Interordinal relationships of birds and other reptiles based on whole mitochondrial genomes.

@article{Mindell1999InterordinalRO,
  title={Interordinal relationships of birds and other reptiles based on whole mitochondrial genomes.},
  author={David P. Mindell and Michael D. Sorenson and Derek E. Dimcheff and Masami Hasegawa and J C Ast and T Yuri},
  journal={Systematic biology},
  year={1999},
  volume={48 1},
  pages={
          138-52
        }
}
Several different groups of birds have been proposed as being the oldest or earliest diverging extant lineage within the avian phylogenetic tree, particularly ratites (Struthioniformes), waterfowl (Anseriformes), and shorebirds (Charadriiformes). Difficulty in resolving this issue stems from several factors, including the relatively rapid radiation of primary (ordinal) bird lineages and the lack of characters from an extant outgroup for birds that is closely related to them by measure of time… 

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