Palaeospondylus ganniwas a small, eel-like creature that lived during the mid-Devonian period, about 390 million years ago, and is among thousands of similarly preserved fossils from the Achanaras Quarry in Caithness, Scotland. is represented by. Radically different interpretations of its structure had assigned this species to almost all major jawless and jawed vertebrate groups. Paleontologists are currently identifying new and old species. spondylosis From the early Devonian period of Australia.
Palaeospondylus australisbrain cases and histological sections. Image credit: Barrow others., doi: 10.1093/nsr/nwae444.
First described in 1890, spondylosis It is a mysterious fish-like animal with a series of strange morphological features in the fossil record, including a lack of teeth and osteodermal bones.
Until now it was only known as Palaeospondylus ganni From the Middle Devonian Orcadian Basin in Scotland.
Initially interpreted as jawless vertebrates, they were soon classified into their own order and family.
Whereas the Scottish specimen was extremely compressed with all skeletal elements welded together, the new discovery spondylosisis located in a 400-million-year-old limestone in the Georgina Basin of western Queensland, central Australia, and is in a very different state of preservation as a 3D unfractured element.
“This is an amazing addition to Queensland's fossil record and is at the other end of the size scale of prehistoric giants like dinosaurs.” loetosaurus and Australotitan couperensis'' said Carol Barrow, a paleontologist at the Queensland Museum.
“What? Palaeospondylus australis Even more interesting is its relationship with similar species in northern Scotland. Palaeospondylus ganni”
The new fossil's honeycomb-like structure and complex internal features suggest the fish's early evolutionary importance.
The exact relationship is Palaeospondylus australis Although much remains unclear, as its features indicate that it retains many larval features, it is likely to be a distant relative of sharks.
This groundbreaking discovery not only enriches our understanding of ancient Australian ecosystems, but also highlights the global connectivity of early vertebrates across continents.
research Palaeospondylus australis It promises to uncover more mysteries about the evolution of jawed vertebrates.
“Discovery of a mysterious animal” spondylosis The early Devonian discovery in Australia indicates that this form is likely to have been distributed globally, given that Scotland and eastern Australia were then and now on opposite sides of the globe. “, the paleontologists said.
“New evidence regarding neurocranial features… spondylosis Adds important but contradictory information about that affinity. ”
“Until new and better evidence becomes available, spondylosis It is considered a pedunculate gnathostome, possibly a sister group to the cartilaginous fishes, and shows a mosaic of characters exhibited by both the osteoostia and some placoderms, as well as by the cartilaginous and teleost fishes. ”
of result appear in the diary National Science Review.
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Carol J. Barrow others. 3D brain box of early jawed vertebrates spondylosis From Australia. National Science Reviewpublished online on December 3, 2024. Doi: 10.1093/nsr/nwae444
Source: www.sci.news
