apomorphy
A derived character state of a clade; a feature novel to a species and its descendants.
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Results for “apomorphy”
Ichthyological terms, not general ones.
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synapomorphy
In cladistics, a character or trait shared by two or more taxonomic groups and derived from a common ancestral form, whose ancestor in turn did not possess that trait.
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derived trait
In phylogenetics, a trait present in an organism which was absent in the last common ancestor of the group being considered; an apomorphy. Also used to refer to traits present in the ancestral form that have subsequently been lost.