“basal”

*in ‘phylo-genetics’, basal is the direction of the base (or root) of a ‘rooted phylogenetic tree’ or ‘cladogram’*

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(‘Clade C’ may be described as basal within a ‘larger ‘Clade D” if its root is directly linked (adjacent) to the root of ‘Clade D’)

(if ‘Clade C’ is a basal clade within ‘Clade D’ that has the lowest taxonomic rank of all basal clades within ‘Clade D’, ‘Clade C ‘may be described as the basal taxon of that rank within ‘Clade D’)

(while there must always be 2 or more equally basal clades sprouting from the root of every ‘cladogram’, those clades may differ widely in rank or species diversity)

(greater diversification maybe associated with more evolutionary innovation, but ancestral characters should not be imputed to the members of a less species-rich basal clade without additional evidence, as there can be no assurance such an assumption is valid)

(in general, ‘clade A’ is more basal than ‘clade B ‘if ‘clade B’ is a subgroup of the sister group of ‘clade A’)

(within large groups, “basal” may be used more loosely to mean ‘closer to the root than the great majority of’, and in this context terminology such as “very basal” may arise)

(a ‘core clade’ is a clade representing all but the basal clade of lowest rank within a larger ‘clade’)

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*WIKI-LINK*

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