Abstract
AbstractThe issue of the origin and phylogenetic significance of the “intracranial joint” and the “ventral otic fissure” has in recent years been much debated. Two antipodal opinions exist. One calls for their origin independently of one another and maintains that they represent relatively primitive features. The other holds them to be specializations derived from an erstwhile basicranial fissure which either became extended up to the roof of the cranium or, from a position close behind the hypophyseal fossa, migrated backwards, as the posterior myodome developed. In this paper, the former view is upheld, whereas the latter is demolished.
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