Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. 24/7 Space News .




EARLY EARTH
Plant-eating dinosaurs replaced teeth often, carried spares
by Staff Writers
London, UK (SPX) Jul 19, 2013


This is a CT-generated movie of the premaxilla of Diplodocus (YPM 4677), with bone rendered transparent and teeth opaque. Credit: D'Emic MD, Whitlock JA, Smith KM, Fisher DC, Wilson JA (2013) Evolution of High Tooth Replacement Rates in Sauropod Dinosaurs. PLoS ONE 8(7): e69235. doi:10.1371/journal.pone.0069235.

Some of the largest herbivorous dinosaurs replaced their teeth at a rate of approximately one tooth every 1-2 months to compensate for tooth wear from crunching up plants, according to research published July 17 in the open access journal PLOS ONE by Michael D'Emic from Stony Brook University and colleagues from other institutions.

A little like counting tree rings, researchers can estimate rates of tooth formation and replacement in extinct animals by counting lines of deposition of tooth dentin, a layer below enamel that grows throughout an animal's life. In this study, authors estimated tooth replacement rates in Diplodocus and Camarasaurus, two distantly related, different-looking sauropod dinosaurs of similar giant size.

Camarasaurus had up to three "baby teeth" lined up in each tooth socket, and replaced about one tooth every 62 days. Each Diplodocus tooth socket held up to five replacement teeth and one functional tooth, and each tooth was replaced once in 35 days.

As D'Emic explains, "A nearly 100-foot-long sauropod would have had a fresh tooth in each position about every one to two months, sometimes less.

Effectively, sauropods took a 'quantity over quality' approach to making teeth, opposite the approach taken by large animals -mammals - today."

These sauropod dinosaurs were the largest terrestrial herbivores known, and would have required huge food supplies. Eating large amounts of plant foods likely caused extensive tooth wear, requiring this constant growth and replacement. Differences in the rates at which these species replaced their teeth could reflect differences in their feeding strategies or food choices.

D'Emic MD, Whitlock JA, Smith KM, Fisher DC, Wilson JA (2013) Evolution of High Tooth Replacement Rates in Sauropod Dinosaurs. PLoS ONE 8(7):e69235. doi:10.1371/journal.pone.0069235

.


Related Links
Public Library of Science
Explore The Early Earth at TerraDaily.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





EARLY EARTH
Earth's Gold Came from Colliding Dead Stars
Cambridge, MA (SPX) Jul 19, 2013
We value gold for many reasons: its beauty, its usefulness as jewelry, and its rarity. Gold is rare on Earth in part because it's also rare in the universe. Unlike elements like carbon or iron, it cannot be created within a star. Instead, it must be born in a more cataclysmic event - like one that occurred last month known as a short gamma-ray burst (GRB). Observations of this GRB provide ... read more


EARLY EARTH
Soviet Moon rover moved farther than thought

Scientist says Earth may once have been orbited by two moons

Dust hazard for Moon missions: scientists

NASA Seeks Information on Commercial Robotic Lunar Lander Capabilities

EARLY EARTH
New Mars mission: in the Vikings' steps

Overhead View of Mars Rover 10 Years After Launch

Third Drive of Curiosity's Long Trek Covers 135 Feet

DNA-sequencing chip could be sent to Mars to search for signs of life

EARLY EARTH
The Zero Gravity Coffee Cup

Outside View: Future science fiction

New Flight Projects Building Boasts First NASA Goddard 'Green' Roof

Technology Could Curtail Astronaut Conflict

EARLY EARTH
Medical quarantine over for Shenzhou-10 astronauts

China's astronauts ready for longer missions

Chinese probe reaches record height in space travel

China's space tracking ship Yuanwang-5 berths at Jakarta for replenishment

EARLY EARTH
Space Station ARISS Software Upgraded by Student For Students

Astronaut's helmet leak forces abrupt end to spacewalk

NASA puzzled as astronaut's helmet leak halts spacewalk

Luca, the orbital repair man

EARLY EARTH
Alphasat stacks up

ESA Signs Off On Baseline Configuration Of Ariane 6

Alphasat and INSAT 3D fueled for Ariane 5 heavy lift dual launch

Special group to be set up for inspecting production of Proton-M carrier rockets

EARLY EARTH
UM Researchers Land NASA Grant to Search Space for Exoplanets

Disks Don't Need Planets to Make Patterns

Hubble Finds a Cobalt Blue Planet

Gaps in dust around stars may not indicate planets as many believe

EARLY EARTH
Homemade 3D guns in US stir more buzz than bang

ASC Signal Doubles Mission Capabilities Across Its Satellite Antenna Line

Raytheon touts company developments

Surface porosity and wettability are key factors in boiling heat transfer




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement