- Ancestral or underived character state shared by several members of a monophyletic group that does not define a monophyletic subset of that more inclusive group and has not experienced reversal.
Expanded glossary of Cycad terms . 2014.
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Symplesiomorphy — A symplesiomorphy or symplesiomorphic character is in cladistics a trait which is shared (a symmorphy) between two or more taxa, but which is also shared with other taxa which have an earlier last common ancestor with the taxa under consideration … Wikipedia
symplesiomorphy — a character shared by two or more organisms or groups and inherited from a remote or much earlier common ancestor (shared primitive character). Diagnoses a paraphyletic group … Dictionary of ichthyology
symplesiomorphy — n. [Gr. syn, together; plesios, near; morphe, form] Shared primitive homologous character states; normally used in cladistic taxonomy; see plesiomorphy … Dictionary of invertebrate zoology
symplesiomorphy — … Useful english dictionary
Synapomorphy — In evolutionary biology, a synapomorphy is a derived character state shared by two or more terminal groups (taxa included in a cladistic analysis as further indivisible units) and inherited from their most recent common ancestor. Derived in this… … Wikipedia
Cladistics — For the scientific journal, see Cladistics (journal). Part of a series on Evolutionary Biology … Wikipedia
Distance matrices in phylogeny — Distance matrices are used in phylogeny as non parametric distance methods were originally applied to phenetic data using a matrix of pairwise distances. These distances are then reconciled to produce a tree (a phylogram, with informative branch… … Wikipedia
Maximum parsimony (phylogenetics) — Parsimony is a non parametric statistical method commonly used in computational phylogenetics for estimating phylogenies. Under parsimony, the preferred phylogenetic tree is the tree that requires the least evolutionary change to explain some… … Wikipedia
Clade — For other uses, see Clade (disambiguation). Cladogram (family tree) of a biological group. The red and blue boxes represent clades (i.e., complete branches). The green box is not a clade, but rather represents an evolutionary grade, an incomplete … Wikipedia
Paraphyly — A cladogram showing a hypothetical descent from an ancestor species of the clade vertebrata. Note that cladograms do not necessarily correspond to taxonomic classifications. In this one, Sauropsida are a paraphyletic group. It can be made… … Wikipedia