Navigation Links
Ancient fossils reveal how the mollusc got its teeth
Date:8/22/2012

TORONTO, ON The radula sounds like something from a horror movie a conveyor belt lined with hundreds of rows of interlocking teeth. In fact, radulas are found in the mouths of most molluscs, from the giant squid to the garden snail. Now, a "prototype" radula found in 500-million-year-old fossils studied by University of Toronto graduate student Martin Smith, shows that the earliest radula was not a flesh-rasping terror, but a tool for humbly scooping food from the muddy sea floor.

The Cambrian animals Odontogriphus and Wiwaxia might not have been much to look at the former a naked slug, the latter a creeping bottom-dweller covered with spines and scales. Despite the hundreds of fossil specimens collected from the Canadian Rockies by the Royal Ontario Museum, scientists could not agree whether they represented early molluscs, relatives of the earthworm, or an evolutionary dead-end. Smith, a PhD candidate in Uof T's Department of Ecology and Evolutionary Biology and author of a study published this week in Proceedings of the Royal Society B, employed a new, non-destructive type of Electron Microscopy to reveal the new details.

"I put the fossils in the microscope, and the mouth parts just leaped out," says Smith, a PhD candidate in U of T's Department of Ecology and Evolutionary Biology. "You could see details you'd never guess were there if you just had a normal microscope."

After examining some 300 fossils, Smith was able not just to reconstruct the mouthparts, but work out how they grew. "The fossils are squashed completely flat, which makes them really hard to reconstruct in 3D," says Smith. "I surrounded myself with micrographs of the mouth parts and lumps of plasticine, and spent weeks trying to come up with a model that made sense of the fossils."

The new observations demonstrated that the mouthparts consisted of two to three rows of 17 similarly-shaped teeth, with a symmetrical central to
'/>"/>

Contact: Sean Bettam
s.bettam@utoronto.ca
416-946-7950
University of Toronto
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Melting glaciers, enough sand to bury London, and ancient ecosystem engineering
2. Ancient civilizations reveal ways to manage fisheries for sustainability
3. Ancient whale species sheds new light on its modern relatives
4. Ancient Egyptian cotton unveils secrets of domesticated crop evolution
5. Ammonites found mini oases at ancient methane seeps
6. New coelacanth find rewrites history of the ancient fish
7. LSU research finds orangutans host ancient jumping genes
8. Whale population size, dynamics determined based on ancient DNA
9. Ancient giant turtle fossil revealed
10. Like curry? New biological role identified for compound used in ancient medicine
11. Tongue analysis software uses ancient Chinese medicine to warn of disease
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ancient fossils reveal how the mollusc got its teeth
(Date:9/15/2014)... tropical rainforest teeming with life it,s not what comes ... the first time evidence of Doncaster,s 310-million-year-old past, including a ... mining tip. , Some of the fossilised plants and creatures ... the egg case, several horseshoe crabs and some previously unrecorded ... preserved in rocks that formed within the coal and shale ...
(Date:9/15/2014)... , , , ... , , , , ... own set of symptoms. The finding could be a first... , , ... , , , , ... , , , , , , , New research shows that schizophrenia ...
(Date:9/15/2014)... SANTA BARBARA, Calif. , Sept. 15, 2014 ... Goleta, California , announces the public ... has a very unique, patented product, combining room ... GENiSYSS is the only company to make personal ... Photo - http://photos.prnewswire.com/prnh/20140912/145664   Photo ...
Breaking Biology News(10 mins):'Jaws' lived in Doncaster 2Schizophrenia not a single disease but multiple genetically distinct disorders 2Schizophrenia not a single disease but multiple genetically distinct disorders 3Schizophrenia not a single disease but multiple genetically distinct disorders 4Schizophrenia not a single disease but multiple genetically distinct disorders 5GENiSYSS Launches Website about Easy, Inexpensive Home DNA Storage for Everyone 2
... Scientists at Barrow Neurological Institute have recently made discoveries about ... central nervous system (CNS) a finding that could have ... multiple sclerosis. The research, led by Barrow,s Fu-Dong Shi, MD, ... Journal of Experimental Medicine , and simultaneously highlighted in ...
... The availability of highly nutritious forage is one of ... in western Oregon and Washington, according to a modeling ... Service,s Pacific Northwest (PNW) Research Station. Findings from the ... planning for the ecologically and economically important ungulate in ...
... Researchers at the Swedish medical university Karolinska Institutet have been ... receptor that binds sperm at the beginning of fertilization. The ... to better understanding of infertility and may enable entirely new ... has been grasped by the encounter of gametes egg ...
Cached Biology News:Modeling study identifies characteristics of high elk-use areas in western Oregon, Washington 2
(Date:9/15/2014)... Sept. 15, 2014  FlexTech Alliance today issued ... printed product demonstrators (demos) and a functional electronic ... with pre-proposals due on October 22, 2014 and ... proposals ultimately selected are provided by the US ... cost share by the proposing organization. ...
(Date:9/15/2014)... The very idea of fibers made of carbon nanotubes is ... literally. , The single-walled carbon nanotubes in new fibers created ... through a process designed by chemist Angel Mart and his ... reported its results this month in the journal ACS ... they,re drawn together into a fiber. , Left to their ...
(Date:9/15/2014)... , Sept. 15, 2014 Zymo Research ... transport solution for safe ambient temperature storage and ... testing. Importantly, the infectivity of agents in such samples ... the integrity of the viral nucleic acids for ... recent Ebola epidemic in West Africa ...
(Date:9/15/2014)... Texas , Sept. 15, 2014 The chemistry, ... in climate, says a new article published by the nonprofit ... , PhD, on climate change and its effects on the ... of an extensive study conducted by Dr. Ahmed in the ... China and has implications for the future of ...
Breaking Biology Technology:FlexTech Alliance Issues 2015 Request for Proposals in Flexible, Printed Electronics 2Rice rolls 'neat' nanotube fibers 2Rice rolls 'neat' nanotube fibers 3Safe storage and transport of Ebola, Mers-CoV, and other viruses: Groundbreaking viral inactivation solution capable of preserving nucleic acids 2Safe storage and transport of Ebola, Mers-CoV, and other viruses: Groundbreaking viral inactivation solution capable of preserving nucleic acids 3Tea Taste and Quality Affected by Climate Change 2Tea Taste and Quality Affected by Climate Change 3Tea Taste and Quality Affected by Climate Change 4
... is now licensed to supply ISBT 128-compliant label,design and printing software ... ... and laboratories, MILWAUKEE, Aug. 28 Niceware(R) International, LLC is,excited ... to provide ISBT 128-compliant blood bag labeling,software solutions that support ISBT ...
... August 28 XTL Biopharmaceuticals,Ltd. (NASDAQ: XTLB ... in the acquisition, development and commercialization of,therapeutics for ... and hepatitis C, today announced the receipt on ... indicating that, according to the,Company,s financial statements for ...
... its ADR Listing to the NASDAQ Capital Market, ... (NASDAQ: XTLB ; LSE: XTL; TASE: XTL), ... commercialization of,therapeutics for the treatment of unmet medical ... the receipt on August 23,2007, of a NASDAQ ...
Cached Biology Technology:Niceware International Announces Licensed Vendor Status with ICCBBA, Inc. to Provide ISBT 128-compliant Software 2XTL Receives Staff Letter From NASDAQ; XTL may Transfer its ADR Listing to the NASDAQ Capital Market 2XTL Receives Staff Letter From NASDAQ; XTL may Transfer its ADR Listing to the NASDAQ Capital Market 3XTL Receives Staff Letter From NASDAQ 2XTL Receives Staff Letter From NASDAQ 3
Mouse monoclonal [SPM302] to BCAR1, prediluted ( Abpromise for all tested applications). entrezGeneID: 9564 SwissProtID: P56945...
...
p21 Ras Immunogen: Recombinant C-H-ras p21(val-12). Storage: 4 C...
Rabbit polyclonal to Myosin VIIa (rating: *****) ( Abpromise for all tested applications). entrezGeneID: 4647 SwissProtID: Q13402...
Biology Products: