Posts Tagged ‘history of science’

Woah.

April 1, 2008

Crazy story in Science Daily today about a paper recently published in the Bulletin of the Society of Historical Integrative Tautology. The paper describes Protardosuchus incendiensis, an extinct fossil reptile whose remains were recently discovered in Holocene beach sands outside San Francisco.

The authors suggest that the strange hollow, procumbent dentition were able to expel a pair of reactive fluids which, when mixed together in the presence of atmospheric oxygen would combust. Abundant charcoal in the beach sediments which yielded the sub-fossil are seen as strong circumstantial evidence for this novel adaptation.

Some carabid beetles have developed a similar, though scaled down chemical defense mechanism while among reptiles, a number of species of cobra can spray venom from their fangs. Protardosuchus’ pyrotechnic display was apparently far more impressive. As the Science Daily piece notes, the author’s aren’t certain if this behavior was defensive or related to prey-capture:

“Seriously, dude we have no effing clue,” says Melchior Neumayr, lead researcher on the new study. “It was probably all like ‘fffshhhh’ and then all like ‘BOUSCH!’ And then, then you’re like totally toast brohan. No thanks man, thanks, but no thanks.”

Most interestingly, this discovery marks the first post-Cretaceous occurrence of a hellasaurid hellasauroid hellasauriform in North America (while most authorities consider “Ogopogo” to be a “hellasaur” sensu lato, it’s almost certainly not a true hellasauroid). It’s tempting to imagine that the mythical “dragons” of Eurasian folklore were inspired by extinct old-world protardosuchians whose remains have yet to be discovered. In fact this pan-Pacific distribution would almost certainly confirm McCarthy’s (2003) argument that the Pacific basin didn’t open until the Mesozoic. Dude, seriously.

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An artist’s reconstruction of Protardosuchus.
Refs:
Dennis McCarthy (2003) “The trans-Pacific zipper effect: disjunct sister taxa and matching geological outlines that link the Pacific margins” Journal of Biogeography 30 (10)
Neumayr, M et al. (2008) “Expirational autocombustion in a recently extinct Hellasaur from coastal California” Bull. Soc. Hist. Int. Taut. 56 (9 or 10)

Afrotheres of the World Unite!

February 7, 2008

Afrotheria

The recent description of a new species of sengi, Rynchocyon udzungwensis, inspired me to finally complete a project I’ve been talking about for years. Behold: the official Afrotheria logo–soon to be seen on a bumper-sticker or t-shirt near you!

(Note: while the new sengi is freaking huge, tipping the scales at 700g, the animals in the logo are, um, not to scale).

“Gondwanaism and Afrothereists” is the name of a chapter in my book Paleontology After Modernism which will almost certainly never be written.

I ultimately decided not to include the extinct Afrothere lineages Desmostylians and Embrithopods, despite the fact that they are some of my favorite mammals, because I was afraid it would look too crowded, plus my lab-mates were starting to ask questions.

Anyone who can name all seven taxa pictured will win a free t-shirt, once I get around to printing them…

Props to Seth Newsome for the inspiration.

Now I guess I had better get to designing logos for Xenarthra, Laurasiatheria and Euarchontoglires.

Come Again?

December 20, 2007

Yes, apparently.

Wave Bye-Bye to the Polymath…

December 17, 2007

Well, calling Charles Willson Peale a polymath may be rather generous. Then again, if I had run a failed saddle shop, painted some bossy white dudes, and created the first American Natural History Museum, I think I’d probably feel pretty worthy of the title. Anyway, when was the last time you went to a glass harmonica concert or whatever? [well, knowing microecos readers, it was probably last weekend]

At any rate, before we tossed his geriatric remains from the bell jar, I figured it was worth giving the bloke a proper post. Exhumation of the Mastadon [sic] (1806) (pictured above) remains probably the best American painting to date, though some of Richard Estes’ stuff comes close. That is, of course, ol’ Pealey himself in the jacket and slacks. Much, much more Peale info here.

microecos is a rotting peaty wreck.

Who Is Buried in Lincoln's Tomb?

December 5, 2007

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On February 12th, 1809, two visionaries emerged on opposite sides of the Atlantic. Both were cautious, erudite, soft-spoken men who were destined to transform the world in their own way.

In a letter to Asa Gray Darwin, a self-proclaimed supporter of the Union endorsed Lincoln’s Emancipation Proclamation:

Well, your President has issued his fiat against Slavery—God grant it may have some effect.

I don’t know if Lincoln ever picked up the Origin.

I suppose he was rather busy in the sixties. He is reported to have read (and enjoyed) Robert Chambers’ Vestiges. While this proto-evolutionary text was widely derided by the scientific community (including Darwin himself), it did mark a sincere effort to develop a rational history of life that accorded with the fossil record.

Growing up in Kentucky, it’s almost impossible that a young Abe didn’t encounter some of the abundant Paleozoic fossils that litter the state. And, in keeping with my previous rant about our fossilferous infrastructure, the stone which surrounds Lincoln’s tomb is packed with coral and brachiopod fossils.

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Perhaps it’s no coincidence that Lincoln’s most famous address, delivered amongst fields tilled with fallen soldiers, begins with a declaration of historical context. History helps us to make sense of chaos and savagery of modern life. This is also where Karl Marx and L. R. Hubbard fit in.

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But aside from that, Mrs. Lincoln how was the play?

Decimating Birds: Episode V – Toward a new microethos

November 15, 2007

[Decimating Birds is a fitful series about beautiful birds. We're working on 10. Actually this entry pushes the total to 11, but who's counting? Previous installments are here: i, here: ii, here: iii, here: iv, and here: vi]

5) Fiveway tie:

Small-headed Flycatcher (Muscicapa minuta),

Blue Mountain Warbler (Sylvia montana),

Carbonated Swamp Warbler (Sylvia carbonata),

Cuvier’s Kinglet (Regulus cuvierii),

Townsend’s Bunting (Emberiza townsendi) all nomina dubia

 

Small-headed Flycatcher.

All paintings originally from Audubon’s Birds of North America 1827-1838.

Many of the prints shown are available for purchase at Minnesland.

Blue Mountain Warbler.

Carbonated Swamp Warbler.

Cuvier’s Kinglet.

Townsend’s Bunting.

I have, in fact, a draft screenplay worked up. Ewan McGregor should probably play Alexander Wilson. Audubon is an open call, but I’d be willing to audition Brian Ellis.

Dear Hollywood: trust me, this has A LOT more staying power than Costner’s Kentucky Cycle. But how can you be more beautiful than something that doesn’t exist?

Awful Changes

November 6, 2007

A quiet sigh of relief courtesy of Henry de la Beche:

Awful Changes.

Man found only in a fossil state — Reappearance of Ichthyosauri.

“A change came o’er the spirit of my dream.” Byron

A Lecture. — “You will at once perceive,” continued Professor Ichthyosaurus, “that the skull before us belonged to some of the Lower order of animals the teeth are very insignificant the power of the jaw trifling, and altogether it seems wonderful how the creature could have procured food.”

He goes on, “looking at the finite element model, the weakness across the occipital clearly demonstrates that the species went extinct when their heads exploded while attempting to navigate online forms…”

Here’s the carnage:

How many guilds do you count?

Ussher…He's the one with the band-aid right?

October 24, 2007

While most of us were presumably present at the moment of our own birth, few can honestly say they can clearly recall it.  Even fewer had a good sense of the exact hour or day when this singularly important event took place, at least at the time.

While we tend to take knowledge of our own birthdate for granted (mine’s November 1 by the way, I know you’ve all been trolling my Amazon wishlist), we of course depend upon the memory of other interested parties, namely our parents.  Dial back several centuries or so, and most humans had only a very hazy idea of when the were born perhaps narrowed down to a particular season of a given year.

High-born Europeans, like James Ussher, were better off than most, and we might assume that his literate clerk father is responsible for the unusually exact record we have for Ussher’s birth (see image above).

As Primate of All Ireland, Ussher took it upon himself to calculate the exact birthdate of the Earth using the best documentary accounts of his time.  After considerable scholarly investigation Ussher deduced that the planet was created around nightfall on October 22nd, 4004 BCE.

Hearty chortles across the interweb today in response to the WorldNetDaily piece commemorating the 6010th [sic] birthday of the planet.  Anyone adhering to Ussher’s chronology in 2007 deserves a chortle.

However, it’s important to remember that Ussher himself was working in 1658 well before Jim Hutton, Chas Lyell, or Chuck D.  In building his chronology Ussher attempted to integrate historical records from different cultures across the “Middle East” (what’s the PC term for the fertile crescent anyway?), or what WorldNetDaily hilariously calls “secular sources.”  All hail secular Marduk!

Uh, anyway…go read Steve Gould’s classic “Fall in the House of Ussher” for an excellent account of how the Irish Primate should be a hero for modern academics and not reality-challenged young earthers.

News Flash!

October 12, 2007

Or…another one for the “No Shit Sherlock” file:

Fossil Data Plugs Gaps In Current Knowledge, Study shows

Researchers have shown for the first time that fossils can be used as effectively as living species in understanding the complex branching in the evolutionary tree of life.

I’ll spare Science Daily the usual ire, the story itself is fine although as usual could use a bit more context. Likewise nothing but mad props, as it were, to Andrea Cobbett and co. for an interesting, nuanced paper which appears in a recent edition of Systematic Biology: Fossils Impact as Hard as Living Taxa in Parsimony Analyses of Morphology. I dearly hope their work is taken to heart by neotaxonomists.

I will however shovel multiple cubic acres (following Selach’s conversion [1973] where 1 cubic acre = 75.3 shit tons) of ire upon those “others [who] have been reluctant to use extinct species because the data they offer is often less complete.” …as opposed to the totally fucking comprehended living taxa?

Okay, so maybe we’re tilting at paper tigers, or straw men, or whatever, please don’t break my stride.

As molecular phylogeny was coming into its own surely some smirkholes were predicting that paleontology was entering its autumn at least as a source of evolutionary understanding. No doubt, the alarming number of 0/1 matrices, strict consensuses (man, I really wanted to type “consensi”), and leathery boot straps awaiting me at next week’s SVP are to some extent a direct response to this attitude.

Anyway, I hope those paper tigers are spinning in their effing, i mean fucking, ergonomic office chairs.

Old Chuck D. himself was, as much as we’d like to forget it, a sometime paleontologist. While in South America, en voyage with the Beagle, Darwin made a number of important paleontological discoveries. Per his enumeration:

First, parts of three heads and other bones of the Megatherium, the huge dimensions of which are expressed by its name. Secondly, the Megalonyx, a great allied animal. Thirdly, the Scelidotherium, also an allied animal, of which I obtained a nearly perfect skeleton. It must have been as large as a rhinoceros: in the structure of its head it comes, according to Mr. Owen, nearest to the Cape Anteater, but in some other respects it approaches to the armadilloes. Fourthly, the Mylodon Darwinii, a closely related genus of little inferior size. Fifthly, another gigantic edental quadruped. Sixthly, a large animal, with an osseous coat in compartments, very like that of an armadillo. Seventhly, an extinct kind of horse, to which I shall have again to refer. Eighthly, a tooth of a Pachydermatous animal, probably the same with the Macrauchenia, a huge beast with a long neck like a camel, which I shall also refer to again. Lastly, the Toxodon, perhaps one of the strangest animals ever discovered: in size it equalled an elephant or megatherium, but the structure of its teeth, as Mr. Owen states, proves indisputably that it was intimately related to the Gnawers, the order which, at the present day, includes most of the smallest quadrupeds: in many details it is allied to the Pachydermata: judging from the position of its eyes, ears, and nostrils, it was probably aquatic, like the Dugong and Manatee, to which it is also allied. How wonderfully are the different Orders, at the present time so well separated, blended together in different points of the structure of the Toxodon! (1839)

Thanks to Owen that paragraph is laced with the kind of errors that the molecularists have wasted a lot of palm sweat over.  And yet…here we see Darwin starting to gain some FUCKING important insights into biogeography, extinction, mosaic evolution and convergence.

FOSSILS MATTER!

Genomics and the Incognitum

August 16, 2007

Four blind wisemen are examining a skull. The first grasps the tip of the tusk and shouts “it’s a spear!” The second feels the deep concave nasal cavity at the center of the skull and exclaims “no, it’s a cyclops, to be sure!” The third rubs the jagged molar and muses, “cyclopses don’t exist, but surely this was a fearsome carnivore.”

Then the fourth wiseman walks up and lightly taps the tip of the occipital condyle he probes the foramen magnum. Then he draws his finger up and across the low-domed skull and explores the depths of the nasal cavity. He carefully strokes each long conic incisor before moving deeper into jaw.  He traces each cusp and groove along each tooth. After some time, the fourth scientist quietly states, “It’s a proboscidean, specifically an American Mastodon (Mammut americanum) or something like it.”

LOL! Genomics takes the old fable of the blind man and the elephant to heart. Rather than studying genetic information by examining minute bits (like only 10,000 base-pairs or something), or ‘genes’ the genomicists examine entire organimsal genomes, the forest rather than the trees if you’d like (alt. getting complete sets is no mean feat, even from a living organism.

That makes the announcement of the sequencing of an entire Mastodon mitochondrial genome from a tooth wrenched from the Alaskan permafrost totally effing astonishing. And really, really cool. Even better it’s been published in PLoS and is free for all to ponder, ruminate and expound upon.

One application of whole-genome studies is evolutionary comparison between related organisms. In this case, the researchers compared the Mastodon genome with living Asian and African Elephants as well as with the previously published genome similarly ‘back of the freezer’ Mammoths (Mammuthus primigenius). Here’s their tree:

Rohland et al 2007 image links to original, larger version.

The also compared these genomes to elephants’ closest living relatives, Hyraxes and Dugongs (remind me to write about Afrotheria some time…), as well as compared the rate of genetic change in proboscideans with other mammals, including primates.

Snap! (Skull tip to Afarensis)

Hey, what’s that thing by Charles Peale’s foot? A meat grinder? To be continued?