Prehistoric fish pioneered sex








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Life on Earth has come a long way from the first simple microscopic organisms that sprang forth in the primordial soup billions of years ago to the great variety of plants and animals on the planet today. News Daily Headlines Receive our lunchtime briefing straight to your inbox. Of course, the implications of these findings extend beyond ichthyosaurs. Islamic State families surrender in Syria with anger and defiance. This fossilized tissue raised the question of how much fine detail the specimen might preserve, down to the molecular level. And now, an in-depth study of an exceptional ichthyosaur fossil has added new points of similarity between the marine reptiles of the past and the cetaceans of our modern seas, including a fatty, insulating layer of tissue called blubber.

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Dna Sequencing Reveals That Coelacanths Weren

But just as species have changed over time, so too has the way they make their babies. The ground-breaking discovery suggests that external fertilisation evolved from internal fertilisation through sexual intercourse — and not the other way around. This fossilized tissue raised the question of how much fine detail the specimen might preserve, down to the molecular level. The Mystery of Lake Malawi. Subscribe Top Menu Current Issue. More From The Irish Examiner.

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Scientists discover origins of sex

For the sake of clarifying what "square-dance style" intercourse means, the gracious folks at Flinders University put together a visualization of what two antiarch placoderms having sex would look like. The hagfish is a slime-emitting ocean-dweller that's remained unchanged for million years--and it shows. The Mystery of Lake Malawi. Life on Earth has come a long way from the first simple microscopic organisms that sprang forth in the primordial soup billions of years ago to the great variety of plants and animals on the planet today. In a landmark discovery on the history of sexual reproduction described Sunday in the journal Nature , scientists have uncovered the first form of copulation , and in the most unlikely of animals - a now-extinct type of armored fish, called antiarch placoderms. But Long says humans and other copulating animals might still have antiarch placoderms to thank for paving the way. Although some contemporaneous species, like sharks, continue to thrive millions years later, placoderms were driven to extinction after a run of about 50 million years.

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Description: Long isn't sure why that switch occurred , but says "it could be a change in environment or a special adaptation that happened at the time. Many marine mammals, leatherback sea turtles, and penguins have similar deposits, Kelley says, and the blubber is tied to elevated metabolism and body temperatures to keep the animal warmer than the surrounding environment. But Long says humans and other copulating animals might still have antiarch placoderms to thank for paving the way. Paleontologist John Long and his team from Flinders University were studying fossils of placoderms, who inhabited ancient lakes in Scotland around million years ago, when they made a surprising find. Over the eons that followed, internal fertilization would reemerge as the prefered mating methodology, especially as animals began to venture out of water and onto land where spawning wouldn't work so well. And now, an in-depth study of an exceptional ichthyosaur fossil has added new points of similarity between the marine reptiles of the past and the cetaceans of our modern seas, including a fatty, insulating layer of tissue called blubber. Science Age of Humans. Those were the lady antiarchs. The evidence that Stenopterygius had blubber is a further confirmation that ichthyosaurs maintained elevated body temperatures and were extremely active. While paleontologists used to ask if fossil preservation could go down to the molecular level, now experts are using a variety of techniques to identify and analyze these microscopic clues.
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