Fossilized Pregnant Fish One Of First Animals To Have Sex

Fossilized pregnant fish was one of the first animals to have sex. A pregnant fossil fish at the Natural History Museum in London has shed light on the possible origin of sex, according to a new study. Dating from the Upper Devonian period 365 million years ago, the adult placoderm fish Incisoscutum ritchiei is one of the earliest examples of a pregnant vertebrate and contains a five-centimetre-long embryo.

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