Life › Life & humans today › Common descent & the tree of life
Carl Linnaeus
1707–1778; Systema Naturae 1735; named Homo sapiens 1758· Scientist· Plants & fungi
Well establishedStrong fossil, genetic or geological evidence.
Swedish botanist who formalized the two-part scientific naming system still used today and coined the name Homo sapiens.
See it on the Life map →What happened
Carl Linnaeus, a professor at Uppsala, built the system biologists still use to name and sort living things. Each species gets a two-part Latin name, genus then species, as in Homo sapiens, a name he coined in 1758. Species are grouped into genera, genera into orders, orders into classes, classes into kingdoms. Controversially for his time, he placed humans among the primates, beside apes. He believed species were fixed, created by God.
Why it matters
His groups-within-groups pattern later made sense as a family tree: Darwin explained it as the result of common descent.
Discoveries and legacy
Systema Naturae (1735; 10th edition 1758) and Species Plantarum (1753) are the official starting points for animal and plant names. His four human 'varieties' are now seen as an early root of racial classification.
Connections (2)
▸Carl Linnaeus built the nested classification explained by Common descent & the tree of lifeWell established
The connection
Linnaeus sorted life into groups within groups: species within genera, genera within orders, and so on. He saw this as God's orderly plan. Darwin realized the nested pattern is exactly what a family tree produces: close relatives share recent ancestors, wider groups share older ones. Linnaean classification thus became evidence for common descent.
When and how
Linnaeus in Uppsala, Sweden, 1735–1758; Darwin's explanation in On the Origin of Species, London, 1859.
The evidence
Darwin made this argument explicitly in the Origin's chapter on classification; DNA trees largely recover the nested groups naturalists had found by anatomy.
Debates and open questions
Some Linnaean groups, such as reptiles and fish, are not true single branches, so modern classification is shifting from ranks to lineages; how to name branches is still argued.
▸Carl Linnaeus coined the name Homo sapiensWell established
The connection
In the 10th edition of Systema Naturae (1758), Carl Linnaeus placed humans in the animal kingdom among the primates and gave us the scientific name Homo sapiens, Latin for 'wise man'. His two-part naming system is still used for every species.
When and how
Uppsala, Sweden; Systema Naturae, 10th edition, 1758, which zoologists treat as the official starting point for animal names.
The evidence
The published text survives, and the international code for naming animals takes 1758 as its starting date.
Debates and open questions
Linnaeus named no type specimen. In 1959 botanist William Stearn designated Linnaeus himself as the type of Homo sapiens, a choice not everyone accepts.