The structure of certain Jurassic holostean fishes, with special reference to their neurocrania

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Abstract
The bone patterns of the neurocrania of the Jurassic holeasteans are remarkably similar and differ materially from these found in earlier fishes although a broad homology is to be found. The progressive lightening of the actinopterygian skull as a whole is confirmed by a comparison between the living derivatives and their Mesozoic ancestors. The established links between the parasemionotids, eugnathids and amiids are strengthened by the similarity between the lower jaws and also by a comparison of the neurocrania in Caturus and Amia. Similarity of the neurocrania confirm the derivation of Lepidosteus from Lepidotus. Within the plolidophorid-leptolepid-teleost stock the ethmoid and pterotic bones develop phylogenetically from the fusion of cartilaginous and dermal components.