Jurassic 10-Armed 'Squid' Were Speedy Swimmers

The fossils represent Acanthoteuthis, a genus of squid relatives that lived during the Jurassic period and measured between 9.8 and 15.7 inches (25 and 40 centimeters) long. Acanthoteuthis is a cephalopod, part of the ocean-dwelling group that includes modern octopus, squid and cuttlefish, with an evolutionary history spanning 500 million years. Acanthoteuthis belongs to a group of cephalopods called belemnites, which are particularly abundant in the fossil record — or at least a small par