Symplesiomorphy is a character or trait shared by two or more taxa with their earliest common ancestor. Therefore, this type of character is known as ancestral characters as they have been shared through a long evolutionary history. Significantly, plesiomorphy is a situation when a character is not unique to that particular taxa. Symplesiomorphy is the shared plesiomorphy. The main importance of a symplesiomorphic character is that it gives a strong hint about the evolutionary relationship to an earliest common ancestor.
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