- published: 05 Oct 2014
- views: 9921
A clade is a group consisting of a species (extinct or extant) and all its descendants. In the terms of biological systematics, a clade is a single "branch" on the "tree of life". The idea that such a "natural group" of organisms should be grouped together and given a taxonomic name is central to biological classification. In cladistics (which takes its name from the term), clades are the only acceptable units.
The term was coined in 1958 by English biologist Julian Huxley.
A clade is termed monophyletic, meaning it contains one ancestor (which can be an organism, a population, or a species) and all its descendants. The term clade refers to the grouping of the ancestor and its living and/or deceased descendants together. The ancestor can be a theoretical or actual species.
Three methods of defining clades are featured in phylogenetic nomenclature: node-, stem-, and apomorphy-based:
In Linnaean taxonomy, clades are defined by a set of traits (apomorphies) unique to the group. This system is basically similar to the apomorphy-based clades of phylogenetic nomenclature. The difference is one of weight: While phylogenetic nomenclature bases the group on an ancestor with a certain trait, Linnaean taxonomy uses the traits themselves to define the group.
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Can't see too many more
Can't see them anymore
Waving from afar
Can you come back soon
We wish we could
We think we've gone too far
On this ship of fools
We think we've gone too far
On this ship of fools
And now I walk ashore
Searching for my soul
Body sea and sky
Body sea and sky
Cast upon this sea
Is this ship of fools
Cast upon this sea
Is this ship of fools
They're all aboard
Except for me
Can we come back soon
We wish we could
We think we've gone too far
On this ship of fools
On this ship of fools
On this ship of fools
Now I walk the shore
Searching for my soul
Body sea and sky
I was born sea and sky
In this ship of fool
In this ship of fools
Cast upon this sea
Is this ship of fools
We think we've gone too far
We think we've gone too far
We think we've gone too far