Oldest known ancestor of octopuses had 10 limbs: Study

Palaeontologists on Tuesday said the oldest known ancestor of octopuses which lived nearly 330 million years ago had 10 limbs with two of them twice as long as the other eight. Named Syllipsimopodi bideni after US President Joe Biden, the animal was 12 centimetres long and had two parallel rows of suckers up and down each arm.