New information on the integumentary ornamentation of Aquilops americanus (that I have on my shoulder)
June 14, 2015
BUT it’s waaay too detailed for a tattoo unless I wanted a full back piece. I sent Brian this sketch to convey what I wanted – to emphasize the strong lines of the piece, punch up the spines and spikes, basically shift it toward a comic book style without devolving into caricature:
Originally I was going to have Aquilops‘ name and year of discovery in the tat. I decided to drop the lettering, for several reasons. One, it won’t hold up as well over the next few decades. Two, if someone is close enough to read it, we’ll probably be talking about the tattoo already. Third, the tattoo is a better conversation starter without a caption. First I get to tell people what Aquilops is, then I get to explain what ‘fourth author‘ means. ;-)
As he did for the original Aquilops head recon, Brian sent a selection of possible color schemes, mostly based on those of extant lizards. I couldn’t decide which I liked best, so I talked it over with my tattoo artist, Tanin McCoe at Birch Avenue Tattoo in Flagstaff, Arizona. I wasn’t just interested in what looks good on paper, but what would work well with my skin tone and still look good 20 years from now. Tanin really liked the earth-tone color scheme with the dark stripe across the eye, so that’s how we went. The tattoo Aquilops is facing left instead of right because it’s on my left shoulder – my right deltoid was already occupied.
They do good work at Birch Avenue – Vicki’s gotten three pieces there, including this skeleton key that was also done by Tanin:
Yes, the key’s bit is a human sphenoid – that was my idea.
Anyway, I’m super-happy with the tattoo, and I’m glad it’s healed enough to show off. Thanks, Brian and Tanin!
June 12, 2015
The longest cell in Andy Farke is one of the primary afferent (sensory) neurons responsible for sensing vibration or fine touch, which runs from the tip of his big toe to his brainstem. (NB: I have not actually dissected Andy to confirm this, or performed any viral neuron tracing on him, this is assumed based on comparative anatomy.) Here’s a diagram:
This is what happens when (a) I need to create a diagram to illustrate the longest cell in the human body for my students, and (b) my friends put stuff online with a CC-BY license.
Found this while I was checking out Aquilops art online:
From there it was pretty straighforward to mash up Andy’s silhouette with the nerve stuff from Wedel (2012: fig. 2).
So if you want the full deets on licensing – which I am obligated to provide whether you want them or not – the image up top is a derivative image by me, based on work by Andy published at PhlyoPic under the Creative Commons Attribution 3.0 unported (CC-BY 3.0) license, and based on my own image published in Acta, also under a CC-BY license.
If you’d like to know more about the science behind very long nerves in vertebrates, please see these posts:
- The world’s longest cells? Speculations on the nervous systems of sauropods
- Oblivious sauropods being eaten
Also, keep making stuff and putting it online under a license people can actually use. It’s beneficial for science and education, and hugely entertaining for me.
June 12, 2015
I was contacted recently by David Goldenberg (email@example.com), a journalist who’s putting together a piece on the biggest dinosaurs. He asked me a few questions, and since I’d taken the time to write answers I thought I may as well post them here.
1) Do you think that we will ever know what the largest dinosaur (by mass) was?
In principle, we can never know that we’ve found the largest dinosaur. All we can know (and we probably can’t really know even this, as we’ll see below) is that we’ve found the largest so far. If we were dealing with animals where there’s a good sample size, there would be statistical techniques that we could use to figure out the likely size-range. But most giant dinosaur species are known only a handful of specimens — sometimes only a single one. How big did Puertasaurus get? We can’t possibly say: the best we can do is estimate how big the one known specimen of Puertasaurus was.
That said, we can sort of get a feel for size classes. There are quite a few sauropods that seem to come in at around 30-40 tonnes — Brachiosaurus, Giraffatitan, Supersaurus, Dreadnoughtus — which suggests there might be some kind of a limit there. But there are bigger titanosaurs (Argentinosaurus, Puertasaurus, Futalognkosaurus) which show that if the barrier exists at all, it’s a “soft” one. And of course the tantalising hints of super-giant sauropods.
There are at least three of these: Amphicoelias fragillimus, a diplodocid known from a drawing of a vertebral arch which has since been lost or destroyed, which could well have massed 100 tonnes. Bruhathkayosaurus, a giant titanosaur known from a two-meter tibia, since destroyed, which could conceivably have massed twice that; and the Broome Sandstone track-maker, known only from footprints, which might have been somewhere in between.
Any one of those, we might write off and say it’s too good to be true — all three stories are pretty vague as to evidence and require a lot of guesswork in the inferences. But the fact that we have all three of these makes me feel pretty certain that there were indeed sauropods out there in the 100-200 tonne range (i.e. the size of big whales). I only hope we find solid, verifiable, curated evidence for them some time soon.
2) What bones do you need to have before you can make an accurate measurement?
You can’t ever make an accurate measurement. Consider even a really well represented, essentially complete specimen such as MB.R.2181 (previously known as HM S II), the giant mounted skeleton in the Museum für Naturkunde Berlin. Peer-reviewed published estimates of the mass of that one individual have varied between 13,618 and 78,258 kg — a factor of 5.75. Even if you discard these obvious outlier estimates, recent and credible estimates vary from 23,337 to 38,000 kg, which is still a factor of 1.63.
And this is not completely crazy. Two humans with essentially identical skeletons can weigh 70 and 114 kg, after all. Soft tissue is essentially impossible to predict.
3) What do you make of the fact that so many different species have been given the title? Is that the fault of the media or scientists or what?
A big part of is that it depends on what you count. That Berlin brachiosaur is the biggest dinosaur known from an essentially complete skeleton, so Giraffatitan is a legitimate holder of the crown. (Confusing matters further, it used to be thought to be a species of Brachiosaurus). But there were definitely bigger sauropods than that — just not known from such complete specimens. Argentinosaurus was certainly bigger, for example. But there’s no way to put a meaningful whole-body mass estimate on it.
But yes, there is also an understandable tendency towards sensationalism, both from scientists and the press. There have been plenty of new discoveries that can legitimately be described as “could be the biggest yet”.
June 11, 2015
We as a community often ask ourselves how much it should cost to publish an open-access paper. (We know how much it does cost, roughly: typically $3000 with a legacy publisher, or an average of $900 with a born-open publisher, or nothing at all for many journals.)
We know that peer-review is essentially free to publishers, being donated free by scholars. We know that most handling editors also work for free or for peanuts. We know that hosting things on the Web is cheap (“publishing [in this sense] is just a button“).
Publishers have costs associated with rejecting manuscripts — checking that they’re by real people at real institutions, scanning for obvious pseudo-scholarship, etc. But let’s ignore those costs for now, as being primarily for the benefit of the publishers rather than the author. (When I pay a publisher an APC, they’re not serving me directly by running plagiarism checks.)
The tendency of many discussions I’ve been involved with has been that the main technical contribution of publishers is the process that is still, for historical reasons, known as “typesetting” — that is, the transformation of the manuscript from from an opaque form like an MS-Word file (or indeed a stack of hand-written sheets) into a semantically rich representation such as JATS XML. From there, actual typesetting into HTML or a pretty PDF can be largely automated.
So: what does it cost to typeset a manuscript?
First data point: I have heard that Kaveh Bazargan’s River Valley Technologies (the typesetter that PeerJ and many more mainstream publishers use) charges between £3.50 and £9 per page, including XML, graphics, PDF generation and proof correction.
Second data point: in a Scholarly Kitchen post that Kent Anderson intended as a criticism of PubMed Central but which in fact makes a great case for what good value it provides, he quotes an email from Kent A. Smith, a former Deputy Director of the NLM:
Under the % basis I am using here $47 per article. John [Mullican, a program analyst at NCBI] and I looked at this yesterday and based the number on a sampling of a few months billings. It consists on the average of about $34-35 per tagged article plus $10-11 for Q/A plus administrative fees of $2-3, where applicable.
Using the quoted figure of $47 per PMC article and the £6.25 midpoint of River Valley’s range of per-page prices (= $9.68 per page), that would be consistent with typical PMC articles being a bit under five pages long. The true figure is probably somewhat higher — maybe twice as long or more — but this seems to be at least in the same ballpark.
Third data point: Charles H. E. Ault, in a comment on that Scholarly Kitchen post, wrote:
As a production director at a small-to-middling university press that publishes no journals, I’m a bit reluctant to jump into this fray. But I must say that I am astonished at how much PMC is paying for XML tagging. Most vendors looking for the small amount of business my press can offer (say, maybe 10,000 pages a year at most) charge considerably less than $0.50 per page for XML tagging. Assuming a journal article is about 30 pages long, it should cost no more than $15 for XML tagging. Add another few bucks for quality assurance, and you might cross the $20 threshold. Does PMC have to pay a federally mandated minimum rate, like bridge construction projects? Where can I submit a bid?
I find the idea of 50-cent-per-page typesetting hard to swallow — it’s more than an order of magnitude cheaper than the River Valley/PMC level, and I’d like to know more about Ault’s operation. Is what they’re doing really comparable with what the others are doing?
Are there other estimates out there?
In my blog-post announcing Haestasaurus as the new generic name for the misassigned species “Pelorosaurus” becklesii, I briefly surveyed the three phylogenetic analyses in the paper. Of the third — the one based on the Mannion et al. (2013) Lusotitan matrix using both discrete and continuous characters — I wrote that it …
… recovers Haestasaurus as a titanosaur — as sister to Diamantinasaurus and then Malawisaurus, making it a lithostrotian well down inside Titanosauria.
My mistake! I was working from the result of an earlier version of that analysis. In the final version included in the paper, things are rather different:As you can see, Haestasaurus is indeed a titanosaur in this analysis — but not a derived one at all. In fact, it’s part of the most basal clade of titanosaurs, along with Janenschia and Dongbeititan. In this tree, we have a really nice, big Brachiosauridae, containing 19 OTUs split fairly evenly between two subclades.
[Side-note: Upchurch et al. (2015) uses phylogenetic definitions that I’m not crazy about. I prefer the arrangement that I followed in my brachiosaur paper (Taylor 2009), in which Titanosauriformes = Brachiosauridae + Titanosauria is a node-stem triplet. Hopefully, some time soon, the wretched PhyloCode will finally be implemented, and we’ll be in a position to nail down a single set of definitions for the whole community to use.]
Anyway, the upshot of all this is that all three phylogenetic analyses in the paper return Haestasaurus as a pretty basal macronarian, and on the balance of evidence it’s likely not a titanosaur after all. (That’s the the name “Haestatitan“, which was in some earlier drafts of the paper, was changed to Haestasaurus. Kind of a shame, given how mundane -saurus names are, but probably the wisest course of action.)
What is the takeaway lesson from this? It’s not just “Haestasaurus is not a derived titanosaur”. It’s that all our phylogenetic hypotheses are just that — hypotheses. Papers that publish only a single cladogram are always at risk of being misinterpreted as conveying much more certainty than they really do, and Paul and Phil are to be commended for included the whole messy story in this paper. The position of Haestasaurus shifts around far too easily for us to have a strong sense of what it is, and it’s good that the paper makes that clear.
(It also makes glad that way back in Taylor and Naish (2007), I and Darren didn’t give a more precise position of Xenoposeidon than that it’s probably some kind of neosauropod. And even that is not something I would put money on.)
- Mannion, Philip D., Paul Upchurch, Rosie N. Barnes and Octávio Mateus. 2013. Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms. Zoological Journal of the Linnean Society 168(1):98–206. doi:10.1111/zoj.12029
- Taylor, Michael P. 2009. A re-evaluation of Brachiosaurus altithorax Riggs 1903 (Dinosauria, Sauropoda) and its generic separation from Giraffatitan brancai (Janensch 1914). Journal of Vertebrate Paleontology 29(3):787-806.
- Taylor, Michael P. and Darren Naish. 2007. An unusual new neosauropod dinosaur from the Lower Cretaceous Hastings Beds Group of East Sussex, England. Palaeontology 50(6): 1547-1564. doi:10.1111/j.1475-4983.2007.00728.x
- Upchurch, Paul, Philip D. Mannion and Michael P Taylor. 2015. The Anatomy and Phylogenetic Relationships of “Pelorosaurus” becklesii (Neosauropoda, Macronaria) from the Early Cretaceous of England. PLoS ONE 10(6):e0125819. doi:10.1371/journal.pone.0125819
June 4, 2015
I found myself needing a checklist so that I could make sure I’d updated all the various web-pages that needed tweaking after the Haestasaurus paper came out. Then I thought others might find it useful for when they have new papers. So here it is.
- Write a blog-post on SV-POW!
- Create a new page about paper in the SV-POW! sidebar.
- Add the full-resolution figures to the sidebar page.
- Update my online publications list.
- Update my University of Bristol IR page.
- Update my ORCID page.
- Update my LinkedIn page.
- Mendeley, if you do it (I don’t).
- ResearchGate, if you do it (I don’t).
- Academia.edu, if you do it (I don’t).
- Keep an eye on the new taxon’s Wikipedia page (once it exists).
- Add the paper to the Paleobiology Database (or ask someone to do it for you if you’re not authorised). [Credit: Jon Tennant]
- Tweet about it! [Credit: Matt Hodgkinson]
- Update Google Scholar, if it doesn’t pick up on the publication on its own [Credit: Christopher Taylor]
- Post on Facebook [Credit: Andy Farke]
- Send PDF to the institution that hosts the material [Credit: Andy Farke]
- Email colleagues who might be interested [Credit: Andy Farke]
- Write short popular language account for your institution if applicable [Credit: Andy Farke]
- Submit any silhouettes to PhyloPic [Credit: Mike Keesey]
Have I forgotten any?
I think I have now completed all these tasks for the Haestasaurus paper. And a right pain it was, entering the same new paper in SV-POW!, my own list, the Bristol IR, the ORCID page and LinkedIn.
The IR was definitely by far the clumsiest — it took ages, and many different screens, before I was done. I kind of expected that (it turns out that PURE, which is what Bristol’s IR uses, is supplied by Elsevier, so supply your own punchline). But what really disappointed me was the clumsiness of having to enter all the details by hand yet again when I got to ORCID. Why couldn’t I just enter the DOI and let it fill in the rest?
You would think that ORCID, of all people, would appreciate the value of referring to things by unique IDs!