50-legged creature was top seafloor predator

An ancient cockroach-like creature nearly a foot long once skittered along the seafloor in what is now Canada, a new fossil find reveals.

The fossil, a series of 500-million-year-old tracks, captured the movement of a large seafloor-dwelling creature with at least 25 pairs of legs. The animal was likely an arthropod called Tegopelte, a rare giant very rarely found fossilized. Arthropods are invertebrates with exoskeletons, a group that includes today's crustaceans and insects.

Reporting the discovery Tuesday in the journal Proceedings of the Royal Society B, researchers led by Nicholas Minter of the University of Saskatchewan in Canada suggest that Tegopelte was a fearsome predator or perhaps a quick-moving scavenger, capable of "rapidly skimming across the seafloor" with only a few of its many legs touching the ground at a time.

1. More science news from MSNBC Tech & Science

   1. Electric vehicle?gets 350 mpg, wins race

      Future of Tech: An electric vehicle designed by a former Formula 1 racecar designer sipped its way to first place in showcase race for cars of the future by getting the equivalent of 350 miles per gallon on the 57.13 mile course.

   2. World's tiniest electric vehicle rolls out
   3. Scientist creates thermal 'invisibility cloak'
   4. X-rays scans reveal baby mammoth mysteries

The new fossils, five trackways made by the ancient arthropod, were uncovered in two locations in Yoho National Park in British Columbia in a geologic formation called the Burgess Shale. The longest track extended more than 9 feet, and the footprints were set more than 4 inches apart, suggesting a good-sized critter with a wide stance.

The researchers compared the tracks with the anatomy of known arthropods from the time period and concluded that the most likely footprint-maker was Tegopelte. This creature, which looked a bit like an enormous beetle and which was possibly related to trilobites, could grow to at least 11 inches long and 5.5 inches wide, with 33 sets of legs. That made it the best fit for the tracks, which represented at least 25 pairs of pattering feet.?

1. Most popular

   1. Penn St. trustees fire Joe Paterno, school president
   2. Ninth foot washes up in Canada ? with a twist
   3. Dems make secret offer to cut deficit by $2 trillion
   4. Embarrassed Perry forgets key debate point
   5. Winners and losers of GOP debate

Tegopelte's flexible, bug-like exoskeleton likely allowed it to make the sharp turns evidenced in some of the tracks, the researchers wrote. The tracks also reveal sections where the animal "skimmed" along the seafloor with only a few legs bearing weight. The tracks suggest a fast-moving creature, the researchers wrote. It could have skittered to avoid predators, but the animal was twice the size of any other Burgess Shale arthropod, the researchers wrote. That size advantage suggests that the animal could have been a top predator itself.

You can follow LiveScience senior writer Stephanie Pappas on Twitter@sipappas. Follow LiveScience for the latest in science news and discoveries on Twitter @livescience and on Facebook.

? 2011 LiveScience.com. All rights reserved.

Source: http://www.msnbc.msn.com/id/45215621/ns/technology_and_science-science/

homeland homeland andy rooney 60 minutes andre johnson andre johnson arrested development arrested development