Morphogenesis in ammonites - differences linked to growth pattern

This paper analyzes the relationship existing between septa and ornamentation in ammonites showing two basic growth patterns: cyclic and uniform. In both CMCS there exists a strong correlation between ornamentation size and interseptal distance, both characters, being related to each other through growth rate. Nevertheless, in the case of cyclic growth, regulation mechanisms appear which prevent the formation of non-adaptative structures induced by extreme deviations in growth rate.