. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. STATUS OF INVERTEBRATE PALEONTOLOGY, 1953 189 — are the evolutionary reservoirs from which the great host of Jurassic and Cretaceous ammonoids are derived. The Lytocera- tina and Phylloceratina are characteristic of the ancient Tethys; they are the leiostracous or smooth shelled forms. The trachyos- tracous or ornamented genera are most abundant in the epicon-. Fig. 4. Diagram showing inferred phylogeny and geologic distribution of Permian and Triassic ammonoids. tinental seas adjoining the Tethys. Some 30 years ago S
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. STATUS OF INVERTEBRATE PALEONTOLOGY, 1953 189 — are the evolutionary reservoirs from which the great host of Jurassic and Cretaceous ammonoids are derived. The Lytocera- tina and Phylloceratina are characteristic of the ancient Tethys; they are the leiostracous or smooth shelled forms. The trachyos- tracous or ornamented genera are most abundant in the epicon-. Fig. 4. Diagram showing inferred phylogeny and geologic distribution of Permian and Triassic ammonoids. tinental seas adjoining the Tethys. Some 30 years ago Salfeld proposed his theory of Iterative Evolution in which he inter- preted the innumerable throngs of the Ammonitina as arising through repeated radiations of offshoots from the conservative. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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