Stanleycaris is a distant relative of insects and spiders. The discovery clarifies the timeline of how their body plans evolved. Click the link to read more about it.
. One of them, the radiodont, had a predatory appendage, toothy circular mouth and a segmented body with swimming legs. It's an ancient relative of today’s arthropods, which include insects and spiders. In a new study, researchers report several hundred radiodont fossils with exquisitely preserved brains and nerves. The finding sheds light on how arthropods evolved their segmented body plans.
to find Cambrian fossils. United Nations Educational, Scientific and Cultural Organization even named it a world heritage site in 1981.isn’t the biggest radiodont. At 20 centimeters long, it’s a magnitude smaller than its one-meter-long relative, The head was differentiated from the rest of the body, which was divided into 17 repeating segments. This resembles the general body plan of today’s arthropods. But in today’s arthropods like insects, each segment has a neural center called a ganglion. Thenerve cord is completely non ganglionated. The researchers think that ganglia must have been a relatively recent evolutionary innovation.
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