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Spiny worm
More than 500 million twelvemonth ago , a worm swam in the sea ’s mysterious water , hunting for flyspeck target that it could capture with its 50 pointy spines . The worm was small , just 4 inch long ( 10 centimeter ) , but it would have been a formidable marauder for modest marine animal that lived along the bottom of the sea , such as larvae and humble crustacean that front like runt . The spiny worm , dubbedCapinatator praetermissus , was likely a forerunner of modern arrowworms , midget marine worms that inhabit and hound in the above weewee tower with other loose - float brute . [ Read the Full Story on the Spiny Worm ]
Ancient worm
This illustration depicts a large , primitive chaetognath , a well - preserve specimen of a fresh identified species calledCapinatator praetermissus . The metal money — which has smaller , innovative relatives that chow on plankton — was key from 508 - million - yr - old Burgess Shale fogy .
Multiple spines
This maritime worm had almost twice as many pairs of spines that it used to capture prey — up to 25 pairs — as its advanced - sidereal day counterparts . The pictured specimen was uncovered in Burgess Shale at Walcott Quarry in British Columbia ’s Yoho National Park .
Wormy details
A diagram of theC. praetermissusshows the division of the marine dirt ball from multiple angle .
Best look
This specimen , from the Collins Quarry at Mount Stephen in British Columbia , displays the most completeC. praetermissuson record . The fogey is 3 inches ( 7.5 cm ) long and has spines on the left and the posterior to the right . In accession , part of its gut is clearly visible in the heart of the specimen . The nautical worm is believed to be a bottom - confluent , whereas its modern cousins survive in the water column with other free - floating creatures .
Eating appendages
The Royal Ontario Museum houses 48 of the 49 dirt ball specimens , many of which still have their eating apparatuses attach to their principal . Others have fossilized evidence of the quietus of their bodies . The other specimen , at the Smithsonian National Museum of Natural History in Washington , D.C. , has a undivided set of savvy appendage .
Teamwork
At a 1983 fieldwork hostile expedition on Mount Stephen in the Canadian Rockies , a Royal Ontario Museum team , conduct by Desmond Collins , expose several Burgess Shale - type fossils that were identified afterwards asC. praetermissus .
Rocky history
During the 1983 dig , member of the Royal Ontario Museum squad collected fossils ofC. praetermissus , which is now identify not only as a new species but also a fresh genus ( Capinatator ) of ancient marine brute .
Famous location
The Burgess Shale fossil sites on Mount Stephen and in the nearby Walcott Quarry in Canada ’s Yoho National Park are acclaimed for the well - preserved leatherneck dodo from the so - called explosion of life story that prospered during the Cambrian period.[Read the full story on the spiny worm ]
