Thus, there is no mechanism of ontogenetic developmental concrescence, just differentiation. |
The Cephalopoda are mainly characterized by the concrescence of the foot and head. |
During later stages of development, the entire ovary wall of typical flowers is formed by the concrescence of the walls of adjacent carpels. |
True concrescence occurs when this union is during tooth development and may result from a lack of space or dislocation of tooth germs. |
Clearly, it is extremely difficult to reconcile whether phylogenetic differentiation or concrescence is responsible for a decrease in the number of skeletal elements. |
Phylogenetic patterns of concrescence and differentiation are similarly achieved through ontogenetic developmental differentiation, or a lack thereof. |