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RE: Hypotarsus

evelyn sobielski wrote-

Also, am I correct in assuming that a hypotarsus has
to date only been found to occur in Ornithothoraces,
and that it is an autapomorphy in these?

Only in Lectavis and Ornithuromorpha (unknown in Hongshanornis and Archaeorhynchus). Zhou and Zhang believe it's present in the probable enantiornithine Liaoningornis too, but Clarke does not.

Mickey Mortimer