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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.
Source: wiktionary
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.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.