-- Scientists have confirmed the oldest penis-like structure in an ancient fish specimen. The discovery of the 400 million-year-old reproductive organ is one of the earliest examples of internal fertilization in vertebrate animals. Understanding the anatomy of these ancient fish could reveal further details in the evolution of vertebrates -- including humans. The research is published in today's advanced online ahead of print edition of Nature. Earlier this year the team, led by Australian palaeontologist Dr John Long, predicted some ancient fish from the Devonian era, had an attachment to their pelvic bone, which were used by males to fertilize...