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Re: [dinosaur] Smilodon and dire wolf injuries + shared genes favor crocodiles and turtles as sister lineages



In response to this...
 
Gesendet: Montag, 10. April 2017 um 18:42 Uhr
Von: "Ben Creisler" <bcreisler@gmail.com>
 
[...]
Xing-Xing Shen, Chris Todd Hittinger & Antonis Rokas (2017)
Contentious relationships in phylogenomic studies can be driven by a handful of genes.
Nature Ecology & Evolution 1, Article number: 0126 (2017)
doi:10.1038/s41559-017-0126
 
[...]
 
News:
 
74 percent of the shared genes favor the hypothesis that crocodiles and turtles are sister lineages while birds are close cousins.
 
 
..., Nick Gardner asks me to forward the following:
=====================================
 
The paper does NOT say that 74% of shared genes support a turtle+crocodile hypothesis. It says the OPPOSITE.
 
On p. 6, it explicitly says "For example, similar to the well-established branch associated with the monophyly of amniotes on the vertebrate phylogeny that we used as a control (Figs 2–4), examination of the evolutionary placement of turtles (Table 1 and Figs 2–4) showed very strong support for the hypothesis that turtles are the sister group to archosaurs (birds + crocodiles). Specifically, the ΔGLS values of 74% (3,466 out of 4,682) of the genes in the data matrix favour this hypothesis over the second best alternative (turtles as sister group to crocodiles) (Supplementary Fig. 2a); the same is true for ΔSLS values (88% or 1,588,738 out of 1,806,035 sites favour turtles as the sister group to archosaurs rather than to just crocodiles; Supplementary Fig. 3b)."