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Re: questions about the Odontochelys study
Was wondering which species the authors used when they say that turtle
blood tests link them with 'diapsids'?
Several. Also, not just any diapsids: either as the sister-group of
Archosauria or as the sister-group of Crocodylia.
And a phylogenetic analysis of sequence data is not a "blood test".
Was wondering which species Rieppel used when he linked turtles to
lepidosaurs or squamates and sauropterygians?
Mostly *Proganochelys*, IIRC.
(Which, incidentally, is not trivial to interpret. Kordikova 2002 claims to
have discovered postparietals and tabulars in the skull, both never seen
before and both supposed to be absent.)
How many millions of years link turtles to their closest known sister
Depends on what those are, obviously. Euryapsids appear sometime around the
Early-Middle Triassic boundary, lepidosaurs in the Middle Triassic,
crown-group archosaurs around the Early-Middle Triassic boundary (probably
earlier), procolophonoids in I think the Late Permian, and pareiasaurs in
the Middle Permian.