Phylogeny relates to genetic development of a species during
evolution, while Ontogeny relates to physiological (and
psychological) development of an individual during his / her
lifetime. Phylogenesis: long-term time scale.
Ontogenesis: short-term time scale.
The term Ontogenesis is derived from the ancient Greek
words ontos (ὄντος), meaning "being", plus the term
genesis (γένεσις) meaning "origin", "source", or
In Ontogeny, the suffix -geny also expresses the concept of
"mode of production".