
I missed this one a week or two ago. Simon Conway Morris and his colleague Jean-Bernard Caron published
a paper in Science on a new Cambrian fossil called
Orthrozanclus. The cool thing about the fossil is that it combines features from two other fossils that Conway Morris previously implicated as transitional stem groups between the modern crown groups ("phyla") of mollusks, annelids, and brachiopods:
Wiwaxia and
Halkeria. Of course, according to Discovery Institute propaganda, transitional fossils like this don't exist.
Here is a news summary. See also the
Orthrozanclus post from PZ Myers, his
post last year on another stem group mollusk-ish critter,
Odontogriphus.
24 Comments
PvM · 15 April 2007
Henry J · 15 April 2007
Re "when discussing the origin of major body plans, it is likely that the genetic and morphological gaps in the Cambrian were much smaller than the present disparity of phyla would suggest."
Isn't that also a direct prediction of the current ToE? (I.E., If the data said otherwise the theory would have a problem.)
Henry
djlactin · 16 April 2007
as nick mentioned in a post a few days ago, the 'origin' of a new higher taxon would appear at the time to be just another speciation event. i'm pretty sure that the debate over what phylum to put these critters in simply reflects our post-hoc examination. perhaps at the time, they had diverged only to family (or less?) level, and our procrustean (thanks for the adj., SJ Gould!) efforts to assign them into one or the other phylum fails because they did not (yet) belong exclusively to one or the other.
kay · 16 April 2007
But it's still a....
... no, actually, what the hell is that thing? :)
The Sanity Inspector · 16 April 2007
It looks like those things I used to comb out of my dog's fur, after a romp in the meadow.
FastEddie · 16 April 2007
How come the Discovery Institute never, well, discovers anything like this?
George Cauldron · 16 April 2007
John Vreeland · 16 April 2007
John Krehbiel · 16 April 2007
This reminds me of an argument in which a creationist tried to tell me that remote ancestors of horses weren't "really" horse ancestors becasue they are also ancestors of rhinoceroses. "So which is it? A horse or a rhino?"
fnxtr · 16 April 2007
So your grandfather isn't really your ancestor because he's also your cousin's grandfather. Well, which is he, you or your cousin?
CJColucci · 16 April 2007
Two more gaps in the fossil record to explain.
CJColucci · 16 April 2007
Ah ha! Two MORE gaps in the fossil record.
David Stanton · 16 April 2007
Oh yeah, well if you and your cousin have the same grandmother, why is your grandmother still around? How many gaps is that?
Henry J · 16 April 2007
Re "You'd think they'd have found some bunnies in the Precambrian by now."
Yeah, where's Elmer Fudd when they need him?
JohnW · 16 April 2007
Peter Henderson · 16 April 2007
Jeffrey K McKee · 16 April 2007
Just to reiterate two important points: All fossils are transitional fossils. All species are transistional species, including our own.
Flint · 17 April 2007
FastEddie · 17 April 2007
Look, another neat discovery NOT made by the Disgusting Institute:
"Something old is now something new, thanks to Lamar University researcher Jim Westgate and colleagues. The scientists' research has led to the discovery of a new genus and species of primate, one long vanished from the earth but preserved in the fossil record."
http://www.sciencedaily.com/releases/2007/04/070409161526.htm
Henry J · 17 April 2007
Re "But it's still a....... no, actually, what the hell is that thing? :)"
The common ancestor of modern dust bunnies?
Jeffrey K McKee · 17 April 2007
*sigh* to Flint
Yes, extinction is one form of transition, and perhaps the dominant one. Note the difference, however, between terminal extinctions (read robust australopithines in the paleaoanthropology world) versus transitional extinctions (e.g., in most academic circles, Homo habilis (sensu lato) to Homo erectus (sensu lato).
Sir_Toejam · 18 April 2007
Vietnam travel · 2 May 2007
Your post's very good. I like it.
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http://www.vietnam-travelinfo.com/
ABS · 16 October 2008