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Qu'est-ce (qui) est PACMAD clade - définition
PACMAD clade
MAJOR CLADE IN THE GRASS FAMILY POACEAE
PACCMAD; PACMAD; PACCMAD clade
The PACMAD clade (previously PACCMAD, PACCAD, or PACC) is one of two major lineages (or clades) of the true grasses (Poaceae), regrouping six subfamilies and about 5700 species, more than half of all true grasses. Its sister group is the BOP clade.
Clade
![paraphyletic group]], because it excludes the blue branch which has descended from the same common ancestor. The green and blue subgroups together form a clade again.](https://commons.wikimedia.org/wiki/Special:FilePath/Clade-grade II.svg?width=200 "paraphyletic group]], because it excludes the blue branch which has descended from the same common ancestor. The green and blue subgroups together form a clade again.")
![phylogenetic]] tree of crocodylians.](https://commons.wikimedia.org/wiki/Special:FilePath/Cladogram Crocodilia NL.PNG?width=200 "phylogenetic]] tree of crocodylians.")
![[[Phylogenetic tree]] of the SIV and HIV viruses showing clades (subtypes) of the virus.](https://commons.wikimedia.org/wiki/Special:FilePath/HIV-SIV-phylogenetic-tree straight.svg?width=200 "[[Phylogenetic tree]] of the SIV and HIV viruses showing clades (subtypes) of the virus.")
![Haeckel]], 1866. Groups once thought to be more advanced, such as birds ("Aves"), are placed at the top.](https://commons.wikimedia.org/wiki/Special:FilePath/Haeckel arbol bn.png?width=200 "Haeckel]], 1866. Groups once thought to be more advanced, such as birds (\"Aves\"), are placed at the top.")
GROUP OF A COMMON ANCESTOR AND ALL DESCENDANTS
Clades; Monophyletic group; Klados; Natural group; Cladus; Crown age; Clade (biology)
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, the equivalent Latin term cladus (plural cladi) is often used in taxonomical literature.
clade
GROUP OF A COMMON ANCESTOR AND ALL DESCENDANTS
Clades; Monophyletic group; Klados; Natural group; Cladus; Crown age; Clade (biology)
[kle?d]
¦ noun Biology a group of organisms comprising all the evolutionary descendants of a common ancestor.
Origin
1950s: from Gk klados 'a branch'.
