Evolution of Santonian and Campanian Belemnitella and paleontological systematics; exemplified by Belemnitella praecursor Stolley
J. A. Jeletzky
Upper Cretaceous Belemnitella species, as exemplified by a study of B. praecursor based on material from the northeast slope of the Dnieper-Donets basin, USSR, exhibit a complex evolutionary pattern which is attributed to the interaction of continuing, essentially irreversible orthogenetic trends and temporary, essentially reversible quantitative shifts resulting in a multitude of morphologic forms at each stage in the evolution of the stock. The taxonomic implications of such evolutionary patterns are discussed with special reference to the need for a broader concept of paleontologic species.
This record provided courtesy of AGI/GeoRef.
