The chancefinding prompted a search for other samples that led them to private collections of fossils in the UK and the Netherlands. From those they gathered more evidence of male antiarchs with their claspers still attached.
Name suppression lifts on West Coast man facing 14 historic sex charges
The grooves in the organs are used to transfer sperm from male to female. Further examination of the antiarchs revealed the first evidence of discrete female sexual organs, in the form of small genital plates in exactly the right position to facilitate sex. The detailed studies led Long and his colleagues to solve another mystery that has puzzled specialists for more than a century.
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The discovery of such ancient copulation means that sex with internal fertilisation evolved early on in the history of vertebrates but was then lost, with fish reverting back to spawning in water, and then evolved again in a different way. Modern sharks and rays have claspers that they use to deposit sperm into females, but instead of being attached to their whole bodies as in antiarchs, the organs grow along the inner part of their pelvic fins.
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