Abstract
Abstract Study of terebratulinids from the Eocene of western Europe shows that an unfavorable biologic environment (abundance of mollusks) rather than the physical environment was responsible for speciation, on the basis of the concept that rare species tend to subdivide into discontinuous groups which in turn exhibit a tendency to subdivide into distinct species. The decline of brachiopods in the Tertiary was not due to modifications of their structure or to degeneration, but to their constitutional inability to compete successfully with mollusks.
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