Shared characteristics that define a cladistic grouping.
An apomorphy (derived or specialised character) shared by two or more groups which originated in their last common ancestor (from the Greek words apo = from and morphy = shape).
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Example Usage of Synapomorphies
jordanchapman: Homoplasy is random and the phylogenetic signal will prevail even if homoplastic character-states vastly outnumber Synapomorphies
dunBSme: Going over Synapomorphies and symplesiomorphies
