cladistics
a method used by systematists to determine evolutionary relationships. The distribution of shared derived characters (synapomorphies) is used to test relationships and taxa can thus only be defined by genealogy or descent. Relationships of taxa are presented as cladograms, q.v. The number of characters used is important as the best cladogram will be one supported by the most characters. Characters should be independent of one another so that they are not redundant (expressing the same character state in a different fashion, e.g. large eye and small snout may not be independent as a large eye in a head of uniform size may be larger at the expense of snout length). Each cladogram is a hypothesis subject to testing and rejection. Also called cladism or phylogenetic systematics

Dictionary of ichthyology. 2009.

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  • cladistics — systematic classification of life forms, 1965; see CLADISM (Cf. cladism) (also see ICS (Cf. ics)) …   Etymology dictionary

  • cladistics — [klə dis′tiks] n. a method of classifying living organisms, often using computer techniques, based on the relationships between phylogenetic branching patterns from a common ancestor: also cladism [klad′iz΄əm] …   English World dictionary

  • Cladistics — For the scientific journal, see Cladistics (journal). Part of a series on Evolutionary Biology …   Wikipedia

  • cladistics — noun plural but singular in construction Date: 1965 a system of biological taxonomy that defines taxa uniquely by shared characteristics not found in ancestral groups and uses inferred evolutionary relationships to arrange taxa in a branching… …   New Collegiate Dictionary

  • cladistics — cladistic, adj. cladistically, adv. /kleuh dis tiks/, n. Biol. (used with a pl. v.) classification of organisms based on the branchings of descendant lineages from a common ancestor. [1965 70; cladist(ic) (see CLAD , ISTIC) + ICS] * * * …   Universalium

  • cladistics — noun /kləˈdɪs.tɪks/ An approach to biological systematics in which organisms are grouped based upon synapomorphies (shared derived characteristics) only, and not upon symplesiomorphies (shared ancestral characteristics) …   Wiktionary

  • cladistics — n. classification of organisms based on common ancestry (Biology) …   English contemporary dictionary

  • cladistics — [klə dɪstɪks] plural noun [treated as sing.] Biology a method of classification of animals and plants into groups based on characteristics which originated in a common evolutionary ancestor. Derivatives cladism kladɪz(ə)m noun cladistic adjective …   English new terms dictionary

  • cladistics —   Method of classification that groups taxa hierarchically and parsimoniously into nested sets according to their synapomorphies; output is conventionally presented in the form of a cladogram …   Expanded glossary of Cycad terms

  • cladistics — cla·dis·tics …   English syllables

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