Results for “apomorph”

apomorph

An organism existing in an evolutionary state that represents a morphological advance compared to a previous state. Occurs at an evolutionary branching point and is subsequently carried through only a single descendant group.

apomorphy

A derived character state of a clade; a feature novel to a species and its descendants.

Used in 2 profiles

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.

Used in 42 profiles

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.

Used in 843 profiles

derived

Used in phylogenetics in reference to a character or character state not present in the ancestral form of a species; apomorphic.

Used in 190 profiles

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.

cladistics

Taxonomical method used to classify species of organisms into clades, each of which contains an ancestor organism and all its descendants, based on synapomorphies (shared derived characters). Cladistic classifications are usually presented in the form of a cladogram.

monophyletic

Used in reference to a taxonomic group containing all descendants of a single, often hypothetical, common ancestor, often characterised by one or more synapomorphies. A clade is a monophyletic group.

Used in 330 profiles