A new type of 13 metre long necked sauropod dinosaur with a spiked tail (like
Stegosaurus) has been discovered.
The 170-million-year-old dinosaur, dubbed Spinophorosaurus nigerensis, had a tail studded with bony spikes that the animal likely swung at predators, study authors say in the September 16 edition of the journal PLoS One. Finding such a complete sauropod skeleton is extremely rare, and the new fossil may help scientists piece together the early evolution of the long-necked giants.
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edit: actually,
here is a much more in detail article.