Palaeontology / en Prehistoric marine worm caught prey with spines deployed from head: 老司机直播 and Yale University research /news/prehistoric-marine-worm-caught-prey-spines-deployed-head-u-t-and-yale-university-research <span class="field field--name-title field--type-string field--label-hidden">Prehistoric marine worm caught prey with spines deployed from head: 老司机直播 and Yale University research</span> <div class="field field--name-field-featured-picture field--type-image field--label-hidden field__item"> <img loading="eager" srcset="/sites/default/files/styles/news_banner_370/public/2017-08-03-arrow-worm.jpg?h=afdc3185&amp;itok=v6CZf30q 370w, /sites/default/files/styles/news_banner_740/public/2017-08-03-arrow-worm.jpg?h=afdc3185&amp;itok=gdVAprHY 740w, /sites/default/files/styles/news_banner_1110/public/2017-08-03-arrow-worm.jpg?h=afdc3185&amp;itok=FmrfidXy 1110w" sizes="(min-width:1200px) 1110px, (max-width: 1199px) 80vw, (max-width: 767px) 90vw, (max-width: 575px) 95vw" width="740" height="494" src="/sites/default/files/styles/news_banner_370/public/2017-08-03-arrow-worm.jpg?h=afdc3185&amp;itok=v6CZf30q" alt> </div> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span>ullahnor</span></span> <span class="field field--name-created field--type-created field--label-hidden"><time datetime="2017-08-03T12:18:25-04:00" title="Thursday, August 3, 2017 - 12:18" class="datetime">Thu, 08/03/2017 - 12:18</time> </span> <div class="clearfix text-formatted field field--name-field-cutline-long field--type-text-long field--label-above"> <div class="field__label">Cutline</div> <div class="field__item">The 鈥淐apinatator praetermissus,鈥 a primitive arrow worm, was identified from 508-million-year-old Burgess Shale fossils. Today these predatory marine worms are smaller and found in plankton (illustration by Marianne Collins/ROM) </div> </div> <div class="field field--name-field-topic field--type-entity-reference field--label-above"> <div class="field__label">Topic</div> <div class="field__item"><a href="/news/topics/global-lens" hreflang="en">Global Lens</a></div> </div> <div class="field field--name-field-story-tags field--type-entity-reference field--label-hidden field__items"> <div class="field__item"><a href="/news/tags/palaeontology" hreflang="en">Palaeontology</a></div> <div class="field__item"><a href="/news/tags/ecology-and-evolutionary-biology" hreflang="en">Ecology and Evolutionary Biology</a></div> <div class="field__item"><a href="/news/tags/fossils" hreflang="en">Fossils</a></div> <div class="field__item"><a href="/news/tags/faculty-arts-science" hreflang="en">Faculty of Arts &amp; Science</a></div> </div> <div class="field field--name-field-subheadline field--type-string-long field--label-above"> <div class="field__label">Subheadline</div> <div class="field__item">鈥淐apinatator鈥 is a new species of arrow worm from the Cambrian period</div> </div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>A team of scientists has&nbsp;identified a small marine predator that once patrolled the ocean floor and grabbed its prey with 50 spines deployed from its head.</p> <p>Named <em>Capinatator praetermissus</em>, this ancient creature is roughly 10 centimetres long and represents a new species within the group of animals known as chaetognaths 鈥 small, swimming marine carnivores also known as arrow worms.&nbsp;</p> <p><iframe allowfullscreen frameborder="0" height="500" src="https://www.youtube.com/embed/xkRNYfzlqVo" width="750"></iframe></p> <p>At more than 500 million-years-old, <em>C</em><em>apinatator</em> is thought to be a forerunner of the smaller chaetognaths that are abundant in today鈥檚 oceans, where they make up a large portion of the world鈥檚 plankton and the ocean food chain. It&nbsp;is one of the largest chaetognaths known, according to a paper&nbsp;published today in&nbsp;<a href="http://www.cell.com/current-biology/fulltext/S0960-9822(17)30860-6"><em>Current Biology</em></a>.&nbsp;</p> <p>鈥淭his new species would have been an efficient predator and a terrifying sight to many of the smallest marine creatures that lived during that time,鈥 said <strong>Jean-Bernard Caron</strong>, an associate professor in the departments of ecology &amp; evolutionary biology and earth sciences at U&nbsp;of T's Faculty of Arts &amp; Science.</p> <p>He is also a&nbsp;senior curator of invertebrate palaeontology at the Royal Ontario Museum (ROM). Caron made the identification with Derek Briggs of Yale University, based on 50 specimens from the fossil-rich Burgess Shale in British Columbia.</p> <p>鈥淭his is the most significant fossil discovery about the chaetognath group of animals to date,鈥 said Briggs, a professor of geology and geophysics and a curator at the Yale Peabody Museum of Natural History.</p> <p><img alt class="media-image attr__typeof__foaf:Image img__fid__5414 img__view_mode__media_original attr__format__media_original" src="/sites/default/files/2017-08-03-Capinatator.jpg" style="width: 750px; height: 505px; margin: 10px;" typeof="foaf:Image"><br> <em>Of the specimens studied, many preserve the feeding apparatus attached to the head, with some showing evidence of the rest of the body. Forty-eight specimens are held by the ROM. This one is from the Collins Quarry at&nbsp;Mount Stephen in the Yoho National Park, B.C. (photo by&nbsp;Jean-Bernard Caron)</em></p> <p>According to the researchers, <em>C</em><em>apinatator</em>鈥檚 head configuration is unique. With about 25 spines in each side of its head, the species has nearly double the maximum number of spines found in today鈥檚 chaetognaths. This enabled <em>Capinatator</em> to capture prey by closing the two halves of its grasping spines toward each other as it swam.</p> <p>Briggs and Caron also determined that while it is fairly common to find evidence of chaetognath spines, fossilized chaetognath bodies are extraordinarily rare. Many of the <em>Capinatator</em> specimens in this study included evidence of soft tissues.</p> <p>鈥淭hese Burgess Shale fossil specimens preserve evidence of features such as the gut and muscles, which normally decay away, as well as the more decay-resistant grasping spines,鈥 said Briggs. 鈥淭hey show that chaetognath predators evolved during the explosion of marine diversity during the Cambrian period&nbsp;and were an important component of some of the earliest marine ecosystems.鈥</p> <p><iframe allowfullscreen frameborder="0" height="500" src="https://www.youtube.com/embed/exi1s-9K4vY" width="750"></iframe></p> <p>The species name <em>praetermissus</em>&nbsp;means 鈥渙verlooked.鈥&nbsp;The name <em>Capinatator </em>is derived from <em>capio</em>,&nbsp;which means 鈥渢o grasp鈥 and <em>natator</em>,&nbsp;which means 鈥渟wimmer.鈥</p> <p>The material for this study, currently held in the ROM鈥檚 collections, was collected under research and collecting permits provided by Parks Canada. The Burgess Shale fossil sites are located within Yoho and Kootenay National Parks. Parks Canada protects the sites and works with leading scientific researchers to expand knowledge and understanding of this key period of earth history. The Burgess Shale was designated a UNESCO World Heritage Site in 1980.</p> <p>Research funding was provided by the NASA Astrobiology Institute, the Natural Sciences and Engineering Research Council, the ROM Reproductions Fund&nbsp;and the Louise Hawley Stone Charitable Trust Publications Fund.</p> <h3><a href="/news/find-a-story?query=jean-bernard%20caron&amp;field_topic_tid=All&amp;field_tag_tid_1&amp;date_filter%5Bmin%5D%5Bdate%5D=&amp;date_filter%5Bmax%5D%5Bdate%5D=">Read other species identified from the Burgess Shale</a></h3> </div> <div class="field field--name-field-news-home-page-banner field--type-boolean field--label-above"> <div class="field__label">News home page banner</div> <div class="field__item">Off</div> </div> Thu, 03 Aug 2017 16:18:25 +0000 ullahnor 111504 at