synapomorphy(redirected from Synapomorphies)
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Species-specific unique embryologic features.
[syn- + apo- + morph- + -y]
n. pl. synapomor·phies
An evolved character or trait that is shared by two or more taxonomic groups and is considered to have originated in their common ancestor. Hair is synapomorphic for marsupials, primates, and all other taxa that are grouped together in the class Mammalia.