Prehistoric fish pioneered sex

By Ben Hirschler. Internal fertilization was widespread among prehistoric fish living on ancient tropical coral reefs in the Devonian period, research published in the journal Nature on Wednesday showed. The discovery sheds new light on the reproductive history of all jawed vertebrates, including humans. Johanson and colleagues in Australia, where the fossils were unearthed, deduced that copulation was common among armored placoderms, extinct shark-like species, after finding embryos inside Materpiscis, Austroptyctodus and Incisoscutum placoderms. Finding fossil evidence of reproduction is rare and experts initially missed the signs in the case of one specimen, where a tiny embryo was at first thought to be a last meal. It was thought that such ancient fish would show a more primitive type of reproduction, with sperm and eggs combining externally in the water, as still happens with many modern fish.
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02.08.2020
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Prehistoric fish pioneered sex

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Fish Invented Sex Million Years Ago | NOVA | PBS

Researchers have traced the act of copulation back to its most primitive form. The antiarch fish—an ancient lake-dwelling placoderm—is now the oldest species known to have sex, according to a new study published in Nature. The bony fishes that follow placoderms in the evolutionary tree show no evidence of internal fertilization—meaning that at some point, antiarchs gave up on their new method and went back to spawning in water. The finding, which rewrites the entire history of sex, was an accident—and a moment of scientific inspiration. Like so many in science, the latest discovery came about by chance.
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Scientists: Ancient Scottish Fish Invented Sex 385 Million Years Ago

Internal fertilization was widespread among prehistoric fish living on ancient tropical coral reefs in the Devonian period, research published in the journal Nature on Wednesday. Get the top news stories delivered directly to your inbox! Articles Photos Advanced Search.
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We use cookies and other tracking technologies to improve your browsing experience on our site, show personalized content and targeted ads, analyze site traffic, and understand where our audiences come from. To learn more or opt-out, read our Cookie Policy. The fish that we know today tend to spawn in order to reproduce — releasing zillions of eggs and sperm into the water and hoping they'll meet. Fish were having sex million years ago — and then gave up the habit. That's the oldest known instance of copulation on Earth.
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