If you’ve been following the evolution blogs, you’ll know that the wonderful primate fossil Darwinius masillae was touted by its discoverers (and by the book The Link) as a key “transitional form” in human evolution: a link between the two major branches of primate evolution, the anthropoids on one hand and the lemurs and lorises on the other.  Many bloggers who read the initial paper were dubious, asserting that the phylogenetic analysis was too sketchy to put Ida in this position (see here, here, here, and here).  I’m not a paleontologist, but agreed with the criticism that Ida’s placement as a “missing link” was premature.

Well, it looks as if the bloggers were right and the scientists who wrote up Ida were wrong.  A paper in today’s Nature describes a new fossil (Afradapis) from Egypt that appears to be in the same clade (single-origin group of related species) as Darwinius.  The paper is full of technical detail, but the upshot is this:  the dental and jaw features of Darwinius (and Afradapis) that made her discoverers group her with anthropoid apes are probably not homologous to those of anthropoid apes, but convergent (i.e., the traits don’t show that Ida belongs with the anthropoids; instead, these features evolved at least twice in two unrelated groups).  As the authors say:

It has long been known that some adapiform lineages evolved derived morphological features that are also seen in living and extinct anthropoids (for example, fused mandibular symphyses, upper canines with mesial grooves, enlarged and spatulate upper and lower incisors, short and tall rostra)16. The phylogenetic significance of these features has been a source of ongoing debate for decades. Of all known fossil prosimians (including Darwinius), Afradapis provides perhaps the most detailed examples of derived anthropoidlike adaptations in its dental and mandibular morphology. As isthe case for many of the morphological features that some have argued link adapiforms to anthropoids, however, the anthropoid-like features of Afradapis (fused mandibular symphysis with transverse torus, deep mandibular corpus, deep masseteric fossa, large upper molar hypocones, absence of P2/2 and presence of an enlarged P3 with a honing facet for the upper canine) are not present in the most primitive undoubted fossil anthropoids, such as Biretia and Proteopithecus, indicating that the features are likely to have been acquired through convergent evolution.

In the end, both Afradapis and Darwinius appear to belong to the group of primates known as adapiforms, a group that went extinct without leaving descendants.  For all its beauty, then, the Darwinius fossil is not a link to any living species.

There is lots of publicity about this new finding: see the Times online commentary by Brian Switek,  another Times piece by Brian Henderson, and a piece in The Guardian.  It’s refreshing to see the refutation of hyped-up claims about science given as much space as the original hype. Let’s hope that American papers such as The New York Times follow suit.

Curiously, today two “formal corrections” appeared in the PLoS paper. The first says this, in part:

The following subsection should be added beneath the Methods subsection “Terminology”:

Nomenclatural Acts

The electronic version of this document does not represent a published work according to the International Code of Zoological Nomenclature (ICZN), and hence the nomenclatural acts contained herein are not available under that Code from the electronic edition. A separate edition of this document was produced by a method that assures numerous identical and durable copies, and those copies were simultaneously obtainable (from May 21st 2009) for the purpose of providing a public and permanent scientific record, in accordance with Article 8.1 of the Code. The separate print-only edition is available on request from PLoS by sending a request to PLoS ONE, 185 Berry Street, Suite 3100, San Francisco, CA 94107, USA along with a check for $10 (to cover printing and postage) payable to “Public Library of Science”.

Presumably PLoS One is not considered a valid venue for publishing descriptions of new species.  Does this have something to do with its less-then-complete peer review?

The second correction is this:

The authors have supplied an updated Competing Interests statement, which reads as follows:

The authors wish to declare, for the avoidance of any misunderstanding concerning competing interests, that a production company (Atlantic Productions), several television channels (History Channel, BBC1, ZDF, NRK) and a book publisher (Little Brown and co) were involved in discussions regarding this paper in advance of publication. However, to clarify, none of the authors received any financial benefit from any of these associations and these organizations had no influence over the publication of this paper or the science contained within it. The Natural History museum in Oslo will receive some royalty from sales of the book, but no revenue accrues to any of the scientists. In addition, the Natural History Museum of Oslo purchased the fossil that is examined in this paper, however, this purchase in no way influenced the publication of this paper or the science contained within it, and in no way benefited the individual authors.

This is a tad disingenuous, since “benefit” to scientists includes far more than money: it includes (or included) all the hype and buzz around the initial description of Ida as a “missing link” — publicity that of course redounds to a scientist’s career.  And, of course, money that goes to the Museum of Oslo also benefits any author associated with that Museum, even if he/she doesn’t get the dosh directly.

h/t:  Greg Mayer and Daniel Matute

__________________

Erik R. Seiffert, Jonathan M. G. Perry, Elwyn L. Simons & Doug M. Boyer. 2009.  Convergent evolution of anthropoid in Eocene adapiform primates.  Nature 461:118-1122.

Oh dear, the Twins have got their knickers in a twist again about my review in Science of their book.   As is their wont, they mostly argue from authority, dragging in as many like-minded people as they can find.

I’m not impressed, and absolutely stand by my review and its conclusion that Unscientific America is “shallow and unreflective.”  I don’t intend to argue further about this, as I’ve become convinced that in their desperation to show that their book is really good despite widespread criticism of it,  the Twins seem to have become intellectually dishonest.  One of many examples is their citing Robert Wright’s beef against my New Republic review of his book The Evolution of God, which they do to prove that I habitually misrepresent the books I review.  Yet they fail to mention my long response to Wright, showing that his beef turns out to be thin gruel.  (See a shorter give-and-take here.) So it goes.

Anyway, Jason Rosenhouse dismantles the Twins’ Big Whine over at EvolutionBlog.

They finally made it to my town, and you can see the product at Lasalle and Grand:

My only question is:  why are billboards like this so controversial? It’s as if many people can’t abide the idea that atheists can be moral.  Denying this message is about as smart as denying evolution.

The Chicago Tribune has a piece on the billboard.

When I say that Guatemala is a colorful country, I mean that literally. The descendants of the Maya pride themselves on their weaving, and the women turn out in the most elaborate and wonderful clothes.  I am not at all an expert on this topic, but thought I’d post some of my pictures here, accompanied by what little I know about the weaving.

First: what it’s like in a real Guatemalan market.  This is market day in the town of Solola, near the town of Panajachel, on Lake Atitlan.  “Pana” is touristy, but the market is not, probably because it sells basics for locals rather than trinkets. In my several hours in the Friday market (the locals always wear their finest on market day), I saw not one other tourist.  (Click on the photos to see detail of the clothes.)

Traditionally each village had its own design of women’s blouse (the huipil), so you could instantly identify her residence from her clothes.  This appears to be disappearing.  The three women below sport different designs, but I have no idea if they’re from the same place:

These women, however, are wearing the traditional huipil of Solola:

The men of Solola are unusual in still retaining woven rather than European-derived clothes, although the style clearly comes from ladinos.  These are the famous “space cowboy” clothes (also called “bat suits”) of males from the village. The apron is Mayan:

It’s clear from Mayan drawings that weaving of colored cotton clothes has been a going concern for over a thousand years. And the method of weaving has remained largely identical.  Women weave their squarish tops, or huipiles, on a backstrap loom, a small portable loom that’s fastened around the waist. Here’s a photo of one (not my picture):

Traditionally, each woman wove her own outfit, although this tradition is disappearing.  The huipil is often complemented by a head-cloth (also woven on the backstrap) and by a tie-dyed skirt (this technique was independently invented in India and Indonesia). Tie-dyed items are woven by men on the more recently invented treadle loom.  Note that since many weavers cannot read (a situation that is changing), all of these patterns are passed on by learning, and are kept in the head.  There are no written instructions!

Here are some huipiles I photographed in private homes and in the Ixil Textile Museum in Guatemala City:

This geometric design, with animals, is my favorite; it comes from the regions of Guatemala where the language Ixil is spoken:

One way to display your collection:

Some details.  The flowery design is perhaps the most famous in Guatemala, and comes from the village of San Antonio Aguas Calientes, near Antigua:

And in case you’d like to buy a weaving, you’ll need a lot of time to choose your style and bargain for it.  Here’s one stall in the Antigua market.  Prices are reasonable: huipiles start at about eighteen dollars (150 quetzales), and go way high, especially for older designs and those made with silk or natural dyes.  Considering the time taken to create these garments, that’s a real bargain.

The weavings of Guatemala, and the hospitable people who wear them,  are two of the many attractive things about the country.  In the next couple of days I’ll describe the biology and the landscape.

You’re gonna have to wait until I recover before I can produce anything intellectually substantive!  In the meantime, the San Diego Zoo continues to post videos of its panda cub undergoing medical investigation.

At the Reserva Natural Atitlán in Panajachel, Guatemala.