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Re: Rép : Post–K-Pg Radiation of Placentals -- open access!!!
I'm planning to write a review of this paper once I've finished reading
the so-called supplementary information. However, as has been mentioned,
it's a book of 131 pages, so I haven't had time to read more than half
of it yet!
But the really important thing is that the "paper" behind the paywall
is, in reality, just an extended abstract. It presents the showiest
results and has all the pretty pictures, but that's it. The _entire_
"materials and methods" section is in the allegedly supplementary
In a comical turn, this "supplementary" information has _its own_
supplementary information ("appendices S1 to S4"), which isn't even
hosted on sciencemag.org, but on morphobank.org!
Do you realize what all this means, dear colleagues, laddies and
It means THIS IS AN OPEN-ACCESS PAPER!
Here you go:
Then cackle madly and click on "download supplement"!
(As an aside, if the very Late Cretaceous mammal _Protungulatum
> coombsi_ belongs in the genus _Protungulatum_, then based on the
> published phylogeny, this pushes back the origin of crown placentals
> into the Mesozoic. But the Supplementary Material is skeptical
> regarding _coombsi_ being bona fide _Protungulatum_.)
In particular, *P. coombsi* is known only from "the tooth, the whole
tooth, and nothing but the tooth", so its affinities are difficult to
_Protungulatum donnae_ is not actually "new"; it was named in 1965.
As its name indicates, it was immediately thought to be "the first
ungulate". It was also thought to be Cretaceous in age for a long time.
At last year's SVP meeting, during a discussion of the age of
*Purgatorius*, Bill Clemens recited "the four horsemen of the
apocalypse": "*Protungulatum*, *Oxyprimus*, *Mimatuta*, *Baioconodon*!"
They show up immediately after the boundary in western North America and
must have immigrated from elsewhere, in keeping with the statement by
O'Leary et al. that the repopulation of North America must have been
accomplished by "immigration from refugia".
Tarsal bones referred to this critter indicate it was terrestrial
> (in keeping with euungulate affinities).
Warning: mammalologists are usually happy to refer isolated tarsals to
taxa otherwise known only from isolated teeth if they have the expected
size. The relationship between tooth size and the sizes of various
tarsal bones is apparently well known and fairly constant, so this is
less scary than it sounds like; but there are bound to be occasions
where this practice puts the LOL in mammalology.
The superficially shrew-like "placental ancestor" depicted in the
> article was inferred by the Science study to be scansorial (probably
> primitive for crown therians, i.e. placentals + marsupials). It's
> interesting to contemplate that therians became scansorial and
> arboreal at about the same time (or likely before) theropods are
> inferred to have headed into the trees. Coincidence?
The dryolestidan *Henkelotherium* was also arboreal or scansorial. But I
don't think dryolestidans are known from before the Middle, perhaps even