Croizat's form-making, RNA networks, and biogeography.

Advances in technology have increased our knowledge of the processes that effect genomic changes and of the roles of RNA networks in biocommunication, functionality, and evolution of genomes. Natural genetic engineering and genomic inscription occur at all levels of life: cell cycles, development, and evolution. This has implications for phylogenetic studies and for biogeography, particularly given the general acceptance of using molecular clocks as arbiters between vicariance and dispersal explanations in biogeography. Léon Croizat's development of panbiogeography and his explanation for the distribution patterns of organisms are based on concepts of dispersal, differential form-making, and ancestor that differ from concepts of descent used broadly in phylogenetic and biogeographic studies. Croizat's differential form-making is consistent with the extensive roles ascribed to RNAs in development and evolution and recent discoveries of genome studies. Evolutionary-developmental biology (evo-devo), including epigenetics, and the role of RNAs should be incorporated into biogeography.