In phylogenetics, a plesiomorphy (“near form”) is an ancestral character state. A symplesiomorphy ( from syn- “together”)[3] is a plesiomorphy shared by two or more taxa (including taxa earlier in the clade). Pseudoplesiomorphy is any trait that can neither be identified as a plesiomorphy nor as an apomorphy.[4]
Alternative terms are plesiomorphic character and symplesiomorphic character respectively, or plesiomorphic trait and symplesiomorphic trait respectively.
The term symplesiomorphy was introduced in 1950 by German entomologist Willi Hennig.
https://en.wikipedia.org/wiki/Plesiomorphy_and_symplesiomorphy
Above. Type O Negative - Anesthesia
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