Glossary

phylogenetic

Of or relating to phylogeny.

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Related terms

character
In ichthyology, any characteristic or its attributes used for recognising, describing, defining, or differentiating species, genera or higher taxa. Also used in phylogenetic analyses whereby ancestral (primitive) characters are termed plesiomorphic and derived (novel) characters apomorphic.
clade
A group of organisms sharing homologous features, believed to have evolved from a common ancestor following the principles of cladistics; a monophyletic group; a grouping hypothesised on the basis of phylogenetic information.
cladogram
Branching, tree-like diagram used in cladistics to represent the evolutionary tree of life. Used to depict phylogenetic relationships and show points at which species diverged from their common ancestral forms.
paedomorphism
Phylogenetic state in which juvenile or larval characters are retained in and throughout the adult stage. May arise via neoteny or progenesis.
phylogenetic species concept
Species concept based on the evolutionary relationships among organisms, specifically using common ancestry and shared evolutionary history to define species. Under this concept a species is essentially the smallest group of organisms that share a common ancestor and can be distinguished from other such groups via phylogenetic analyses. Each such grouping constitutes a distinct branch on an evolutionary tree. Subspecies tend not to be recognised and it is generally less restrictive than the biological species concept. Often abbreviated to PSC.
phylogeny
The evolutionary development and history of a species or other taxonomic group. May be based on morphology, molecular data, or both.

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