found: Work cat.: 97-13547: Principles of animal design, c1998:CIP galley (defined as the state of structural design commensurate to functional needs resulting from regulated morphogenesis, whereby the formation of structural elements is regulated to satisfy but not exceed the requirements of the functional system; symmorphosis combines three elements: functional performance, functional capacity, and economy of structural design; animals built economically with no more structure than that needed to perform their function; ... principle of symmorphosis which postulates that the quantity of structure an animal builds into a functional system is matched to what is needed)
