McNamara, Ken J. Invertebrate Paleontology Section, Western Australian Museum, Perth, Australia.
- Cellular level
- Variation within species
- Variations between species
- Evolutionary trends
- Major evolutionary novelties
- Related Primary Literature
- Additional Reading
An evolutionary phenomenon that involves changes in the rate and timing of development. As animals and plants grow from their earliest embryonic stages to the adult, they undergo changes in shape and size. This life history of an individual organism is known as its ontogeny. The amount of growth that an organism experiences during its ontogeny can be more or less than its ancestor. This can apply to the organism as a whole or to specific parts.
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