Fossilised pregnant fish was one of the first animals to have sex

(PhysOrg.com) -- A pregnant fossil fish at the Natural History Museum in London has shed light on the possible origin of sex, according to a study published in Nature today by an international team including Museum scientists. The fossil is an adult placoderm, an extinct group of armoured fish, and it contains a 5cm-long embryo. It is dated to the Upper Devonian period 350 million years ago and was found in the Gogo formation of western Australia.

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