Glossary

derived

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

Used in 192 species profiles

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Related terms

basal
At, towards or constituting a base; primitive. Opposite of derived. In cladistics, used to in reference to a clade within which other clades are nested.
biotic
Consisiting of, associated with or derived from living organisms. Biotic factors in an environment include the organisms themselves plus predation, competition and other interrelationships.
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.
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.
empirical
Derived from or relating to experimental observation as opposed to theory.
ichthyotoxin
Any toxic substance derived from fishes.
organic
Of, relating to, or derived from living organisms.
patronym
In zoological nomenclature, a taxonomic name derived from the name of a person.
patronymic
Of or derived from a personal or family name.
phylogenetics
The study of evolutionary relatedness among species or other groups of organisms. May be based on morphology, molecular data, or both.
plesiomorphy
In cladistics, a character or trait shared by two or more taxonomic groups but derived from a remote or much earlier common ancestral form and therefore cannot be used to define a clade. Also known as an ancestral state and generally appears at the base level of a cladogram.
symplesiomorphy
In cladistics, a character or trait shared by two or more taxonomic groups and derived from a remote or much earlier common ancestral form.
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.
tannin
Any of various yellowish or brownish solid compounds found in many plants and used for various commercial purposes. Derived from gallic acid and also known as tannic acid. Often present in water bodies with large amounts of decaying vegetation or where the underlying or surrounding soil contains peat and responsible for the typically brownish (tea-coloured) water in such environments and aquaria containing certain types of wood.
toponym
In taxonomy, a scientific name derived from a place, region, or other locality.

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