Sphenacanthus is an extinct genus of shark which lived in the Early Carboniferous of Scotland. It may also look like a big fish, but it is really a shark. It lived about 359 million years ago. It was one of the first sharks to ever live. But it was not the first shark. Sphenacanthus also hunted fish that lived in the carboniferous. Because water creatures were the only living life forms on Earth. Sphenacathus was a freshwater shark.

 Sphenacanthus had a fish like body with 7 fins, 2 on the top and 5 on the bottom. No one knows how big they could get but they were rather large.

 Sphenacanthus' home was probably what now is known as Scotland. It shared its freshwater home with lots of other sharks, like 'Xenacantus'. This was also a freshwater shark. But it was only about a meter long.

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