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Re: Mesozoic non-dino papers: marine reptiles, turtles, labyrinthodonts
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- Subject: Re: Mesozoic non-dino papers: marine reptiles, turtles, labyrinthodonts
- From: David Marjanovic <email@example.com>
- Date: Sat, 04 Aug 2012 21:47:55 +0200
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Ylenia Chiari, Vincent Cahais, Nicolas Galtier and Frederic Delsuc
> (2012) Phylogenomic analyses support the position of turtles as the
> sister group of birds and crocodiles (Archosauria). BMC Biology 2012,
> 10:65 (provisional version) doi:10.1186/1741-7007-10-65
> http://www.biomedcentral.com/1741-7007/10/65/abstract NOTE: pdf is
> Open Access
> Abstract (provisional)
> [...] In this study, we used next-generation sequencing to obtain
> seven new transcriptomes from the blood, liver, or jaws from four
> turtles, a caiman, a lizard, and a lungfish.
Nice, but a larger taxon sample couldn't hurt, in particular three
lissamphibians, more squamates (in particular a gecko and a dibamid),
and a tuatara...
The use of more simplistic models of nucleotide substitution for both
> concatenation and species tree reconstruction methods leads to the
> artefactual grouping of turtles and crocodiles, most likely because
> of substitution saturation at third codon positions.
Relaxed molecular clock methods estimate the divergence between
> turtles and archosaurs around 255 million years ago.
Good, this puts that divergence right into the extremely diapsid-poor
Late Permian! Much better than the mid-/late Triassic estimates of
I'll have to download and read all three turtle papers.
> I. V. Novikov (2012) New data on trematosauroid labyrinthodonts of
> Eastern Europe: 4. Genus Benthosuchus Efremov, 1937. Paleontological
> Journal 46(4): 400-411 DOI: 10.1134/S0031030112040089
> The trematosauroid genus Benthosuchus Efremov, 1937 is revised and
> its diagnosis is emended. This genus includes the previously
> established B. sushkini, B. korobkovi, and B. bashkiricus, and the
> new species B. gusevae described here. The new form is archaic
> relative to congeners and is similar in a number of characters to the
> archaic capitosaurid Wetlugasaurus samarensis, which confirms direct
> affinity of the two genera.
Well, yes. *Wetlugasaurus* has been a textbook trematosauroid since at
least 2000. It is, sadly, entirely possible that nobody in Russia has
had the money to acquire this (Western) literature.