Printer Friendly

Reining in a galloping Triceratops.

Reining in a galloping Triceratops

If the Triceratops model in your local museum stands with four straight legs planted firmly underneath its body, ask to have a word with the curator. A new analysis indicates these dinosaurs could not have walked with such a posture.

For two decades, paleontologists have hotly debated the limb position of ceratopsian dinosaurs, which include Triceratops. Early fossil collectors pictured these huge horned herbivores ambling with forelimbs sprawled lizard-like from the sdies of the body. Himdlimbs projected down underneath the body, like the legs of an elephant. But then Robert T. Bakker of the University of Colorado in Buoulder challenged that slowpoke image by showing ceratopsians in a stance with all legs descending directly under the body -- a posture that would have allowed the animals to gallop like rhinoceroses. Some museums have mounted ceratopsian dinosaurs in this position.

Now Rolf E. Johnson of the Milwaukee Public Museum and John H. Ostrom of Yale University think they have evidence that kicks the legs out from under the rhino-postured stance. WHile preparing to mount a recently discovered skeleton of Torosaurus -- a close relative of Triceratops -- the researchers tested the rhino-gaited and sprawling postures by constructing a flexible model using fiberglass casts of the shoulder and arm bones. This model shows that placing the Torosaurus forelimbs upright causes the elbow joint to point in an impossible postion. Johnson says that Torosaurs, Triceratops and probably all ceratopsian dinosaurs had sprawling lizard-like forelimbs after all, and therefore could not gallop. However, he adds, they could move quickly when necessary.

Other scientists contend the posture debate is not over.
COPYRIGHT 1990 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1990, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:new analysis of the limb position of horned dinosaurs
Author:Monastersky, Richard
Publication:Science News
Date:Oct 20, 1990
Previous Article:... but on the other hand.
Next Article:Dinosaur digestive aids.

Related Articles
Dinosaurs used their heads to beat the heat.
The accidental reign.
Getting the scoop from the poop of T. rex.
Strongest Biters.
A Makeover for an Old Friend.
How did triceratops grow its horns? (Paleontology).
Even flossing wouldn't have helped. (Paleontology).
Old frilly face: Triceratops' relative fills fossil-record gap.
Healed scars tag T. rex as predator.
Society sans frills.

Terms of use | Copyright © 2017 Farlex, Inc. | Feedback | For webmasters