Orthogenesis was particularly accepted by paleontologists who saw in their fossils a directional change, and in invertebrate paleontology thought there was a gradual and constant directional change.
A ortoxénese era aceptada especialmente polos paleontólogos que vían nos fósiles un cambio direccional, e en paleontoloxía de invertebrados pensábse que había un cambio direccional constante e gradual.