Sturgeon Posted June 25, 2015 Report Share Posted June 25, 2015 A new study of an otherworldly creature from half a billion years ago – a worm-like animal with legs, spikes and a head difficult to distinguish from its tail – has definitively identified its head for the first time, and revealed a previously unknown ring of teeth and a pair of simple eyes. The results, published today in the journal Nature, have helped scientists reconstruct what the common ancestor of everything from tiny roundworms to huge lobsters might have looked like. Researchers from the University of Cambridge, the Royal Ontario Museum and the University of Toronto have found that the creature, known as Hallucigenia due to its strange appearance, had a throat lined with needle-like teeth, a previously unidentified feature which could help connect the dots between it, modern velvet worms and arthropods – the group which contains modern insects, spiders and crustaceans. Arthropods, velvet worms (onychophorans) and water bears (tardigrades) all belong to the massive group of animals that moult, known as ecdysozoans. Though Hallucigenia is not the common ancestor of all ecdysozoans, it is a precursor to velvet worms. Finding this mouth arrangement in Hallucigenia helped scientists determine that velvet worms originally had the same configuration – but it was eventually lost through evolution. “The early evolutionary history of this huge group is pretty much uncharted,” said Dr Martin Smith, a postdoctoral researcher in Cambridge’s Department of Earth Sciences, and the paper’s lead author. “While we know that the animals in this group are united by the fact that they moult, we haven’t been able to find many physical characteristics that unite them.” “It turns out that the ancestors of moulting animals were much more anatomically advanced than we ever could have imagined: ring-like, plate-bearing worms with an armoured throat and a mouth surrounded by spines,” said Dr Jean-Bernard Caron, Curator of Invertebrate Palaeontology at the Royal Ontario Museum and Associate Professor in the Departments of Earth Sciences and Ecology & Evolutionary Biology at the University of Toronto. “We previously thought that neither velvet worms nor their ancestors had teeth. But Hallucigenia tells us that actually, velvet worm ancestors had them, and living forms just lost their teeth over time.” Here. LoooSeR 1 Quote Link to comment Share on other sites More sharing options...
Tied Posted June 26, 2015 Report Share Posted June 26, 2015 that is clearly Satan OP, it is 12 feet tall an trolls with 3 sock poppet accounts in the T110 thread Quote Link to comment Share on other sites More sharing options...
CrashbotUS Posted June 26, 2015 Report Share Posted June 26, 2015 Something out of a Lovecraft story.. Quote Link to comment Share on other sites More sharing options...
Toxn Posted June 26, 2015 Report Share Posted June 26, 2015 Something exceedingly small out of a Lovecraft story.. Quote Link to comment Share on other sites More sharing options...
CrashbotUS Posted June 26, 2015 Report Share Posted June 26, 2015 It only starts out small. Once it feeds on your madness, it grows..and grows....and grows.... Quote Link to comment Share on other sites More sharing options...
Toxn Posted June 26, 2015 Report Share Posted June 26, 2015 Not much madness in the Cambrian, apparently. Quote Link to comment Share on other sites More sharing options...
Priory_of_Sion Posted June 26, 2015 Report Share Posted June 26, 2015 Looks like you're basic lobopod, but without clear segmentation, going through a punk phase with the spikes. Below is Aysheaia, a lobopod also from the Burgess Shale. Xlucine 1 Quote Link to comment Share on other sites More sharing options...
Priory_of_Sion Posted June 29, 2015 Report Share Posted June 29, 2015 Here is another likely relative which does have spikes on its back from China, named Collinsium. Khand-e 1 Quote Link to comment Share on other sites More sharing options...
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