Navigation Links
'Steak-knife' teeth reveal ecology of oldest land predators
Date:2/7/2014

The first top predators to walk on land were not afraid to bite off more than they could chew, a University of Toronto Mississauga study has found.

Graduate student and lead author Kirstin Brink along with Professor Robert Reisz from U of T Mississauga's Department of Biology suggest that Dimetrodon, a carnivore that walked on land between 298 million and 272 million years ago, was the first terrestrial vertebrate to develop serrated ziphodont teeth.

According to the study published in Nature Communications, ziphodont teeth, with their serrated edges, produced a more-efficient bite and would have allowed Dimetrodon to eat prey much larger than itself.

While most meat-eating dinosaurs possessed ziphodont teeth, fossil evidence suggests serrated teeth first evolved in Dimetrodon some 40 million years earlier than theropod dinosaurs.

"Technologies such as scanning electron microscope (SEM) and histology allowed us to examine these teeth in detail to reveal previously unknown patterns in the evolutionary history of Dimetrodon," Brink said.

The four-meter-long Dimetrodon was the top of the terrestrial food chain in the Early Permian Period and is considered to be the forerunner of mammals.

According to Brink and Reisz's research, Dimetrodon had a diversity of previously unknown tooth structures and were also the first terrestrial vertebrate to develop cusps teeth with raised points on the crown, which are dominant in mammals.

The study also suggests ziphodont teeth were confined to later species of Dimetrodon, indicating a gradual change in feeding habits.

"This research is an important step in reconstructing the structure of ancient complex communities," Reisz said.

"Teeth tell us a lot more about the ecology of animals than just looking at the skeleton."

"We already know from fossil evidence which animals existed at that time but now with this type of research we are starting to piece together how the members of these communities interacted."

Brink and Reisz studied the changes in Dimetrodon teeth across 25 million years of evolution.

The analysis indicated the changes in tooth structure occurred in the absence of any significant evolution in skull morphology. This, Brink and Reisz suggest, indicates a change in feeding style and trophic interactions.

"The steak knife configuration of these teeth and the architecture of the skull suggest Dimetrodon was able to grab and rip and dismember large prey," Reisz said.

"Teeth fossils have attracted a lot of attention in dinosaurs but much less is known about the animals that lived during this first chapter in terrestrial evolution."


'/>"/>

Contact: Gareth Trickey
gareth.trickey@utoronto.ca
905-828-3983
University of Toronto
Source:Eurekalert  

Related biology news :

1. Incisive research links teeth with diet
2. Sports and energy drinks responsible for irreversible damage to teeth
3. Rubbing boulders, fossil mammal teeth, barrier islands, and a change in volcanic behavior
4. Ancient fossils reveal how the mollusc got its teeth
5. Shark rules need teeth, groups tell IUCN
6. First fossil bird with teeth specialized for tough diet
7. Using snail teeth to improve solar cells and batteries
8. Ovarian tumor, with teeth and a bone fragment inside, found in a Roman-age skeleton
9. Ancient teeth bacteria record disease evolution
10. How the whale got its teeth
11. Soda and illegal drugs cause similar damage to teeth
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
'Steak-knife' teeth reveal ecology of oldest land predators
(Date:1/13/2016)... ALBANY, New York , January 13, 2016 /PRNewswire/ ... Transparency Market Research has published a new market report ... Share, Growth, Trends, and Forecast, 2015 - 2023. According to ... mn in 2014 and is anticipated to reach US$1,625.8 ... from 2015 to 2023. In terms of volume, the ...
(Date:1/11/2016)... , Jan. 11, 2016 Synaptics Incorporated (NASDAQ: ... solutions, today announced that its ClearPad ® TouchView ... products won two separate categories in the 8 th ... and Best Technology Breakthrough. The Synaptics ® TDDI ... simplified supply chain, thinner devices, brighter displays and borderless ...
(Date:1/8/2016)... MANCHESTER, United Kingdom , Jan. 8, 2016 /PRNewswire/ ... sensor-based diagnostic products, today announced the closing of a $9 ... investors.  Proceeds from the financing will be used to accelerate ... device for detecting early-stage pressure ulcers. ... after receiving CE Mark approval. The device,s introduction has been ...
Breaking Biology News(10 mins):
(Date:2/5/2016)... , Feb. 5, 2016 Australian-US drug discovery and ... today the appointment of a new Chairman, Mr John ... , effective immediately. James Garner , has ... Director and former Acting CEO, Mr Iain Ross , ... Director. --> James Garner , has also been ...
(Date:2/4/2016)... , ... February 04, 2016 , ... ... GC-MS and triple quad LC-MS, host live demos and poster sessions, and present ... and exhibition. The conference takes place March 6 to 10 at the Georgia ...
(Date:2/4/2016)... VANCOUVER, British Columbia and MENLO PARK, ... Inc. (OTCQX: DMPI) ("DelMar" and the "Company"), a biopharmaceutical ... therapies, today announced that it will present at the ... on Monday, February 8, 2016 at 10:00 a.m. EST in ... Jeffrey Bacha , DelMar,s president and CEO, will provide an ...
(Date:2/4/2016)... 4, 2016 Sinovac Biotech Ltd. ("Sinovac" or ... of biopharmaceutical products in China , ... of directors received on February 4, 2016 a preliminary ... consortium comprised of PKU V-Ming ( Shanghai ... CICC Qianhai Development ( Shenzhen ) Fund ...
Breaking Biology Technology: