legs, and feet. Very tough reading, because it's so technical (logidemic, maybe?), but very interesting.
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