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href="https://www.sci.news/author/anderson">Natali Anderson</a> </div> </div> <div class="single-pagi"> <div class="prev-nav"> <a href="https://www.sci.news/paleontology/new-zealand-platypterygiid-ichthyosaur-13493.html">« Previous </a></div> | <div class="next-nav"> <a href="https://www.sci.news/biology/lepidosaur-jaw-evolution-13501.html">Next »</a></div> <div class="cb"></div> </div> <div class="cb"></div> </div> </header> <section> <div id="single-heading-content">  <div class="single-right"> <article id="post-102197" class="post-102197 post type-post status-publish format-standard has-post-thumbnail hentry category-paleontology tag-australia tag-brain tag-braincase tag-chondrichthyes tag-devonian tag-fish tag-fossil tag-georgina-basin tag-gnathostome tag-jawed-vertebrate tag-palaeospondylus tag-palaeospondylus-australis tag-palaeospondylus-gunni tag-queensland tag-shark tag-vertebrate"> <div class="entry-content"> <p><strong><em>Palaeospondylus gunni</em>, a small creature with an eel-like body that lived during the Middle Devonian epoch around 390 million years ago, is represented by thousands of similarly preserved fossils from Achannaras quarry in Caithness, Scotland. With radically different interpretations of its structure, the species had been assigned to almost all major jawless and jawed vertebrate groups. Paleontologists have now described a new and older species of <em>Palaeospondylus</em> from the Early Devonian of Australia.</strong></p> <div id="attachment_102198" style="width: 590px" class="wp-caption aligncenter"><a href="https://cdn.sci.news/images/enlarge12/image_13500e-Palaeospondylus-australis.jpg"><img aria-describedby="caption-attachment-102198" class="wp-image-102198 size-full" src="https://cdn.sci.news/images/2024/12/image_13500-Palaeospondylus-australis.jpg" alt="Palaeospondylus australis, braincase and histological section. Image credit: Burrow et al., doi: 10.1093/nsr/nwae444." width="580" height="328" srcset="https://cdn.sci.news/images/2024/12/image_13500-Palaeospondylus-australis.jpg 580w, https://cdn.sci.news/images/2024/12/image_13500-Palaeospondylus-australis-300x170.jpg 300w, https://cdn.sci.news/images/2024/12/image_13500-Palaeospondylus-australis-195x110.jpg 195w" sizes="(max-width: 580px) 100vw, 580px" /></a><p id="caption-attachment-102198" class="wp-caption-text"><em>Palaeospondylus australis</em>, braincase and histological section. Image credit: Burrow <em>et al</em>., doi: 10.1093/nsr/nwae444.</p></div> <p>First described in 1890, <a href="https://en.wikipedia.org/wiki/Palaeospondylus" target="_blank" rel="noopener"><em>Palaeospondylus</em></a> is a mysterious fish-like animal with a strange set of morphological features, including a lack of teeth and dermal bones in the fossil record.</p> <p>Until now it has been only known as <a href="https://www.sci.news/paleontology/palaeospondylus-gunni-10845.html" target="_blank" rel="noopener"><em>Palaeospondylus gunni</em></a> from the Middle Devonian Orcadian Basin of Scotland.</p> <p>It was initially interpreted as a jawless vertebrate, and shortly after placed in its own order and family.</p> <p>Whereas the Scottish specimens are extremely compressed, with all skeletal elements welded together, the new discovery of <em>Palaeospondylus</em>, in a 400-million-year-old limestone of Georgina Basin, western Queensland, central Australia, has a completely different preservation as 3D uncrushed elements.</p> <p>“This is a remarkable addition to Queensland’s fossil record, at the other end of the size scale to prehistoric giants like dinosaurs <em>Rhoetosaurus</em> and <em>Australotitan cooperensis</em>,” said Queensland Museum paleontologist Carole Burrow and colleagues.</p> <p>“What makes <em>Palaeospondylus australis</em> even more intriguing is its connection to a similar species from northern Scotland, <em>Palaeospondylus gunni</em>.”</p> <p>The new fossils’ honeycomb-like structure and intricate internal features hint at the fish’s early evolutionary significance.</p> <p>While the exact relationships of <em>Palaeospondylus australis</em> remain unclear, with features indicating it retained many larval characters, it is likely a distant relative of sharks.</p> <p>This breakthrough not only enriches our understanding of ancient Australian ecosystems but also highlights the global connections of early vertebrate life across continents.</p> <p>The study of <em>Palaeospondylus australis</em> promises to unravel more mysteries about the evolution of jawed vertebrates.</p> <p>“Discovery of the mysterious animal <em>Palaeospondylus</em> in the Early Devonian of Australia indicates a likely worldwide distribution of the form, given that Scotland and eastern Australia were on opposite sides of the globe then as now,” the paleontologists said.</p> <p>“Our new evidence of the neurocranial features of <em>Palaeospondylus</em> adds critical, but conflicting, information regarding its affinities.”</p> <p>“Until new and superior evidence becomes available, <em>Palaeospondylus</em> can be regarded as a paedomorphic stem gnathostome, perhaps sister group to the Chondrichthyes, showing a mosaic of features exhibited by osteostracans and some placoderms, as well as both chondrichthyans and osteichthyans.”</p> <p>The <a href="https://academic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwae444/7915995" target="_blank" rel="noopener">results</a> appear in the journal <em>National Science Review</em>.</p> <p><span style="color: #808080;">_____</span></p> <p><span style="color: #808080;">Carole J. Burrow <em>et al</em>. A 3D braincase of the early jawed vertebrate <em>Palaeospondylus</em> from Australia. <em>National Science Review</em>, published online December 3, 2024; doi: 10.1093/nsr/nwae444</span></p> </div> </article> </div> <div class="single-left"> <div class="postedby"> Published in </div> <div class="single-category"><ul class="post-categories"> <li><a href="https://www.sci.news/news/paleontology" >Paleontology</a></li></ul></div> <div class="postedby2"> <div class="postedby"> Tagged as </div></div> <div class="single-tags"> <a href="https://www.sci.news/tag/australia" rel="tag">Australia</a><a href="https://www.sci.news/tag/brain" rel="tag">Brain</a><a href="https://www.sci.news/tag/braincase" rel="tag">Braincase</a><a href="https://www.sci.news/tag/chondrichthyes" rel="tag">Chondrichthyes</a><a href="https://www.sci.news/tag/devonian" rel="tag">Devonian</a><a href="https://www.sci.news/tag/fish" rel="tag">Fish</a><a href="https://www.sci.news/tag/fossil" rel="tag">Fossil</a><a href="https://www.sci.news/tag/georgina-basin" rel="tag">Georgina Basin</a><a href="https://www.sci.news/tag/gnathostome" rel="tag">Gnathostome</a><a href="https://www.sci.news/tag/jawed-vertebrate" rel="tag">Jawed vertebrate</a><a href="https://www.sci.news/tag/palaeospondylus" rel="tag">Palaeospondylus</a><a href="https://www.sci.news/tag/palaeospondylus-australis" rel="tag">Palaeospondylus australis</a><a href="https://www.sci.news/tag/palaeospondylus-gunni" rel="tag">Palaeospondylus gunni</a><a href="https://www.sci.news/tag/queensland" rel="tag">Queensland</a><a href="https://www.sci.news/tag/shark" rel="tag">Shark</a><a href="https://www.sci.news/tag/vertebrate" rel="tag">Vertebrate</a></div> <div class="postedby3"></div> <div class="postedby3"></div> <div class="single-related"> <div class="postedby">You Might Like </div> <div class="related"> <div class="relatedpost"> <a href="https://www.sci.news/paleontology/tameryraptor-markgrafi-13589.html"><img width="104" height="75" src="https://cdn.sci.news/images/2025/01/image_13589f-Tameryraptor-markgrafi-104x75.jpg" class="attachment-secondpostimg size-secondpostimg wp-post-image" alt="Life reconstruction of Tameryraptor markgrafi. 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