We're very interested to have the opportunity to CAT scan the skull of Allosaurus because in terms of its position in the family tree of predatory dinosaurs, it was kind of right in the middle.
His doctoral thesis was on the genealogy of Gall wasps, a subject he tackled with intensity; meticulously collecting over five million samples, measuring hundreds of thousands of specimens.
The importance of embryological characters and of rudimentary organs in classification is intelligible, on the view that a natural arrangement must be genealogical.