orthogeneses
/ɔrθoʊˈdʒɛnəsiːz/
noun
- Plural of orthogenesis; multiple instances or types of evolutionary development in a straight line.
- Examples of orthogeneses can be seen in the gradual increase in size of certain dinosaur species.
- The biologist studied several orthogeneses in different fossil lineages.
- The theory proposed that orthogeneses occur when species evolve in a fixed direction over long periods.