14 Feb 1990
Basics of Taxonomy
Species
- Any two individuals of appropriate mating types can produce a fertile offspring.
- Typically defined as groups of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups.
Genus
They are formed on the basis of three different rules:
- Monophyly: The group excludes non-descendants of the most recent common ancestor of the group.
- Compactness: No needless expansion of a genus.
- Distinctness: DNA sequences are a consequence rather than a condition of diverging evolutionary lineages except in cases where they directly inhibit gene-flow.
