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Re: (origin of the palaeognathous palate)
> However, the rhea [...] DNA studies reveal that
> he is more closely related to the ostrich than the emu.
No longer.
Alan Cooper, Carles Lalueza-Fox, Simon Anderson, Andrew Rambaut, Jeremy
Austin & Ryk Ward: Complete mitochondrial genome sequences of two extinct
moas clarify ratite evolution, Nature 409, 704 -- 706 (8 February 2001)
With tinamous and chicken as outgroups:
--+--*Rhea*
`--+--+--*Emeus* (a moa)
| `--*Dinornis* (another moa)
`--+--*Struthio* (ostrich)
`--+?--*Mullerornis* (Aepyornithidae)
|--*Apteryx* (kiwi)
`--+--*Casuarius* (cassowary)
`--*Dromaius* (emu)