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Scientists say they are stunned after discovering sea spiders have the ability to grow new reproductive organs and an anus.

Experts already knew that when the arthropods lose legs, they can regrow them.

...But in a development that will no doubt inspire the next generation of Spider-Man stories, a study has found the underwater creatures have regenerative powers which extend to their entire bottom halves.

"Nobody had expected this," said the lead researcher behind the breakthrough in understanding, Professor Gerhard Scholtz.

Other arthropods - invertebrates with no internal skeleton or backbone, but which do have an exoskeleton - such as centipedes and crabs, are also capable of regrowing limbs.

Some creatures can go further, with starfish able to regenerate their entire bodies on occasion - and lizards able to produce a new tail.