synapomorphy
nounEtymology From syn- + apomorphy.
1
A derived trait that is shared by two or more taxa of shared ancestry.
- Another supposed synapomorphy of Rhamporhynchidae + Pterodactyloidea presented by Unwin (1995) is the subequal length of metacarpals I–III. In all non-pterodactyloid specimens where this region is known metacarpals I–III are about the same length. Therefore this feature cannot be used as a synapomorphy of Rhamporhynchidae + Pterodactyloidea.2003, Eric Buffetaut, Jean-Michel Mazin, Evolution and Palaeobiology of Pterosaurs, page 117:
- A “synapomorphy” for a group then amounts to a state change in a character along the corresponding branch; some synapomorphies may be ambiguous when optimization is ambiguous and multiple MPRs exist.2022, Pablo A. Goloboff, From Observations to Optimal Phylogenetic Trees: Phylogenetic Analysis of Morphological Data, Vol. 1:
- Antonyms
- plesiomorphy
- Derived terms
- synapomorphic
- Related terms
- autapomorphy, symmorphy